{"id":4836,"date":"2020-11-20T23:13:42","date_gmt":"2020-11-20T15:13:42","guid":{"rendered":"https:\/\/damogame.cn\/wordpress\/?p=4836"},"modified":"2020-11-20T23:13:42","modified_gmt":"2020-11-20T15:13:42","slug":"%e5%86%85%e5%ad%98%e8%ae%bf%e9%97%ae%e6%a8%a1%e5%9e%8b","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/4836","title":{"rendered":"\u5185\u5b58\u8bbf\u95ee\u6a21\u578b"},"content":{"rendered":"<p><a href=\"https:\/\/gitee.com\/Kenneth-Lee-2012\/know_modern_server_from_kunpeng920_pub\/blob\/pub\/source\/%E8%AE%A1%E7%AE%97%E5%AD%90%E7%B3%BB%E7%BB%9F\/%E5%86%85%E5%AD%98%E8%AE%BF%E9%97%AE%E6%A8%A1%E5%9E%8B.rst\">\u539f\u6587\u5730\u5740<\/a><\/p>\n<p>&nbsp;<\/p>\n<p>\u6211\u4eec\u8fd9\u91cc\u8bf4\u7684\u5185\u5b58\u8bbf\u95ee\u6a21\u578b\u4e3b\u8981\u5bf9\u5e94\u82f1\u6587\u7684Memory Consistency Model\u3002\u6211\u4eec\u4e3b\u8981\u5173\u5fc3\u7684 \u662f\u6574\u4e2a\u7cfb\u7edf\u6240\u6709\u7684\u5185\u5b58\u4f7f\u7528\u5bf9\u8c61\u5bf9\u5185\u5b58\u7684\u8bbf\u95ee\u80fd\u5426\u6709\u5171\u540c\u7684\u63a7\u5236\u8bed\u4e49\u548c\u8ba4\u77e5\u3002<\/p>\n<p><a name=\"id2\"><\/a><\/p>\n<h2><a id=\"\u5185\u5b58\u8bbf\u95ee\u7684\u7684\u539f\u5b50\u5316\u884c\u4e3a\" class=\"anchor\" href=\"https:\/\/gitee.com\/Kenneth-Lee-2012\/know_modern_server_from_kunpeng920_pub\/blob\/pub\/source\/%E8%AE%A1%E7%AE%97%E5%AD%90%E7%B3%BB%E7%BB%9F\/%E5%86%85%E5%AD%98%E8%AE%BF%E9%97%AE%E6%A8%A1%E5%9E%8B.rst#%E5%86%85%E5%AD%98%E8%AE%BF%E9%97%AE%E7%9A%84%E7%9A%84%E5%8E%9F%E5%AD%90%E5%8C%96%E8%A1%8C%E4%B8%BA\"><\/a>\u5185\u5b58\u8bbf\u95ee\u7684\u7684\u539f\u5b50\u5316\u884c\u4e3a<\/h2>\n<p>\u4e00\u6761\u72ec\u7acb\u7684\u6307\u4ee4\uff0c\u4ece\u5199\u6307\u4ee4\u7684\u4eba\u770b\u6765\uff0c\u8fd9\u662f\u539f\u5b50\u7684\uff0c\u4f46\u5728CPU\u6267\u884c\u7684\u65f6\u5019\uff0c\u5448\u73b0\u4e3a\u4e00\u7ec4\u590d \u6742\u7684\u5fae\u67b6\u6784\u884c\u4e3a\uff0c\u6240\u4ee5\uff0c\u5f53\u6211\u4eec\u4eceCPU\u4e0a\u53d1\u51fa\u4e00\u6761\u6307\u4ee4\u7684\u65f6\u5019\uff0c\u7a0b\u5e8f\u5458\u4e0d\u80fd\u7b80\u5355\u5047\u8bbe\u8fd9\u4e2a \u6307\u4ee4\u4ece\u5176\u4ed6CPU\u3001\u52a0\u901f\u5668\u6216\u8005\u5176\u4ed6\u8bbe\u5907\u4e0a\u770b\u5230\u4e5f\u662f\u4e00\u6837\u7684\u3002<\/p>\n<p>\u672c\u5c0f\u8282\u6211\u4eec\u770b\u770b\u9cb2\u9e4f\u4e0a\uff08\u5c31\u8fd9\u4e2a\u95ee\u9898\u6765\u8bf4\uff0c\u5176\u5b9e\u4e3b\u8981\u662fARMv8\u7684\u67b6\u6784\u5b9a\u4e49\u4e0a\uff0c\u4f46\u9cb2\u9e4f920\u82af \u7247\u5185\u90e8\u4e0d\u4f46\u5305\u542b\u6709CPU\uff0c\u6240\u4ee5\u4e0d\u89c1\u5f97\u4f1a\u5b8c\u5168\u91cd\u5408\uff0c\u4f46\u7531\u4e8e\u5176\u4ed6\u5904\u7406\u5355\u5143\u4e5f\u9700\u8981\u7ef4\u6301CPU\u7684\u8bed \u4e49\uff0c\u6240\u4ee5\u57fa\u672c\u4e0a\u662f\u91cd\u5408\u7684\uff09\u662f\u5982\u4f55\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u7684\u3002<\/p>\n<p>\u4f5c\u4e3aRISC\u6307\u4ee4\u96c6\uff0cARMv8\u7684\u8bbf\u5b58\u6307\u4ee4\u548c\u8ba1\u7b97\u6307\u4ee4\u662f\u660e\u786e\u5206\u5f00\u7684\u3002\u7a0b\u5e8f\u5458\u5f88\u5bb9\u6613\u533a\u5206\u8fd9\u4e9b\u6307 \u4ee4\u7684\u884c\u4e3a\uff0c\u8fd9\u4e9b\u6307\u4ee4\u8981\u4e0d\u4ece\u5185\u5b58\u4e2d\u8bfb\u5199\u6570\u636e\uff0c\u8981\u4e0d\u57fa\u4e8e\u5bc4\u5b58\u5668\u7684\u6570\u636e\u8fdb\u884c\u5185\u90e8\u7684\u8fd0\u7b97\u3002\u4e0d \u4f1a\u51fa\u73b0\u4e00\u8fb9\u8ba1\u7b97\uff0c\u4e00\u8fb9\u8bbf\u95ee\u5185\u5b58\u7684\u884c\u4e3a\u3002<\/p>\n<div>\n<div>RISC<\/div>\n<\/div>\n<div>\n<div>Reduced Instruction Set Computer\uff0c\u7cbe\u7b80\u6307\u4ee4\u96c6\u8ba1\u7b97\u673a\u3002<\/div>\n<div>\u8fd9\u662f\u4e00\u79cd\u901a\u7528CPU\u6307\u4ee4\u8bbe\u8ba1\u7b56\u7565\uff0c\u539f\u59cb\u7684\u542b\u4e49\u662f\u7b80\u5316\u6307\u4ee4\u96c6\u7684\u529f\u80fd\u3002<\/div>\n<div>\u8ba9\u6bcf\u4e2a\u6307\u4ee4\u5b8c\u6210\u4e00\u4e2a\u72ec\u7acb\u7684\u529f\u80fd\uff0c\u800c\u4e0d\u4f1a\u4ea7\u751f\u6267\u884c\u4e00\u4e2a\u6307\u4ee4\uff0c<\/div>\n<div>CPU\u5185\u90e8\u8981\u53cd\u590d\u8c03\u5ea6\u591a\u4e2a\u786c\u4ef6\u591a\u6b65\u5b8c\u6210\u8fd9\u4e2a\u529f\u80fd\u7684\u60c5\u51b5\u3002<\/div>\n<div>\u8fd9\u79cd\u8bbe\u8ba1\u5bf9\u4e8e\u6d41\u6c34\u7ebf\u5e03\u7f6e\uff0c\u6027\u80fd\u4f18\u5316\uff0c\u90fd\u6709\u66f4\u597d\u7684\u9884\u671f\u6027\uff0c<\/div>\n<div>\u5df2\u7ecf\u5448\u73b0\u73b0\u4ee3CPU\u8bbe\u8ba1\u7684\u4e3b\u6d41\uff0c\u5373\u4f7f\u5728\u90e8\u5206\u8868\u9762\u6307\u4ee4\u5448\u73b0\u4e3a\u975eRISC<\/div>\n<div>\u884c\u4e3a\u7684\u5904\u7406\u5668\u4e2d\uff0c\u5185\u90e8\u5b9e\u73b0\u4e5f\u662f\u6309RISC\u7406\u5ff5\u8bbe\u8ba1\u7684\uff0c\u53ea\u662f\u628a\u4e00\u4e2a<\/div>\n<\/div>\n<div>\n<div>\u590d\u6742\u7684\u6307\u4ee4\u8bf7\u6c42\u7ffb\u8bd1\u4e3a\u591a\u4e2aRISC\u5f62\u5f0f\u7684\u6307\u4ee4\u53d1\u9001\u800c\u5df2\u3002<\/div>\n<\/div>\n<p>\u6b63\u5982\u6211\u4eec\u5728\u4ecb\u7ecd\u6cf0\u5c71\u6838\u7684\u5185\u90e8\u7ed3\u6784\u65f6\u63d0\u5230\u7684\u90a3\u6837\u3002\u5728\u6267\u884c\u8fd9\u4e9b\u6307\u4ee4\u7684\u65f6\u5019\uff0cCPU\u53ef\u80fd\u4f1a\u8fdb \u884c\u9884\u6d4b\u6267\u884c\uff0c\u8bbf\u95ee\u5185\u5b58\u4f1a\u4ea7\u751fCache\u5408\u5e76\uff0c\u8fd9\u4e2a\u4f18\u5316\u5728\u6bcf\u4ee3\u7684\u786c\u4ef6\u4e2d\u90fd\u4f1a\u8fdb\u884c\u4f18\u5316\u3002\u6240\u4ee5 \u5bf9\u4e8e\u8f6f\u4ef6\u5de5\u7a0b\u5e08\uff0c\u6211\u4eec\u5176\u5b9e\u66f4\u5173\u5fc3\u7684\u662f\u5e95\u5c42\u5fae\u67b6\u6784\u5728\u6307\u4ee4\u4e0a\u7684\u201c\u627f\u8bfa\u201d\u3002\u6211\u4eec\u4e0d\u80fd\u57fa\u4e8e\u786c\u4ef6 \u505a\u6210\u4ec0\u4e48\u6837\u6765\u7f16\u7a0b\u3002\u800c\u5bf9\u4e8e\u9cb2\u9e4f920\uff0c\u8fd9\u4e2a\u627f\u8bfa\u5c31\u662fARMv8\u6784\u67b6\u5b9a\u4e49\u3002<\/p>\n<p>\u5728ARMv8\u7684\u67b6\u6784\u5b9a\u4e49\u4e2d\uff0c\u6240\u6709\u5355\u5bc4\u5b58\u5668\uff0c\u800c\u4e14\u548c\u5bc4\u5b58\u5668\u5927\u5c0f\u5bf9\u9f50\u7684\u5730\u5740\u8bbf\u95ee\u6307\u4ee4\uff0c\u90fd\u4fdd\u8bc1 \u662f\u539f\u5b50\u7684\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u4f60\u5728\u4e00\u4e2aCPU\u91cc\u53d1\u51fa\u8fd9\u6837\u7684\u6307\u4ee4\u53bb\u4fee\u6539\u5185\u5b58\uff0c\u5176\u4ed6\u7684CPU\u6216\u8005\u52a0\u901f\u5668 \uff0c\u5fc5\u7136\u6216\u8005\u770b\u5230\u8fd9\u4e2a\u6307\u4ee4\u751f\u6548\u524d\u7684\u60c5\u51b5\uff0c\u6216\u8005\u770b\u5230\u751f\u6548\u540e\u7684\u60c5\u51b5\uff0c\u4e0d\u4f1a\u51fa\u73b0\u4fee\u6539\u4e86\u4e00\u534a\u7684 \u60c5\u51b5\u3002<\/p>\n<p>\u8fd9\u4e00\u70b9\u4fdd\u8bc1\u4e86\u591a\u4e2aCPU\u540c\u65f6\u8bbf\u95ee\u5185\u5b58\u7684\u65f6\u5019\u7ed3\u679c\u662f\u6709\u529e\u6cd5\u9884\u671f\u7684\uff0c\u5426\u5219\u591a\u6838\u901a\u8baf\u5c31\u6ca1\u6cd5\u76f4 \u63a5\u57fa\u4e8e\u5185\u5b58\u505a\u4e86\u3002<\/p>\n<p>\u5176\u4ed6\u6bcf\u4e2a\u5177\u4f53\u6307\u4ee4\u7684\u5185\u5b58\u884c\u4e3aARMv8\u67b6\u6784\u8bbe\u8ba1\u4e2d\u6709\u5177\u4f53\u7684\u5b9a\u4e49\uff0c\u6211\u4eec\u8fd9\u91cc\u4e0d\u662f\u8981\u7ffb\u8bd1ARMv8 \u67b6\u6784\u624b\u518c\uff0c\u6240\u4ee5\u6211\u4eec\u8fd9\u91cc\u4e0d\u6df1\u5165\u8fdb\u53bb\u3002<\/p>\n<p>\u6211\u4eec\u770b\u770b\u5176\u4ed6\u7684\u539f\u5b50\u9700\u6c42\u5728\u8fd9\u4e2a\u5e73\u53f0\u662f\u600e\u4e48\u5b9e\u73b0\u7684\u3002\u9996\u5148\u662fCAS\u3002CAS\u662fCompare-And-Swap \u7684\u7b80\u79f0\u3002\u8fd9\u662f\u8f6f\u4ef6\u5b9e\u73b0\u9501\u7684\u7684\u57fa\u672c\u65b9\u6cd5\uff1a\u5728\u5185\u5b58\u4e0a\u653e\u4e00\u4e2a\u53d8\u91cfv\uff0c\u6bcf\u4e2aCPU\u4e0d\u65ad\u53bb\u8bfb\u8fd9\u4e2a\u53d8 \u91cf\uff0c\u5982\u679c\u5b83\u662fa\u7684\u65f6\u5019\uff0c\u8868\u793a\u67d0\u79cd\u8d44\u6e90\uff08\u6bd4\u5982\u5176\u4ed6\u5185\u5b58\u53d8\u91cf\uff09\uff0c\u7acb\u5373\u628a\u5b83\u8bbe\u7f6e\u4e3ab\uff0c\u4f7f\u7528\u90a3 \u79cd\u8d44\u6e90\uff0c\u7528\u5b8c\u540e\uff0c\u518d\u628a\u5b83\u8bbe\u7f6e\u4e3aa\uff0c\u8ba9\u5176\u4ed6CPU\u53ef\u4ee5\u4f7f\u7528\u5b83\u3002<\/p>\n<p>\u8fd9\u4e2a\u903b\u8f91\u5f88\u7b80\u5355\uff0c\u4f46\u9700\u8981\u4fdd\u8bc1\u8bfb\u5230\u5b83\u662fa\u548c\u628a\u5b83\u8bbe\u7f6e\u4e3ab\u8fd9\u4e24\u4e2a\u52a8\u4f5c\u662f\u539f\u5b50\u7684\uff0c\u5426\u5219\u8fd9\u4e2a\u903b \u8f91\u5c31\u4e0d\u6210\u7acb\u4e86\u3002\u5b8c\u6210\u8fd9\u6837\u539f\u5b50\u6307\u4ee4\u5c31\u79f0\u4e3aCAS\u3002<\/p>\n<p>ARMv8\u5b9a\u4e49\u4e86\u4e00\u7ec4\u5305\u62ecCAS\u6307\u4ee4\u5728\u5185\u7684\u539f\u5b50\u6307\u4ee4\uff1a<\/p>\n<ul>\n<li>CAS Compare-And-Set\uff0c\u6709\u4e0d\u540c\u5b57\u957f\u7684\u7248\u672c\uff08\u4e0b\u540c\uff09<\/li>\n<li>LDADD\/STADD Load\/Store-and-Add<\/li>\n<li>LDCLR\/STCLR Load\/Store-and-Clear<\/li>\n<li>LDEOR\/STEOR Load\/Store-and-EclusiveOR<\/li>\n<li>LDSET\/STSET Load\/Store-and-Set<\/li>\n<li>LDMAX\/STMAX Load\/Store-and-\u53d6\u6700\u5927\u503c\uff0c\u5206\u4e0d\u540c\u5b57\u957f\u548c\u6709\u7b26\u53f7\u6570\u548c\u65e0\u7b26\u53f7\u6570\u7248\u672c\uff08\u4e0b\u540c\uff09<\/li>\n<li>LDMIN\/STMIN Load\/Store-and-\u53d6\u6700\u5c0f\u503c<\/li>\n<\/ul>\n<p>\u6240\u6709\u8fd9\u4e9b\u6307\u4ee4\u90fd\u662f\u5728\u5185\u5b58\u64cd\u4f5c\u4e0a\u53e0\u52a0\u4e00\u4e2a\u8fd0\u7b97\u4ee5\u5b9e\u73b0\u591a\u6838\u4e4b\u95f4\u6570\u636e\u66f4\u65b0\uff0c\u8fd9\u8bf4\u8d77\u6765\u8fdd\u80cc\u6211 \u4eec\u524d\u9762\u63d0\u5230\u7684RISC\u8bbe\u8ba1\u539f\u5219\uff0c\u4f46\u8fd9\u5c31\u662f\u8fd9\u4e2a\u4ea7\u4e1a\u7684\u7279\u70b9\uff0c\u6c38\u8fdc\u90fd\u662f\u4e2a\u5ea6\u7684\u95ee\u9898\u3002<\/p>\n<p>\u539f\u5b50\u6307\u4ee4\u5728\u8f6f\u4ef6\u4e0a\u770b\u6765\u903b\u8f91\u5e76\u4e0d\u590d\u6742\uff0c\u4f46\u5728\u5fae\u67b6\u6784\u4e0a\u770b\uff0c\u6210\u672c\u662f\u5f88\u9ad8\u7684\u3002\u5982\u679c\u6211\u4eec\u628aCPU \u548c\u5185\u5b58\u90fd\u770b\u505a\u662f\u603b\u7ebf\u4e0a\u7684\u4e00\u4e2a\u4e2a\u72ec\u7acb\u7684\u5b9e\u4f53\uff0c\u6709\u4e00\u4e2aCPU\u8981\u505aCAS\u6307\u4ee4\uff0c\u8fd9\u4e2aCPU\u9700\u8981\u5148\u4ece \u5185\u5b58\u4e2d\u8bfb\u4e00\u4e2a\u503c\uff0c\u540c\u65f6\u8981\u5728\u5185\u5b58\u63a7\u5236\u5668\u4e0a\u8bbe\u7f6e\u4e00\u4e2a\u6807\u5fd7\uff0c\u4fdd\u8bc1\u5176\u4ed6CPU\u5199\u4e0d\u8fdb\u53bb\uff0c\u7b49\u5b83\u6bd4 \u8f83\u5b8c\u4e86\uff0c\u7136\u540e\u518d\u51b3\u5b9a\u5199\u4e00\u4e2a\u503c\u56de\u53bb\uff0c\u624d\u4f1a\u8ba9\u5176\u4ed6CPU\u5199\u5165\u3002<\/p>\n<p>\u4e0d\u540c\u5fae\u67b6\u6784\u5b9e\u73b0\u6709\u4e0d\u540c\u65b9\u6cd5\u5bf9\u884c\u4e3a\u8fdb\u884c\u4f18\u5316\uff0c\u5728\u9cb2\u9e4f920\u4e0a\uff0c\u539f\u5b50\u6307\u4ee4\u7684\u8bf7\u6c42\u9700\u8981\u5728 L3Cache\u4e0a\u8fdb\u884c\u6392\u961f\uff0c\u4fdd\u8bc1\u5728\u539f\u5b50\u64cd\u4f5c\u7684\u591a\u4e2a\u52a8\u4f5c\u4e4b\u95f4\u80fd\u7ef4\u6301\u539f\u5b50\u6307\u4ee4\u8981\u6c42\u7684\u8bed\u4e49\u3002\u8fd9\u4e2a \u6392\u961f\u672c\u8eab\u4e5f\u6709\u6210\u672c\u3002\u6240\u4ee5\u6ca1\u6709\u539f\u5b50\u9700\u8981\u5c31\u4e0d\u8981\u8f7b\u6613\u7528\u539f\u5b50\u53d8\u91cf\uff0c\u8fd9\u5176\u5b9e\u662f\u6709\u6210\u672c\u7684\u3002<\/p>\n<blockquote>\n<div><img decoding=\"async\" src=\"https:\/\/gitee.com\/Kenneth-Lee-2012\/know_modern_server_from_kunpeng920_pub\/raw\/pub\/source\/%E8%AE%A1%E7%AE%97%E5%AD%90%E7%B3%BB%E7%BB%9F\/atomic_inst_arch.svg\" \/><\/div>\n<\/blockquote>\n<p>\u539f\u5b50\u6307\u4ee4\u5728\u9047\u5230\u51b2\u7a81\u7684\u65f6\u5019\uff0c\u4f1a\u76f4\u63a5\u963b\u4f4fCPU\u7684\u6267\u884c\u3002\u8fd9\u4e2a\u5bf9\u4e8e\u5f88\u591aCPU\u7684\u9501\u884c\u4e3a\u662f\u6709\u5bb3\u7684 \uff0c\u6240\u4ee5ARMv8\u8fd8\u6709\u4e00\u5957exclusive\u6307\u4ee4\uff1a<\/p>\n<ul>\n<li>LDEX Load-Exclusive\uff0c\u6709\u4e0d\u540c\u5b57\u957f\u7684\u7248\u672c\uff08\u4e0b\u540c\uff09<\/li>\n<li>STEX Store-Exclusive<\/li>\n<li>LDAEX Load-Exclusive-Acquire<\/li>\n<li>STLEX Store-Exclusive-Release<\/li>\n<\/ul>\n<p>\u8fd9\u4e2a\u65b9\u6848\u628a\u90e8\u5206\u81ea\u7531\u5ea6\u8fd8\u7ed9\u8f6f\u4ef6\uff1aLDEX\u8bfb\u4e00\u4e2a\u5185\u5b58\uff0c\u540c\u65f6\u5728\u8fd9\u4e2a\u5185\u5b58\u5730\u5740\u4e0a\u6253\u4e0a\u4e00\u4e2a\u6807\u8bb0 \uff0cSTEX\u8d1f\u8d23\u5bf9\u8fd9\u4e2a\u5730\u5740\u5199\u5165\u4e00\u4e2a\u503c\uff0c\u5982\u679c\u8fd9\u8fd9\u79cd\u6709\u5176\u4ed6CPU\u4fee\u6539\u8fc7\u8fd9\u4e2a\u503c\uff0c\u8fd9\u4e2a\u5199\u5165\u4f1a\u5931 \u8d25\u672cCPU\u53ef\u4ee5\u91cd\u65b0\u505a\u8fd9\u4e2aLDEX\u3002\u8fd9\u4e2a\u65b9\u6848\u4e0d\u9700\u8981CPU\u4f5c\u7b49\u5f85\uff0cCPU\u5982\u679c\u5199\u4e0d\u6210\u529f\uff0c\u53ef\u4ee5\u5148\u53bb \u505a\u522b\u7684\u64cd\u4f5c\uff0c\u6839\u636e\u7b56\u7565\u91cd\u8bd5\u3002\u8fd9\u5bf9\u4e8e\u5171\u4eab\u7684\u6838\u7684\u6570\u91cf\u975e\u5e38\u591a\u7684\u65f6\u5019\uff0c\u6536\u76ca\u4f1a\u5f88\u5927\u3002<\/p>\n<div>\n<div>\u6ce8\uff1a\u4f46Linux Kernel\u5728\u9010\u6b65\u653e\u5f03exclusive\u6307\u4ee4\uff0c\u8fd9\u5957\u6307\u4ee4\u81f3\u5c11\u5728Linux<\/div>\n<\/div>\n<div>Kernel\u662f\u63a8\u5e7f\u5f97\u4e0d\u6210\u529f\u7684\u3002<\/div>\n<p>\u8fd9\u5bf9\u6307\u4ee4\u7684Acquire\u548cRelease\u7248\u672c\u53ea\u662f\u589e\u52a0\u4e86\u5185\u5b58\u987a\u5e8f\u5f3a\u5236\uff0c\u8fd9\u4e2a\u6211\u4eec\u5728\u8bb2\u5185\u5b58\u987a\u5e8f\u6a21\u578b \u7684\u65f6\u5019\u8ba8\u8bba\u3002<\/p>\n<p>\u548c\u539f\u5b50\u6307\u4ee4\u628a\u540c\u6b65\u884c\u4e3a\u63a8\u5230L3 Cache\u4e0d\u540c\uff0c\u5728\u9cb2\u9e4f920\u4e0aExclusive\u6307\u4ee4\u7684\u540c\u6b65\u662f\u5728\u9760\u8fd1 CPU\u7684Cache\u4e0a\u505a\u7684\uff0cLDA\u5728\u672c\u5730\u7684Cacheline\u4e0a\u8bbe\u7f6e\u4e86\u4e00\u4e2a\u6807\u8bb0\uff0c\u5176\u4ed6CPU\u5982\u679c\u66f4\u65b0\u4e86\u8fd9\u4e2a \u6570\u636e\uff0c\u4f1a\u628a\u8fd9\u4e2aCacheline\u7f6e\u4e3a\u65e0\u6548\uff0c\u8fd9\u65f6\u518d\u505aSTL\u5c31\u53ef\u4ee5\u77e5\u9053\u6570\u636e\u66f4\u6539\u8fc7\u4e86\u3002\u4f46Cache\u540c \u6b65\u672c\u8eab\u4e5f\u6709\u6210\u672c\uff08\u5171\u4eab\u8fd9\u4e2a\u6570\u636e\u7684CPU\u8d8a\u591a\u6210\u672c\u8d8a\u9ad8\uff09\uff0c\u6240\u4ee5\u8fd9\u4e5f\u662f\u4e2a\u6743\u8861\u7684\u95ee\u9898\uff0c\u901a\u5e38 \u6211\u4eec\u7528\u540e\u8005\u505a\u9501\u64cd\u4f5c\uff0c\u800c\u7528\u524d\u8005\u505a\u539f\u5b50\u53d8\u91cf\u4e00\u7c7b\u7684\u529f\u80fd\u3002<\/p>\n<blockquote>\n<div><img decoding=\"async\" src=\"https:\/\/gitee.com\/Kenneth-Lee-2012\/know_modern_server_from_kunpeng920_pub\/raw\/pub\/source\/%E8%AE%A1%E7%AE%97%E5%AD%90%E7%B3%BB%E7%BB%9F\/exclusive_inst_arch.svg\" \/><\/div>\n<\/blockquote>\n<p>\u4e00\u822c\u5e94\u7528\u7684\u5de5\u7a0b\uff0c\u4e00\u822c\u6bd4\u8f83\u597d\u7684\u5b9e\u8df5\u662f\u7528\u5bf9\u5e94\u8bed\u8a00\u7684\u4e00\u822c\u8bed\u4e49\u7f16\u7a0b\u6bd4\u8f83\u597d\uff0c\u628a\u8fd9\u4e2a\u4f18\u5316\u5de5 \u4f5c\u7559\u7ed9\u82af\u7247\u548c\u5e95\u5c42\u8f6f\u4ef6\u7684\u4f18\u5316\u8005\u662f\u4e2a\u66f4\u597d\u7684\u914d\u5408\u7b56\u7565\u3002<\/p>\n<p><a name=\"cachecache-coherency\"><\/a><\/p>\n<h2><a id=\"\u5185\u5b58cache\u548ccache-coherency\u8bbe\u8ba1\" class=\"anchor\" href=\"https:\/\/gitee.com\/Kenneth-Lee-2012\/know_modern_server_from_kunpeng920_pub\/blob\/pub\/source\/%E8%AE%A1%E7%AE%97%E5%AD%90%E7%B3%BB%E7%BB%9F\/%E5%86%85%E5%AD%98%E8%AE%BF%E9%97%AE%E6%A8%A1%E5%9E%8B.rst#%E5%86%85%E5%AD%98cache%E5%92%8Ccache-coherency%E8%AE%BE%E8%AE%A1\"><\/a>\u5185\u5b58Cache\u548cCache Coherency\u8bbe\u8ba1<\/h2>\n<p>\u76f8\u5bf9CPU\u7684\u8ba1\u7b97\u5355\u4f4d\uff0c\u4e00\u6b21\u65f6\u949f\u8df3\u53d8\uff0c\u6216\u8005\u4e00\u822c\u8bf4\u4e00\u4e2aCycle\uff0c\u5185\u5b58\u7684\u901f\u5ea6\u975e\u5e38\u6162\uff0c\u5728\u914d\u7f6e xxxx\u4e3b\u9891\u7684DDR4\u4e0a\uff0c\u4e00\u4e2a\u5185\u5b58\u8bbf\u95ee\u64cd\u4f5c\u9700\u8981xxx\u4e2aCycle\uff08\u5f85\u786e\u5b9a\uff0c\u4f46\u4e00\u822c\u6211\u4f1a\u8ba4\u4e3a\u662f200 \u4e2aCycle\u5de6\u53f3\uff09\u3002<\/p>\n<p>\u8fd9\u65f6\u5c31\u4f1a\u9009\u62e9\u4f7f\u7528Cache\u3002Cache\u662f\u66f4\u5feb\u3001\u66f4\u5c0f\u3001\u66f4\u9760\u8fd1CPU\u7684\u5b58\u50a8\u5355\u5143\u3002Cache\u7684\u5b58\u5728\u548c\u8bbe \u8ba1\u4e0a\u4e0d\u65ad\u7684\u6539\u8fdb\u548c\u53d8\u5316\uff0c\u63a7\u5236\u8981\u7d20\u90fd\u662f\u5b83\u7684\u8fd9\u4e09\u4e2a\u7279\u5f81\uff1a<\/p>\n<ul>\n<li>\u66f4\u5feb\uff1a\u66f4\u5feb\u800c\u6ca1\u6709\u53d6\u4ee3DDR\u5185\u5b58\uff0c\u663e\u800c\u6613\u89c1\uff0c\u56e0\u4e3a\u6210\u672c\u9ad8<\/li>\n<li>\u66f4\u5c0f\uff1a\u540c\u4e0a<\/li>\n<li>\u66f4\u9760\u8fd1CPU\uff1a\u5373\u4f7f\u6ca1\u6709\u524d\u9762\u8fd9\u4e2a\u6210\u672c\u7684\u95ee\u9898\uff0c\u5927\u91cf\u7684CPU\u9700\u8981\u8bbf\u95ee\u76f8\u540c\u7684\u5730\u5740\uff0c\u4e5f\u9700\u8981\u6392 \u961f\uff0cCache\u4ecd\u53ef\u4ee5\u5e26\u6765\u4f18\u52bf\u3002\n<div>\n<div>\u6839\u636e\u00a0<a href=\"https:\/\/gitee.com\/Kenneth-Lee-2012\/know_modern_server_from_kunpeng920_pub\/blob\/pub\/source\/%E8%AE%A1%E7%AE%97%E5%AD%90%E7%B3%BB%E7%BB%9F\/%E5%86%85%E5%AD%98%E8%AE%BF%E9%97%AE%E6%A8%A1%E5%9E%8B.rst#id4\">[1]<\/a>\u00a0\u7684\u6570\u636e\uff0c2012\u5e74SRAM\u7684\u5355\u6b21\u8bbf\u95ee\u65f6\u95f4\u662f0.5-2.5ns\uff0c<\/div>\n<div>\u6bcfGB\u7684\u4ef7\u683c\u662f500-1000\u7f8e\u5143\u3002\u800cDDR\u7684\u5355\u6b21\u8bbf\u95ee\u65f6\u95f4\u662f60-70ns\uff0c<\/div>\n<div>\u6bcfGB\u7684\u67b6\u6784\u662f10-20\u7f8e\u5143\u3002<\/div>\n<\/div>\n<\/li>\n<\/ul>\n<table frame=\"void\" rules=\"none\">\n<tbody valign=\"top\">\n<tr>\n<td><a href=\"https:\/\/gitee.com\/Kenneth-Lee-2012\/know_modern_server_from_kunpeng920_pub\/blob\/pub\/source\/%E8%AE%A1%E7%AE%97%E5%AD%90%E7%B3%BB%E7%BB%9F\/%E5%86%85%E5%AD%98%E8%AE%BF%E9%97%AE%E6%A8%A1%E5%9E%8B.rst#id3\">[1]<\/a><\/td>\n<td>Computer Organization and Design: RISC-V Edition<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u9cb2\u9e4f920\u7684Cache\u5206\u8fd1CPU Cache(L1\u548cL2\uff09\u548c\u8fdcCPU Cache\uff08L3\uff09\uff0c\u793a\u610f\u5982\u4e0b\u56fe\uff1a<\/p>\n<blockquote>\n<div><img decoding=\"async\" src=\"https:\/\/gitee.com\/Kenneth-Lee-2012\/know_modern_server_from_kunpeng920_pub\/raw\/pub\/source\/%E8%AE%A1%E7%AE%97%E5%AD%90%E7%B3%BB%E7%BB%9F\/kp920_cache_arch.svg\" \/><\/div>\n<\/blockquote>\n<p>\u8fd1CPU Cache\u53ef\u4ee5\u4e0d\u8de8\u57df\u7cfb\u7edf\u603b\u7ebf\u8bbf\u95ee\uff0c\u8fdcCPU Cache\u5219\u9700\u8981\u8de8\u8d8a\u603b\u7ebf\u3002\u540e\u8005\u88ab\u5206\u6210\u4e24\u90e8\u5206 \u3002Cache\u5185\u5bb9\u7d22\u5f15\uff08Tag\uff09\u5728CPU\u548c\u52a0\u901f\u5668\u4e00\u4fa7\uff0c\u800c\u5b9e\u9645\u7684\u6570\u636e\u5728\u603b\u7ebf\u7684\u53e6\u4e00\u7aef\u3002<\/p>\n<p><a name=\"cacheline\"><\/a><\/p>\n<h3><a id=\"cacheline\u548c\u5173\u8054\u6027\" class=\"anchor\" href=\"https:\/\/gitee.com\/Kenneth-Lee-2012\/know_modern_server_from_kunpeng920_pub\/blob\/pub\/source\/%E8%AE%A1%E7%AE%97%E5%AD%90%E7%B3%BB%E7%BB%9F\/%E5%86%85%E5%AD%98%E8%AE%BF%E9%97%AE%E6%A8%A1%E5%9E%8B.rst#cacheline%E5%92%8C%E5%85%B3%E8%81%94%E6%80%A7\"><\/a>Cacheline\u548c\u5173\u8054\u6027<\/h3>\n<p>Cache\u6bd4\u76ee\u6807\u7a7a\u95f4\u5c0f\uff0c\u8fd9\u5c31\u9020\u6210\u4e00\u4e2a\u76ee\u6807\u5730\u5740\u6807\u8bc6\u7684\u95ee\u9898\u7684\u4e86\u3002\u5982\u679c\u4e00\u4e2a\u5b57\u957f\u7684\u6570\u636e\u9700\u8981 \u4e00\u4e2a\u5730\u5740\uff0c\u90a3\u4e48\u4e00\u4e2a64\u4f4d\u7684\u6570\u636e\u5c31\u9700\u8981\u4e00\u4e2a64\u4f4d\u7684\u7d22\u5f15\uff08Tag\uff09\uff0c\u7528\u66f4\u5927\u7684\u6570\u636e\u7c92\u5ea6\uff0c\u5bf9 \u5730\u5740\u7684\u8981\u6c42\u5c31\u53ef\u4ee5\u4e0b\u964d\u3002\u8fd9\u4e2a\u7c92\u5ea6\u5c31\u79f0\u4e3aCachenline\u3002\u4e0d\u540c\u5c42\u7ea7\u7684Cacheline\u7684\u957f\u5ea6\u4e0d\u9700 \u8981\u5b8c\u5168\u4e00\u81f4\uff0c\u9cb2\u9e4f920\u7684Cachenline\u957f\u5ea6\uff0c\u53ef\u4ee5\u5728Linux\u53d1\u884c\u7248\u4e0a\u8fd0\u884cgetconf\u547d\u4ee4\u83b7\u5f97\u3002 \u4f46\u5728\u672c\u6587\u5199\u4f5c\u7684\u65f6\u5019\uff0c\u8fd9\u91cc\u53ea\u6709L1 Cache\u7684\u957f\u5ea6\uff0c\u8fd9\u662f\u4e00\u4e2aBug\u3002<\/p>\n<div>\n<div>\u5728Linux\u4e2d\uff0c\u4ece<\/div>\n<\/div>\n<div>\n<div>\/sys\/devices\/system\/cpu\/cpuN\/cache\/index*\/coherency_line_size<\/div>\n<\/div>\n<div>\n<div>\u4e2d\u4e5f\u53ef\u4ee5\u8bfb\u5230Cacheline\u7684\u957f\u5ea6 \uff08todo\uff1a\u8865\u5145\u4e00\u526f\u56fe)<\/div>\n<\/div>\n<p>\u8bfb\u8005\u5982\u679c\u9700\u8981\u53c2\u8003\u6570\u636e\uff0c\u9cb2\u9e4f920\u7684L1\u548cL2 Cacheline\u957f\u5ea6\u662f64\u4e2a\u5b57\u8282\uff0c\u800cL3 Cachenline \u7684\u957f\u5ea6\u662f128\u4e2a\u5b57\u8282\u3002\u8fd9\u4e9b\u503c\u7684\u9009\u62e9\uff0c\u90fd\u662f\u9488\u5bf9\u5e94\u7528\u7684\u6743\u8861\u7684\u7ed3\u679c\uff0c\u5e76\u6ca1\u6709\u786e\u5b9a\u7684\u89c4\u77e9\u3002<\/p>\n<p>\u5173\u8054\u6027\u5219\u662f\u8fdb\u4e00\u6b65\u964d\u4f4e\u5bf9Tag\u7684\u8981\u6c42\uff1a\u5982\u679c\u89c4\u5b9a\u6bcf\u4e2aCacheling\u53ea\u80fd\u5bf9\u5e94\u4e00\u5b9a\u6570\u91cf\u7684\u5730\u5740\uff0c Tag\u7684\u5927\u5c0f\u53ef\u4ee5\u8fdb\u4e00\u6b65\u964d\u4f4e\uff1a<\/p>\n<blockquote>\n<div><img decoding=\"async\" src=\"https:\/\/gitee.com\/Kenneth-Lee-2012\/know_modern_server_from_kunpeng920_pub\/raw\/pub\/source\/%E8%AE%A1%E7%AE%97%E5%AD%90%E7%B3%BB%E7%BB%9F\/cache_addressing.svg\" \/><\/div>\n<\/blockquote>\n<p>\u628aCache\u5206\u6210\u591a\u4e2aWay\uff0c\u591a\u4e2aSet\uff0c\u4e5f\u6709\u52a9\u4e8e\u7b80\u5316\u786c\u4ef6\u7684\u8bbe\u8ba1\u3002<\/p>\n<p>Cacheline\u8fd9\u79cd\u4e1c\u897f\u7684\u5b58\u5728\uff0c\u4e5f\u4f1a\u5bf9\u7a0b\u5e8f\u4ea7\u751f\u8fb9\u7f18\u6548\u5e94\u3002\u6bd4\u5982\u4f60\u5b9a\u4e49\u4e86\u4e24\u4e2a\u72ec\u7acb\u7684\u53d8\u91cf\u7ed9 \u4e24\u4e2aCPU\uff0c\u5982\u679c\u4ed6\u4eec\u9760\u5f97\u592a\u8fd1\uff0c\u6b63\u597d\u843d\u5728\u540c\u4e00\u4e2aCachenline\u4e2d\u4e86\uff0c\u4f60\u4ee5\u4e3a\u8fd9\u4e24\u4e2a\u53d8\u91cf\u6ca1\u6709 \u5171\u4eab\uff0c\u4f46\u603b\u7ebf\u7cfb\u7edf\u4ee5\u4e3a\u4ed6\u4eec\u5171\u4eab\u4e86\uff0c\u4efb\u4f55\u4e00\u4e2aCPU\u66f4\u65b0\u4e86\u81ea\u5df1\u7684\u53d8\u91cf\uff0c\u90fd\u8981\u540c\u6b65\u7ed9\u53e6\u4e00\u8fb9 \u7684CPU\uff0c\u8fd9\u4e2a\u6027\u80fd\u5c31\u4f1a\u6389\u4e0b\u6765\u3002<\/p>\n<p>\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u7684\u65b9\u6cd5\u5f53\u7136\u662f\u4fdd\u8bc1\u4e0d\u540cCPU\u7684\u53d8\u91cf\u72ec\u5360\u5404\u81ea\u7684Cacheline\uff0c\u4f46\u8fd9\u4e2a\u95ee\u9898\u66f4\u503c\u5f97 \u6211\u4eec\u5173\u6ce8\u7684\u95ee\u9898\u662f\uff1a\u4efb\u4f55\u4e00\u79cd\u4ee3\u7406\u90fd\u4f1a\u4ea7\u751f\u8fb9\u9645\u6548\u5e94\uff0c\u6211\u4eec\u4e0d\u8981\u6307\u671b\u62bd\u8c61\u548c\u5c01\u88c5\u53ef\u4ee5\u89e3\u51b3 \u6240\u6709\u95ee\u9898\uff0c\u62bd\u8c61\u548c\u5c01\u88c5\u5728\u6027\u80fd\u9762\u524d\u5e38\u5e38\u662f\u65e0\u6240\u9041\u5f62\u7684\u3002<\/p>\n<p><a name=\"icachedcache\"><\/a><\/p>\n<h3><a id=\"icache\u548cdcache\" class=\"anchor\" href=\"https:\/\/gitee.com\/Kenneth-Lee-2012\/know_modern_server_from_kunpeng920_pub\/blob\/pub\/source\/%E8%AE%A1%E7%AE%97%E5%AD%90%E7%B3%BB%E7%BB%9F\/%E5%86%85%E5%AD%98%E8%AE%BF%E9%97%AE%E6%A8%A1%E5%9E%8B.rst#icache%E5%92%8Cdcache\"><\/a>ICache\u548cDCache<\/h3>\n<p>\u548c\u5f88\u591a\u5176\u4ed6CPU\u7684\u9009\u62e9\u4e00\u6837\uff0c\u9cb2\u9e4f\u7684\u6307\u4ee4\u548c\u6570\u636eCache\uff08\u5206\u522b\u79f0\u4e3aICache\u548cDCache\uff09\u662f\u5206\u79bb \u7684\u3002\u5bf9\u4e8e\u51af\u8bfa\u4f9d\u66fc\u8ba1\u7b97\u673a\u6765\u8bf4\uff0c\u6307\u4ee4\u548c\u6570\u636e\u5176\u5b9e\u90fd\u662f\u6570\u636e\u3002\u6240\u4ee5\u5f88\u591a\u65f6\u5019\u628a\u4e24\u8005\u5206\u79bb\u662f\u6ca1 \u6709\u5fc5\u8981\u7684\uff0c\u4f46\u5728\u6700\u9760\u8fd1CPU\u4e00\u7ea7\uff0c\u628a\u4e24\u8005\u5206\u79bb\u6709\u597d\u5904\uff1a\u5b83\u4eec\u7684\u9884\u53d6\u7b56\u7565\uff0cTag\u65b9\u5f0f\u662f\u4e0d\u540c\u7684 \u3002<\/p>\n<p>\u6bd4\u5982\uff0c\u4e00\u822c\u6570\u636e\u7684Cache\u5730\u5740\u662f\u57fa\u4e8e\u7269\u7406\u5730\u5740\u7684\uff08\u76f8\u540c\u7684\u7269\u7406\u5730\u5740\u53ef\u4ee5\u88ab\u4e0d\u540c\u7684\u865a\u62df\u5730\u5740 \u5171\u4eab\uff09\uff0c\u800cICache\u57fa\u4e8e\u865a\u62df\u5730\u5740\u6ca1\u6709\u597d\u5904\uff0c\u56e0\u4e3aICache\u5728\u89e3\u7801\u7684\u65f6\u5019\u5e76\u4e0d\u77e5\u9053\u7269\u7406\u5730\u5740\uff0c \u7269\u7406\u5730\u5740\u9700\u8981\u7ecf\u8fc7MMU\u8fdb\u884c\u7ffb\u8bd1\u624d\u80fd\u77e5\u9053\u3002<\/p>\n<dl>\n<dt>\u9cb2\u9e4f920 ICache\u58f0\u79f0\u662f\u57fa\u4e8e\u865a\u62df\u5730\u5740\u7684\uff0c\u8fd9\u53ef\u4ee5\u4eceLinux\u5185\u6838\u7684\u542f\u52a8\u65e5\u5fd7\u4e2d\u53ef\u4ee5\u770b\u51fa\u6765\uff1a<\/dt>\n<dd>Detected VIPT I-cache on CPU0 Detected VIPT I-cache on CPU1 Detected VIPT I-cache on CPU2 Detected VIPT I-cache on CPU3 &#8230;<\/dd>\n<\/dl>\n<p>\u8fd9\u91cc\u58f0\u79f0\u6bcf\u4e2aCPU\u662f\u7684ICache\u662fVIPT\u7684\uff0c\u610f\u5473\u7740Linux\u4f1a\u4ee5\u865a\u62df\u5730\u5740\u4e3a\u8003\u91cf\u8fdb\u884c\u76f8\u5e94Cache \u7684\u5237\u65b0\uff0c\u4f46\u8fd9\u5176\u5b9e\u5e76\u975e\u662f\u9cb2\u9e4f920 ICache\u8bbe\u8ba1\u7684\u5168\u90e8\uff0c\u56e0\u4e3a\u5176\u5b9e\u9cb2\u9e4f920\u7684\u53d6\u6307\u90e8\u4ef6\u662f\u540c \u65f6\u53d1\u51fa\u7269\u7406\u5730\u5740\u548c\u865a\u62df\u5730\u5740\u4e24\u4e2a\u8bf7\u6c42\u7684\uff0c\u6839\u636e\u54ea\u4e2a\u5148\u8fd4\u56de\u51b3\u5b9a\u7528\u90a3\u4e2a\u5730\u5740\u3002\u4f46\u5bf9\u64cd\u4f5c\u7cfb\u7edf \u66b4\u9732\u7684\u63a5\u53e3\uff0c\u5b83\u662f\u8ba4\u4e3a\u5b83\u662fVIPT\u7684\u3002<\/p>\n<div>\n<div>VIPT<\/div>\n<\/div>\n<div>\n<div>Virtual Index Physical Tag\uff0c\u8868\u793a\u7528\u865a\u62df\u5730\u5740\u505a\u7d22\u5f15\uff0c<\/div>\n<div>\u800c\u7528\u7269\u7406\u5730\u5740\u505aTag\u5339\u914d\u7684Cache Tag\u8bbe\u8ba1\u65b9\u5f0f\u3002<\/div>\n<\/div>\n<div>\n<div>\u4e0e\u4e4b\u5bf9\u5e94\u7684\u8fd8\u6709VIVT\uff0cPIPT\u7b49\u5176\u4ed6\u7b56\u7565\u3002<\/div>\n<\/div>\n<p>\u6211\u4eec\u8bf4\u660e\u8fd9\u4e00\u70b9\uff0c\u662f\u8981\u8ba9\u8bfb\u8005\u770b\u5230\uff0c\u5176\u5b9e\u5927\u90e8\u5206\u65f6\u5019\u6ca1\u6709\u5fc5\u8981\u9760\u8f6f\u4ef6\u53bb\u54cd\u5e94\u786c\u4ef6\u7684\u591a\u79cd\u53d8 \u5316\uff0c\u56e0\u4e3a\u786c\u4ef6\u4e5f\u5728\u73a9\u5c0f\u806a\u660e\uff0c\u8f6f\u4ef6\u4e5f\u5728\u73a9\u5c0f\u806a\u660e\uff0c\u7cfb\u7edf\u5c31\u4e0d\u518d\u806a\u660e\u4e86\u3002\u6240\u4ee5\u4e0d\u5982\u7b80\u5355\u4e00\u70b9 \u4e25\u683c\u6309\u63a5\u53e3\u548c\u81ea\u5df1\u7684\u76ee\u6807\u6765\u5199\u7a0b\u5e8f\u3002<\/p>\n<p><a name=\"id5\"><\/a><\/p>\n<h3><a id=\"\u5730\u5740\u4ea4\u7ec7\" class=\"anchor\" href=\"https:\/\/gitee.com\/Kenneth-Lee-2012\/know_modern_server_from_kunpeng920_pub\/blob\/pub\/source\/%E8%AE%A1%E7%AE%97%E5%AD%90%E7%B3%BB%E7%BB%9F\/%E5%86%85%E5%AD%98%E8%AE%BF%E9%97%AE%E6%A8%A1%E5%9E%8B.rst#%E5%9C%B0%E5%9D%80%E4%BA%A4%E7%BB%87\"><\/a>\u5730\u5740\u4ea4\u7ec7<\/h3>\n<p>\u5730\u5740\u4ea4\u7ec7\u4e5f\u662f\u4e00\u79cd\u63d0\u5347\u8bbf\u95ee\u5e26\u5bbd\u7684\u6280\u672f\u3002\u6bd4\u5982\u4e00\u4e2a\u7cfb\u7edf\u6709\u4e24\u4e2a\u5185\u5b58\u5355\u5143\uff08\u6bd4\u5982\u4e24\u6761DIMM\u6761 \uff09\uff0c\u90a3\u4e48\u6211\u4eec\u53ef\u4ee5\u6709\u4e24\u79cd\u5e38\u89c1\u7684\u7f16\u5740\u65b9\u6cd5\u3002\u4e00\u79cd\u662f\u76f4\u63a5\u5206\u6bb5\u4f7f\u7528\uff0c\u6bd4\u5982[0,X)\u662f\u7b2c\u4e00\u7247\u5185\u5b58 \u7684\u7a7a\u95f4\uff0c[X, Y]\u662f\u7b2c\u4e8c\u7247\u5185\u5b58\u7684\u7a7a\u95f4\u3002\u8fd9\u79cd\u5982\u679c\u4f60\u8fde\u7eed\u8bbf\u95ee\u4e00\u7247\u5185\u5b58\uff0c\u6bd4\u5982\u505a\u4e00\u4e2amemcpy \uff0c\u8fd9\u4e2a\u8bbf\u95ee\u7684\u5e26\u5bbd\u53d7\u9650\u4e8e\u5230\u5176\u4e2d\u4e00\u4e2a\u5185\u5b58\u5355\u5143\u7684\u5e26\u5bbd\u3002<\/p>\n<p>\u7b2c\u4e8c\u79cd\u65b9\u6cd5\u662f\u7b2c\u4e00\u4e2a\u5730\u5740\u653e\u5728\u7b2c\u4e00\u7247\u5185\u5b58\u4e2d\uff0c\u7b2c\u4e8c\u4e2a\u5730\u5740\u653e\u5728\u7b2c\u4e8c\u7247\u5185\u5b58\u4e2d\uff0c\u7b2c\u4e09\u4e2a\u5730\u5740 \u653e\u5728\u7b2c\u4e00\u7247\u5185\u5b58\u4e2d\uff0c\u7b2c\u56db\u4e2a\u5730\u5740\u5728\u7b2c\u4e8c\u7247\u5185\u5b58\u4e2d\u3002\u8fd9\u6837\u5728\u505a\u8fde\u7eed\u5730\u5740\u8bbf\u95ee\u7684\u65f6\u5019\u5185\u5b58\u7684\u5e26 \u5bbd\u5c31\u53ef\u4ee5\u6269\u5c55\u4e00\u500d\u3002\u8fd9\u79cd\u7f16\u5740\u7684\u65b9\u6cd5\u5c31\u53eb\u5730\u5740\u4ea4\u7ec7\u3002<\/p>\n<p>\u5730\u5740\u4ea4\u7ec7\u53ef\u4ee5\u53d1\u751f\u5728Cache\u4e0a\uff0c\u4e5f\u53ef\u4ee5\u53d1\u751f\u7684\u5185\u5b58\u4e2d\uff0c\u90fd\u662f\u603b\u7ebf\u5730\u5740\u8bbf\u95ee\u7b56\u7565\uff0c\u5728\u9cb2\u9e4f920 \u4e2d\uff0c\u7528\u6237\u53ef\u4ee5\u901a\u8fc7BIOS\u914d\u7f6e\u8bbe\u7f6e\u4e0d\u540c\u7684\u4ea4\u7ec7\u65b9\u6cd5\u3002\u4f46\u5176\u5b9e\u5e76\u6ca1\u6709\u7b56\u7565\uff0c\u6bcf\u79cd\u4ea4\u7ec7\u7b56\u7565\u53ea\u662f \u5bf9\u67d0\u79cd\u5e94\u7528\u5185\u5b58\u8bbf\u95ee\u6a21\u5f0f\u7684\u4e00\u79cd\u59a5\u534f\u3002<\/p>\n<p>\u9cb2\u9e4f920\u652f\u6301\u5982\u4e0b\u5185\u5b58\u6620\u5c04\u6a21\u5f0f\uff1a<\/p>\n<ul>\n<li>Rank-Row-Bank-Col<\/li>\n<li>Rank-Row-Col-Bank-Col<\/li>\n<li>Rank-Row-Rank-Col-Bank-Col<\/li>\n<li>Rank-Row-Bank-Row-Bank-Raw<\/li>\n<li>Rank-Row-Col-Row-Bank-Col<\/li>\n<\/ul>\n<p>\u5b83\u4eec\u5206\u522b\u6839\u636e\u5185\u5b58\u6761\u7684\u4e0d\u540cRank\uff0cRow, Bank\u548cColumne\u8fdb\u884c\u7f16\u5740\uff0c\u5176\u4e2d\u6700\u524d\u9762RRBC\u6a21\u5f0f\u5c31 \u662f\u6ca1\u6709\u4ea4\u7ec7\u7684\u4e00\u822c\u65b9\u5f0f\u3002<\/p>\n<p>\u4e0d\u540c\u7684\u4ea4\u7ec7\u6a21\u5f0f\u662f\u6839\u636e\u4e1a\u52a1\u7684\u9700\u8981\u8fdb\u884c\u7684\u5168\u5c40\u6743\u8861\uff0c\u5bf9\u4e8e\u8f6f\u4ef6\u7a0b\u5e8f\u5458\uff0c\u5927\u90e8\u5206\u65f6\u5019\u6700\u597d\u4e0d \u8981\u53bb\u611f\u77e5\u5185\u5b58\u7684\u4f4d\u7f6e\uff0c\u5de5\u4f5c\u5728numa\u7684\u5c01\u88c5\u4e0a\u624d\u80fd\u4fdd\u8bc1\u8f6f\u4ef6\u7684\u901a\u7528\u6027\u3002<\/p>\n<p><a name=\"cache\"><\/a><\/p>\n<h3><a id=\"cache\u9884\u53d6\" class=\"anchor\" href=\"https:\/\/gitee.com\/Kenneth-Lee-2012\/know_modern_server_from_kunpeng920_pub\/blob\/pub\/source\/%E8%AE%A1%E7%AE%97%E5%AD%90%E7%B3%BB%E7%BB%9F\/%E5%86%85%E5%AD%98%E8%AE%BF%E9%97%AE%E6%A8%A1%E5%9E%8B.rst#cache%E9%A2%84%E5%8F%96\"><\/a>Cache\u9884\u53d6<\/h3>\n<p>\u8bbf\u95ee\u5185\u5b58\u6bd4\u8f83\u6162\uff0c\u8bbf\u95eeCache\u5c31\u5feb\u5f97\u591a\uff0c\u8d8a\u9760\u8fd1CPU\u7684Cache\u8bbf\u95ee\u8d8a\u5feb\u3002<\/p>\n<p>todo\uff1a\u63d0\u4f9b\u4e00\u4e2a\u793a\u4f8b\u7a0b\u5e8f\uff0c\u548c\u8fd0\u884c\u7ed3\u679c\u3002<\/p>\n<p>\u8fd9\u6837\u5f88\u81ea\u7136\u6211\u4eec\u6211\u60f3\u5230\u8981\u6253\u8fd9\u4e2a\u65f6\u95f4\u5dee\uff0c\u6bd4\u5982\u6211\u4eec\u53ef\u4ee5\u5148\u53d1\u8d77\u4e00\u4e2aCache\u8bbf\u95ee\u64cd\u4f5c\uff0c\u7136\u540e \u5148\u5b8c\u6210\u5176\u4ed6\u8ba1\u7b97\uff0c\u7136\u540e\u518d\u6765\u4f7f\u7528\u8fd9\u4e2a\u5730\u5740\uff0c\u8fd9\u6837\u5185\u5b58\u52a0\u8f7d\u548c\u8ba1\u7b97\u5c31\u53ef\u4ee5\u5e76\u884c\u8d77\u6765\u3002<\/p>\n<p>\u6bd4\u5982\u4e0b\u9762\u662f\u4e00\u4e2a\u77e9\u9635\u4e58\u6cd5\u7684\u7b97\u6cd5\uff1a<\/p>\n<pre lang=\"c\">int a[W][H]; \/\/\u7b2c\u4e00\u4e2a\u77e9\u9635\r\nint b[H][W]; \/\/\u7b2c\u4e8c\u4e2a\u77e9\u9635\r\nint c[W][W]; \/\/\u7ed3\u679c\r\n\r\nfor (i=0; i&lt;W; i++) {\r\n        for(j=0; j&lt;W; j++) {\r\n                c[i][j] = 0;\r\n                for (k=0; k&lt;H; k++) {\r\n                        c[i][j] += a[i][k]*b[k][j];\r\n                }\r\n\r\n        }\r\n}\r\n<\/pre>\n<p>\u8fd9\u4e2a\u5faa\u73af\u4e2d\u7684\u5173\u952e\u8ba1\u7b97\u662f\u4e2d\u95f4\u7684\u6838\u5fc3\u4e58\u6cd5\uff0c\u4f46\u5728\u9cb2\u9e4f920\u4e2d\uff0c\u4e00\u4e2a\u4e58\u6cd5\u7684\u65f6\u95f4\uff0c\u5c31\u7b97\u4e0d\u8003 \u8651\u6d41\u6c34\u7ebf\uff0c\u4e5f\u4e0d\u8fc73\u523012\u4e2a\u65f6\u949f\u5468\u671f\uff0c\u4f46\u5982\u679c\u9700\u8981\u4eceDDR\u4e2d\u628a\u6570\u636e\u63d0\u53d6\u51fa\u6765\uff0c\u5e38\u5e38\u5c31\u9700\u8981\u8d85 \u8fc7100\u4e2a\u65f6\u949f\u5468\u671f\uff08todo\uff1a\u9700\u8981\u518d\u6b21\u786e\u8ba4\uff09\u3002\u6240\u4ee5\u6700\u597d\u662f\u5728\u8fd8\u5728\u8ba1\u7b97\u7684\u65f6\u5019\u5c31\u5f00\u59cb\u5148\u8ba9 Cache\u628a\u6570\u636e\u53d6\u51fa\u6765\uff0c\u8ba9\u8ba1\u7b97\u548c\u52a0\u8f7d\u7684\u8fc7\u7a0b\u540c\u6b65\u8fdb\u884c\u3002\u6bd4\u5982\u8fd9\u6837\uff1a<\/p>\n<pre lang=\"c\">for (i=0; i&lt;W; i++) {\r\n        for(j=0; j&lt;W; j++) {\r\n                c[i][j] = 0;\r\n                if (!(j%INT_PER_CACHELINE))\r\n                        __builtin_prefetch((const void *)&amp;c[i][j+INT_PER_CACHELINE], 1, 3);\r\n                for (k=0; k&lt;H; k++) {\r\n                        c[i][j] += a[i][k]*b[k][j];\r\n                        if (!j &amp;&amp; !(k%INT_PER_CACHELINE))\r\n                                __builtin_prefetch((const void *)&amp;a[i][k+INT_PER_CACHELINE], 0, 3);\r\n                        if (!i &amp;&amp; !(j%INT_PER_CACHELINE))\r\n                                __builtin_prefetch((const void *)&amp;b[k][j+INT_PER_CACHELINE], 0, 3);\r\n                }\r\n        }\r\n}\r\n<\/pre>\n<p>\u5176\u4e2d\u8fd9\u91cc\u7684__builtin_prefetch\u662fgcc\u7684\u5185\u7f6e\u51fd\u6570\uff0c\u5728\u4e0d\u540c\u7684\u786c\u4ef6\u5e73\u53f0\u4e0a\u5c01\u88c5\u4e3a\u4e0d\u540c\u7684\u9884 \u53d6\u6307\u4ee4\u3002\u5728\u4e0a\u9762\u7684\u7b97\u6cd5\u4e2d\uff0c\u6211\u4eec\u8fdb\u884c\u67d0\u4e2a\u5411\u91cf\u5355\u5143\u7684\u8ba1\u7b97\u7684\u65f6\u5019\uff0c\u5df2\u7ecf\u53ef\u4ee5\u77e5\u9053\u540e\u9762\u8981\u8ba1 \u7b97\u7684\u5185\u5b58\u5355\u5143\u662f\u4ec0\u4e48\u4e86\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u63d0\u524d\u628a\u6570\u636e\u53d6\u51fa\u6765\u3002<\/p>\n<p>\u8fd9\u662f\u9cb2\u9e4f920\u4e0a\uff0cPRFM\u548cPLI\u7b49\u6307\u4ee4\u7684\u8bbe\u8ba1\u521d\u8877\u3002\u4f46\u5b9e\u9645\u4e0a\uff0c\u5982\u679c\u5728\u9cb2\u9e4f920\u4e0a\u8fd0\u884c\u8fd9\u4e2a\u7a0b \u5e8f\uff0c\u5f88\u53ef\u80fd\u5e76\u4e0d\u4f1a\u8ba9\u901f\u5ea6\u66f4\u5feb\u3002\u56e0\u4e3a\u9664\u4e86\u8f6f\u4ef6\u5728\u505aprefetch\u5916\uff0c\u786c\u4ef6\u4e5f\u5728\u9884\u5224\u6307\u4ee4\u5e8f\u5217\u7684 \u884c\u4e3a\uff0c\u8fd9\u4e24\u8005\u4e00\u7efc\u5408\uff0c\u8fd9\u4e2a\u6548\u679c\u5c31\u6ca1\u6709\u4e86\u3002<\/p>\n<p>\u786c\u4ef6prefetch\u662f\u4e2a\u8bad\u7ec3\u5668\uff0c\u6839\u636ePC\u548c\u76ee\u6807\u5730\u5740\u7684\u5386\u53f2\u52a8\u6001\u63d2\u5165prefetch\u3002\u793a\u610f\u5982\u4e0b\uff1a<\/p>\n<blockquote>\n<div><img decoding=\"async\" src=\"https:\/\/gitee.com\/Kenneth-Lee-2012\/know_modern_server_from_kunpeng920_pub\/raw\/pub\/source\/%E8%AE%A1%E7%AE%97%E5%AD%90%E7%B3%BB%E7%BB%9F\/hw_prefetch.svg\" \/><\/div>\n<\/blockquote>\n<p>\u65e9\u671f\u7684prefetch\u7b97\u6cd5\u6bd4\u8f83\u7b80\u5355\uff0c\u6bd4\u5982Next Line\u7b97\u6cd5\uff0c\u4ec5\u4ec5\u5c31\u662f\u4f60\u53d6\u4e86Cacheline i\uff0cHWP \u5e2e\u4f60\u53d6Cacheline i+1\uff0c\u540e\u6765\u9010\u6b65\u51fa\u73b0\u7528\u4e8e\u652f\u6301\u7c7b\u4f3cmemcpy\u8fd9\u6837\u7684stream\u7b97\u6cd5\u548c\u652f\u6301\u591a\u4e2a \u5185\u5b58\u5411\u91cf\u8fd0\u7b97\uff08\u7c7b\u4f3c\u4e0a\u9762\u7684\u6a21\u578b\uff09\u7684Stride-K\u7b97\u6cd5\uff0c\u4ee5\u53ca\u66f4\u52a0\u590d\u6742\u7684\u6bd4\u5982Spatial Memory Stream\u8fd9\u6837\u7684\u7b97\u6cd5\u3002\u672a\u6765\u4e5f\u8bb8\u4f1a\u7528\u673a\u5668\u5b66\u4e60\u7684\u6a21\u578b\u6765\u5b9e\u73b0\u8fd9\u4e2a\u90e8\u5206\u3002\u9cb2\u9e4f920\u7684\u5b9e\u73b0\u662f\u628a \u591a\u4e2a\u7b97\u6cd5\u7ec4\u5408\u5728\u4e00\u8d77\u5b9e\u73b0\u7684\u3002\u4f46\u65e0\u8bba\u5982\u4f55\uff0c\u8f6f\u4ef6\u5de5\u7a0b\u5e08\u60f3\u627e\u51fa\u67d0\u79cd\u89c4\u5f8b\u548c\u5b83\u914d\u5408\uff0c\u5176\u5b9e\u5f88 \u56f0\u96be\u3002<\/p>\n<p>\u73b0\u5728\u8fd9\u4e2a\u9636\u6bb5\uff0c\u6211\u662f\u5efa\u8bae\u5bf9\u4e8e\u8fd9\u4e2aprefetch\u7684\u4f7f\u7528\u968f\u7f18\u3002\u6709\u4e9b\u4f18\u5316\u5de5\u7a0b\u5e08\u63d0\u51fa\u8fd9\u4e48\u4e00\u4e2a\u7b56 \u7565\uff1a\u5148\u628a\u786c\u4ef6prefetch\u5173\u6389\uff08todo\uff1a\u8865\u5145\u4e00\u5f20\u56fe\uff0c\u5c55\u793aBIOS\u4e2d\u7684\u914d\u7f6e\u9879\uff09\u8fdb\u884c\u4f18\u5316\uff0c\u5982\u679c \u6709\u6548\u679c\uff0c\u5c31\u91cd\u65b0\u628aprefetch\u6253\u5f00\uff0c\u5982\u679c\u6027\u80fd\u6ca1\u6709\u53d8\u5dee\uff0c\u5c31\u7559\u7740\u5b83\u3002\u901a\u5e38\u786c\u4ef6prefetch\u53ea\u662f \u8ba9\u8f6f\u4ef6prefetch\u6ca1\u6709\u6548\u679c\uff0c\u4e0d\u4f1a\u8ba9\u5b83\u53d8\u5f97\u66f4\u5dee\u3002<\/p>\n<p><a name=\"cache-coherency\"><\/a><\/p>\n<h3><a id=\"cache-coherency\" class=\"anchor\" href=\"https:\/\/gitee.com\/Kenneth-Lee-2012\/know_modern_server_from_kunpeng920_pub\/blob\/pub\/source\/%E8%AE%A1%E7%AE%97%E5%AD%90%E7%B3%BB%E7%BB%9F\/%E5%86%85%E5%AD%98%E8%AE%BF%E9%97%AE%E6%A8%A1%E5%9E%8B.rst#cache-coherency\"><\/a>Cache Coherency<\/h3>\n<p>\u5b58\u5728Cache\uff0c\u5c31\u4f1a\u5b58\u5728\u5185\u5b58\u6570\u636e\u6709\u591a\u4e2a\u7248\u672c\u7684\u95ee\u9898\u3002\u4e3a\u4e86\u5b9e\u73b0\u591a\u4e2aCPU\u7684\u6570\u636e\u4ea4\u6362\uff0c\u6211\u4eec\u5c31 \u8981\u786e\u5b9a\u591a\u4e2a\u201c\u89c2\u5bdf\u8005\u201d\u770b\u5230\u7684\u5185\u5b58\u7684\u4e00\u81f4\u6027\u3002\u8fd9\u53ef\u4ee5\u4e24\u79cd\u7b56\u7565\uff0c\u4e00\u79cd\u662f\u8ba9\u6bcf\u4e2a\u7528\u6237\u81ea\u5df1\u4e3b\u52a8 \u628aCache\u63a8\u7ed9\u53e6\u4e00\u7aef\uff0c\u53e6\u4e00\u79cd\u65b9\u6848\u662f\u786c\u4ef6\u4e3b\u52a8\u7ef4\u62a4Cache\u7684\u4e00\u81f4\u6027\uff0c\u8ba9\u6bcf\u4e2a\u89c2\u5bdf\u8005\u201c\u89c9\u5f97\u201d Cache\u4e0d\u5b58\u5728\u3002\u540e\u9762\u8fd9\u79cd\u7b56\u7565\uff0c\u5c31\u79f0\u4e3aCache Coherent\uff0c\u7b80\u79f0CC\u3002\u5728\u4e2d\u6587\u8bed\u5883\u4e2d\uff0c\u6211\u4eec\u65e2 \u628aCC\u4f5c\u4e3a\u5f62\u5bb9\u8bcd\u7528\uff0c\u4e5f\u4f5c\u4e3a\u540d\u8bcd\u7528\uff0c\u5bf9\u5e94\u82f1\u6587\u7684Cache Coherency\u3002<\/p>\n<p>\u9cb2\u9e4f920\u7684\u603b\u7ebf\u5bf9\u5916\u5ba3\u79f0\u662fCC\u7684\u3002\u8fd9\u53ef\u4ee5\u4ece\u4e24\u4e2a\u5c42\u9762\u6765\u8bf4\u3002\u4ece\u534f\u8bae\u652f\u6301\u6765\u8bf4\uff0c\u524d\u9762\u4ecb\u7ecd\u603b \u7ebf\u7684\u65f6\u5019\u6211\u4eec\u8bf4\u8fc7\uff0c\u9cb2\u9e4f\u603b\u7ebf\u652f\u6301AMBA\u534f\u8bae\uff0c\u5305\u62ecAMBA\u7684CHI\u534f\u8bae\uff0c\u6240\u4ee5\u6bcf\u4e2aStation\u540e\u9762 \u7684\u8282\u70b9\uff0c\u53ef\u4ee5\u57fa\u4e8e\u8fd9\u4e2a\u534f\u8bae\u5b9e\u73b0Cache\u4e4b\u95f4\u7684\u540c\u6b65\u3002\u6240\u4ee5\uff0c\u5bf9\u4e8e\u611f\u77e5\u8fd9\u4e2a\u534f\u8bae\u7684\u8282\u70b9\uff0c\u53ef \u4ee5\u76f4\u63a5\u57fa\u4e8e\u8fd9\u4e9b\u534f\u8bae\u53bb\u4fdd\u8bc1\u4e0d\u540c\u8282\u70b9\u4e4b\u95f4Cache\u662f\u540c\u6b65\u7684\u3002<\/p>\n<p>\u800c\u5bf9\u4e8e\u4e0d\u8ba4\u77e5\u8fd9\u4e2a\u534f\u8bae\u7684\u8282\u70b9\uff0cStation\u4e0a\u53d1\u51fa\u7684\u5c31\u662f\u7b80\u5355\u7684\u7269\u7406\u5730\u5740\u8bf7\u6c42\uff0c\u603b\u7ebf\u4ecd\u53ef\u4ee5 \u4fdd\u8bc1\u5bf9\u5b83\u6765\u8bf4\uff0c\u5176\u4ed6\u8282\u70b9\u7684\u5185\u5bb9\u662fCache Coherent\u7684\uff0c\u5b83\u81ea\u5df1\u6709Cache\u7684\u8bdd\uff0c\u5c31\u662f\u5b83\u81ea\u5df1 \u5982\u4f55\u4fdd\u8bc1\u5b83\u81ea\u5df1\u548c\u522b\u4eba\u901a\u8baf\u7684\u65f6\u5019Cache\u662f\u540c\u6b65\u7684\u8fd9\u4e2a\u95ee\u9898\u4e86\u3002<\/p>\n<blockquote>\n<div><img decoding=\"async\" src=\"https:\/\/gitee.com\/Kenneth-Lee-2012\/know_modern_server_from_kunpeng920_pub\/raw\/pub\/source\/%E8%AE%A1%E7%AE%97%E5%AD%90%E7%B3%BB%E7%BB%9F\/cache_coherency_on_kp920.svg\" \/><\/div>\n<\/blockquote>\n<p>\u5177\u4f53\u7684CHI\u534f\u8bae\u5982\u4f55\u5de5\u4f5c\uff0c\u6709\u6807\u51c6\u6587\u672c\u5b9a\u4e49\u3002\u672c\u6587\u4e0d\u91cd\u590d\u8fd9\u4e9b\u6807\u51c6\u6587\u672c\u3002\u8fd9\u5b8c\u5168\u662f\u4e00\u4e2a\u5982 \u4f55\u6807\u8bb0Cacheline\u72b6\u6001\uff0c\u4ee5\u53ca\u5728\u901a\u8baf\u7f51\u7edc\u4e2d\u9009\u62e9\u54ea\u4e2a\u8282\u70b9\u8fdb\u884c\u6d88\u606f\u540c\u6b65\u7684\u95ee\u9898\u3002\u800c\u4e14\u8fd9\u4e2a \u534f\u8bae\u4e00\u76f4\u5728\u6539\u53d8\uff0c\u4ece\u4f7f\u7528\u8005\u7684\u89d2\u5ea6\uff0c\u611f\u77e5\u8fd9\u4e2a\u534f\u8bae\u7684\u7ec6\u8282\uff0c\u5bf9\u8f6f\u4ef6\u8bbe\u8ba1\u6ca1\u6709\u592a\u591a\u7684\u610f\u4e49\uff0c \u6211\u4eec\u66f4\u5173\u5fc3\u7684\u662f\u8fd9\u4e2a\u8bbe\u8ba1\u7684\u7279\u5f81\uff0c\u5982\u4f55\u5f71\u54cd\u8f6f\u4ef6\u8bbe\u8ba1\u65f6\u7684\u53d6\u820d\u3002<\/p>\n<p>\u4ece\u67b6\u6784\u4e0a\u8bf4\uff0cCC\u7684\u5173\u952e\u5728\u4e8e\u6240\u6709\u7684\u901a\u8baf\u8282\u70b9\uff0c\u8c01\u627f\u8bfa\u4e86\u548c\u4f60CC\uff0c\u4ee5\u53ca\u8c01\u4f60\u624b\u4e2d\u6570\u636e\u7684\u53e6\u4e00 \u4efd\u6570\u636e\u3002\u6240\u4ee5\uff0c\u5728\u5b83\u7684\u6982\u5ff5\u7a7a\u95f4\u4e2d\uff0c\u6709\u4e24\u4e2a\u975e\u5e38\u5173\u952e\u7684\u6982\u5ff5\uff1a<\/p>\n<ul>\n<li>PoS\uff1aPoint of Serialization\uff0c\u4e32\u884c\u5316\u70b9\u3002\u8fd9\u662f\u7279\u5b9a\u5b9e\u73b0\u9009\u4e2d\u7684\uff0c\u628a\u8bf7\u6c42\u5728\u8fd9\u4e2a\u70b9\u4e0a \u8fdb\u884c\u6392\u961f\u7684\u70b9\uff0c\u4e5f\u5c31\u662f\u8fdb\u884c\u540c\u6b65\u7684\u4e2d\u5fc3\u70b9\u3002\u8fd9\u79cd\u70b9\u901a\u5e38\u627f\u8f7d\u5728\u4e00\u4e2a\u79f0\u4e3aHome Node\u7684\u8282 \u70b9\u4e0a\uff0c\u8d1f\u8d23\u4ee3\u7406\u5b9e\u9645\u7684\u5730\u5740\u8bf7\u6c42\u3002\u4e0d\u540c\u5730\u5740\u7684PoS\u548cHN\u4e0d\u9700\u8981\u662f\u540c\u4e00\u4e2a\u3002<\/li>\n<li>\u5171\u4eab\u72b6\u6001\uff1a\u8868\u793a\u4e00\u4e2aCacheline\u662f\u5426\u88ab\u5171\u4eab\uff0c\u5982\u679c\u5b83\u6ca1\u6709\u88ab\u5171\u4eab\uff0c\u6211\u4eec\u53ea\u9700\u8981\u5173\u5fc3\u5b83\u662f \u5426\u6709\u6548\uff08\u79f0\u4e3aValid\uff09\u4ee5\u53ca\u662f\u5426\u5df2\u7ecf\u540c\u6b65\u5230\u4e0a\u7ea7Cache\u4e0a\uff08\u6ca1\u6709\u540c\u6b65\u79f0\u4e3aDirty\uff0c\u540c\u6b65\u79f0 \u4e3aClean\uff09\u4e86\uff0c\u5982\u679c\u5b83\u88ab\u5171\u4eab\uff0c\u6211\u4eec\u5c31\u9700\u8981\u968f\u65f6\u5230PoS\u4e0a\u901a\u77e5\u6240\u6709\u7684\u5171\u4eab\u8282\u70b9\u3002<\/li>\n<\/ul>\n<p>\u6240\u4ee5\uff0c\u5bf9\u4e8eCC\uff0c\u8f6f\u4ef6\u6838\u5fc3\u9700\u8981\u5173\u5fc3\u7684\uff0c\u662f\u51cf\u5c11\u5171\u4eabCacheline\uff0c\u6bd4\u5982\u4f60\u5b9a\u4e49\u4e00\u4e2a\u6570\u7ec4\uff0c\u6bcf \u4e2aCPU\u4e00\u4e2a\u6210\u5458\uff0c\u8fd9\u4e9b\u6210\u5458\u672c\u6765\u6ca1\u6709\u5173\u7cfb\u7684\uff0c\u4f46\u5982\u679c\u4f60\u8ba9\u4ed6\u4eec\u7684\u5185\u5bb9\u4ea4\u7ec7\u5728\u4e00\u8d77\uff0c\u786c\u4ef6\u5c31 \u8ba4\u4e3a\u4ed6\u4eec\u5171\u4eab\u4e86\u6570\u636e\uff0c\u6bcf\u6b21\u66f4\u65b0\u90fd\u8981\u8d70\u4e00\u6b21CC\u534f\u8bae\uff0c\u8fd9\u4e2a\u901f\u5ea6\u5c31\u4f1a\u6162\u4e0b\u6765\u3002<\/p>\n<p>todo\uff1a\u63d0\u4f9b\u4e00\u4e2a\u4f8b\u5b50\u7a0b\u5e8f\u5448\u73b0\u4e00\u4e0b\u6570\u636e\u3002<\/p>\n<p>\u53e6\u5916\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u770b\u5230\uff0cCC\u7684\u590d\u6742\u5ea6\u4e5f\u548c\u5171\u4eab\u6570\u636e\u7684\u8282\u70b9\u7684\u6570\u91cf\u6709\u5173\uff0c\u6240\u4ee5\u4e0d\u8981\u8ba9\u6ca1\u6709\u5fc5 \u8981\u5171\u4eab\u7684\u6570\u636e\u7684Cacheline\u51fa\u73b0\u5728\u65e0\u5173\u7684\u8282\u70b9\u4e0a\uff0c\u65e0\u8bba\u662fCPU\u8fd8\u662f\u8bbe\u5907\u3002<\/p>\n<p>todo\uff1a\u518d\u63d0\u4f9b\u4e00\u4e2a\u4f8b\u5b50\u5448\u73b0\u8fd9\u4e2a\u7279\u5f81\u3002<\/p>\n<p><a name=\"cache-qos\"><\/a><\/p>\n<h3><a id=\"cache-qos\" class=\"anchor\" href=\"https:\/\/gitee.com\/Kenneth-Lee-2012\/know_modern_server_from_kunpeng920_pub\/blob\/pub\/source\/%E8%AE%A1%E7%AE%97%E5%AD%90%E7%B3%BB%E7%BB%9F\/%E5%86%85%E5%AD%98%E8%AE%BF%E9%97%AE%E6%A8%A1%E5%9E%8B.rst#cache-qos\"><\/a>Cache QoS<\/h3>\n<p>Cache\u53ef\u4ee5\u5927\u5e45\u63d0\u9ad8\u6bcf\u4e2a\u8282\u70b9\u7684\u5904\u7406\u5f62\u6210\uff0c\u6240\u4ee5\u5b83\u975e\u5e38\u91cd\u8981\uff0c\u5982\u679c\u67d0\u4e2a\u8fdb\u7a0b\u6216\u8005\u865a\u62df\u673a\u8bbf \u95ee\u4e86\u5927\u91cf\u7684\u6570\u636e\uff0c\u5c31\u4f1a\u5bfc\u81f4\u5176\u4ed6\u8fdb\u7a0b\u6216\u8005\u865a\u62df\u673a\u7684Cacheline\u4e0d\u65ad\u5931\u6548\u3002\u8fd9\u6837Cache QoS\u5c31 \u6210\u4e3a\u4e86\u670d\u52a1\u5668\u4e00\u4e2a\u91cd\u8981\u7684\u9700\u6c42\u4e86\u3002<\/p>\n<p>todo\uff1a920\u7684Cache QoS\u7279\u6027<\/p>\n<p><a name=\"id6\"><\/a><\/p>\n<h2><a id=\"\u5185\u5b58\u987a\u5e8f\u6a21\u578b\" class=\"anchor\" href=\"https:\/\/gitee.com\/Kenneth-Lee-2012\/know_modern_server_from_kunpeng920_pub\/blob\/pub\/source\/%E8%AE%A1%E7%AE%97%E5%AD%90%E7%B3%BB%E7%BB%9F\/%E5%86%85%E5%AD%98%E8%AE%BF%E9%97%AE%E6%A8%A1%E5%9E%8B.rst#%E5%86%85%E5%AD%98%E9%A1%BA%E5%BA%8F%E6%A8%A1%E5%9E%8B\"><\/a>\u5185\u5b58\u987a\u5e8f\u6a21\u578b<\/h2>\n<p>\u591a\u8282\u70b9\uff0c\u5e26Cache\u7684\u901a\u8baf\u6a21\u578b\uff0c\u8fd8\u5e26\u6765\u53e6\u4e00\u4e2a\u5185\u5b58\u8bed\u4e49\u4e0a\u7684\u95ee\u9898\uff0c\u5c31\u662f\u5185\u5b58\u4ee5\u4ec0\u4e48\u6837\u7684\u987a \u5e8f\u5448\u73b0\u7ed9\u4e0d\u540c\u7684\u901a\u8baf\u63a5\u53e3\u3002<\/p>\n<p>\u6bd4\u5982\u8bf4\uff0c\u6211\u4eec\u6709\u4e24\u4e2aCPU\uff08\u6838\uff09\u901a\u8fc7\u5185\u5b58\u8fdb\u884c\u901a\u8baf\uff0c\u5185\u5b58mem[0-16]\u662f\u6570\u636e\uff0cmem[17]\u662f\u6570 \u636e\u6709\u6548\u7684\u6807\u8bb0\u3002\u8d1f\u8d23\u51c6\u5907\u6570\u636e\u7684CPU\u8fd9\u6837\u5199\u7a0b\u5e8f\uff1a<\/p>\n<pre lang=\"c\">mem[0] = xxx;\r\nmem[1] = xxx;\r\n...\r\n\r\nmem[17] = VALID;\r\n<\/pre>\n<p>\u8fd9\u4e2a\u201c\u7a0b\u5e8f\u987a\u5e8f\u201d\u662fmem[0], mem[1]\u8fd9\u6837\u4e00\u8def\u4fee\u6539\u8fc7\u53bb\u7684\uff0c\u4f46\u8fd9\u4e2a\u201c\u7a0b\u5e8f\u987a\u5e8f\u201d\u5f88\u591a\u65f6\u5019\u90fd\u4e0d \u662f\u7cfb\u7edf\u7684\u627f\u8bfa\uff0c\u6709\u5f88\u591a\u4eba\u90fd\u53ef\u4ee5\u4fee\u6539\u5b83\uff0c\u6bd4\u5982\uff1a<\/p>\n<ul>\n<li>\u7f16\u8bd1\u5668\uff1a\u7f16\u8bd1\u5668\u53ef\u4ee5\u4ee5\u6d41\u6c34\u7ebf\uff0c\u5bc4\u5b58\u5668\u4f7f\u7528\u7b49\u4f18\u5316\u4e3a\u7406\u7531\uff0c\u628a\u6ca1\u6709\u4f9d\u8d56\u5173\u7cfb\u7684\u5185\u5b58\u8bbf\u95ee \u91cd\u65b0\u8c03\u5ea6\u3002<\/li>\n<li>CPU\uff1aCPU\u987a\u5e8f\u6267\u884c\u6307\u4ee4\uff0c\u4f46\u7531\u4e8e\u6d41\u6c34\u7ebf\u548c\u5f02\u6b65\u6267\u884c\u7684\u5b58\u5728\uff0c\u524d\u4e00\u6761\u6307\u4ee4\u6ca1\u6709\u6267\u884c\u5b8c\uff0c\u4e0b \u4e00\u6761\u6307\u4ee4\u5c31\u53ef\u80fd\u751f\u6548\u4e86\u3002<\/li>\n<li>\u5b58\u50a8\u7cfb\u7edf\uff1aCPU\u7684\u8bbf\u5b58\u7cfb\u7edf\u53ef\u80fd\u4f1a\u5408\u5e76\u8bbf\u95ee\u64cd\u4f5c\uff0c\u5728\u4e0d\u540c\u7684Cache\u4e0a\u751f\u6548\u548c\u540c\u6b65\u7684\u65f6\u673a\u4e5f \u4e0d\u540c\uff0c\u8fd9\u540c\u6837\u4f1a\u6539\u53d8\u8fd9\u4e2a\u987a\u5e8f\u6a21\u578b\u3002<\/li>\n<\/ul>\n<p>\u4f46\u5982\u679c\u6ca1\u6709\u4e00\u4e2a\u89c4\u77e9\uff0c\u4e0a\u9762\u8fd9\u4e2a\u7a0b\u5e8f\u5c31\u6ca1\u6cd5\u5199\u4e86\u3002\u8fd9\u662f\u5185\u5b58\u987a\u5e8f\u6a21\u578b\u8981\u89e3\u51b3\u7684\u95ee\u9898\u3002<\/p>\n<p>\u6700\u7c97\u66b4\u7684\u65b9\u6cd5\u662f\u8981\u6c42\u6240\u6709\u5185\u5b58\u7684\u8bbf\u95ee\u987a\u5e8f\u90fd\u548c\u7a0b\u5e8f\u987a\u5e8f\u4e00\u81f4\uff0c\u4f46\u524d\u9762\u6211\u4eec\u4e5f\u770b\u5230\u4e86\uff0c\u8fd9\u6837 \u7684\u8981\u6c42\u5c31\u7981\u6b62\u4e86\u7f16\u8bd1\u5668\uff0cCPU\uff0c\u5305\u62ec\u5b58\u50a8\u7cfb\u7edf\u7684\u6240\u6709\u4f18\u5316\uff0c\u6240\u6709\u5185\u5b58\u64cd\u4f5c\u90fd\u5fc5\u987b\u4e32\u884c\u6392\u961f \uff0c\u8fd9\u4e2a\u6027\u80fd\u65e0\u6cd5\u63a5\u53d7\u3002\u4f46\u4f5c\u4e3a\u548c\u5176\u4ed6\u65b9\u6848\u5bf9\u6bd4\uff0c\u6211\u4eec\u628a\u8fd9\u4e2a\u65b9\u5f0f\u79f0\u4e3a\u7edd\u5bf9\u987a\u5e8f\u6a21\u578b\u3002<\/p>\n<p>\u4e1a\u754c\u6bd4\u8f83\u5e38\u89c1\u7684\u5185\u5b58\u987a\u5e8f\u534f\u8bae\u6709\u4e24\u79cd\uff0cTotal Store Ordering\u548cWeak Memory Ordering\u3002 \u540e\u7eed\u884c\u6587\u7528TSO\u548cWMO\u6765\u5206\u522b\u6307\u4ee3\u4e24\u79cd\u5185\u5b58\u8bbf\u95ee\u6a21\u578b\u3002 \u8fd9\u4e24\u4e2a\u540d\u5b57\u4e5f\u4e0d\u662f\u4e25\u683c\u7684\u5b9a\u4e49\uff0c\u4e0d\u540c\u7684\u4f53\u7cfb\u7ed3\u6784\u5bf9\u5b83\u4eec\u6709\u4e0d\u540c\u7684\u7ec6\u8282\u8981\u6c42\uff0c\u4f46\u6211\u4eec\u603b\u7684\u6765 \u8bf4\uff0c\u5b83\u4eec\u7684\u539f\u7406\u57fa\u672c\u662f\u4e00\u81f4\u7684\uff0c\u6211\u4eec\u8fd9\u91cc\u91cd\u70b9\u8ba8\u8bba\u8fd9\u4e2a\u57fa\u672c\u539f\u7406\u3002<\/p>\n<p>\u65e0\u8bba\u662f\u54ea\u79cd\u5185\u5b58\u987a\u5e8f\u6a21\u578b\uff0c\u672c\u5730\u7684\u8bed\u4e49\u4f9d\u8d56\u662f\u5fc5\u987b\u4fdd\u8bc1\u7684\uff0c\u6bd4\u5982\u5bf9\u4e8e\u540c\u4e00\u4e2aCPU\uff0c\u5411 mem[0]\u5199\u5165a\uff0c\u63a5\u7740\u8bfb\u51fa\u6765\uff0c\u8bfb\u51fa\u6765\u7684\u503c\u5c31\u5fc5\u987b\u662fa\u3002\u53cd\u8fc7\u6765\uff0c\u5982\u679cmem[0]\u672c\u6765\u662fb\uff0c\u4f60\u5148 \u8bfb\u8fd9\u4e2a\u503c\uff0c\u7136\u540e\u5199\u6210a\uff0c\u8fd9\u4e2a\u8bfb\u51fa\u6765\u7684\u503c\u5c31\u53ea\u80fd\u662fb\uff0c\u4e0d\u80fd\u662fa\u3002\u7f16\u8bd1\u5668\u548cCPU\u7684\u4f18\u5316\u53ea\u662f\u5c1d \u8bd5\u5728\u672c\u5730\u7a0b\u5e8f\u8bed\u4e49\u611f\u53d7\u4e0d\u5230\u7684\u5730\u65b9\u5077\u6b65\uff0c\u5982\u679c\u672c\u5730\u7b97\u6cd5\u4e0a\u6709\u4f9d\u8d56\u7684\u987a\u5e8f\u90fd\u4e0d\u80fd\u4fdd\u8bc1\uff0c\u8fd9\u5c31 \u4e0d\u662f\u51af\u8bfa\u4f9d\u66fc\u8ba1\u7b97\u673a\u4e86\u3002<\/p>\n<p>\u987a\u5e8f\u534f\u8bae\u4fdd\u8bc1\u7684\u662f\u5728\u603b\u7ebf\u4e0a\u7684\u6240\u6709\u53ef\u4ee5\u8bbf\u95ee\u5185\u5b58\u7684\u901a\u8baf\u5b9e\u4f53\uff08\u6bd4\u5982CPU\uff09\u5185\u5b58\u53d8\u5316\u7684\u987a\u5e8f \u662f\u53ef\u63a7\u5236\u7684\uff0c\u53ef\u9884\u671f\u7684\u3002<\/p>\n<p>Total Store Ordering\u7684\u672c\u8d28\u662f\u5728\u5168\u7cfb\u7edf\u4e2d\u7ef4\u62a4\u4e00\u4e2a\u5168\u5c40\u7684Store\u987a\u5e8f\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u5728\u4e00 \u4e2a\u6838\u4e0a\u5199\u7684\u5148\u540e\u987a\u5e8f\uff0c\u5728\u5176\u4ed6\u6838\u4e0a\u4e5f\u4f1a\u770b\u5230\u4e00\u6837\u7684\u5148\u540e\u987a\u5e8f\u3002\u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0cmem[0]\uff0c mem[1]\u4e00\u4e2a\u4e2a\u5199\u4e0b\u6765\uff0c\u5230mem[17]\u5199VALID\uff0c\u5176\u4ed6\u6838\u770b\u5230mem[17]=VALID\u7684\u65f6\u5019\uff0cmem[0]\u7684 \u503c\u4e00\u5b9a\u662f\u5df2\u7ecf\u5199\u597d\u7684\u503c\u3002\u4f46\u8fd9\u4e0d\u5305\u62ec\u8bfb\u3002<\/p>\n<p>\u6bd4\u5982\u6211\u4eec\u5728\u4e24\u4e2a\u6838\u4e0a\u5206\u522b\u6267\u884c\u4e0b\u9762\u7684\u7a0b\u5e8f\uff1a:<\/p>\n<pre>\/\/assume mem[0]==memp1]==0 at beginning\r\n &lt;cpu1&gt;                   &lt;cpu2&gt;\r\nmem[0] = 1;             mem[1] = 1;\r\nprint(mem[1]);          print(mem[0]);\r\n<\/pre>\n<p>\u5047\u5b9amem\u91cc\u4e00\u5f00\u59cb\u90fd\u662f0\uff0ccpu1\u4e0a\uff0c\u6211\u4eec\u5148\u5199mem[0]\uff0c\u7136\u540e\u8bfbmem[1]\u3002\u800ccpu2\u4e0a\uff0c\u6211\u4eec\u5148\u5199 mem[1]\uff0c\u518d\u8bfbmem[0]\u3002\u6309TSO\uff0c\u5b83\u53ea\u4fdd\u8bc1cpu1\u4e0a\u7684mem[0]\u5199\u548ccpu2\u4e0a\u7684mem[1]\u5199\u662f\u6709\u5e8f \u7684\uff0c\u8fd9\u91cc\u6240\u8c13\u7684\u6709\u5e8f\u662f\u6307cpu1\u548ccpu2\u770b\u5230\u7684\u5199\u987a\u5e8f\u8981\u4e48\u662fmem[0] = 1\uff0c\u7136\u540emem[1] = 1\uff0c \u8981\u4e48\u662fmem[1] = 1\uff0c\u7136\u540e\u662fmem[0] = 1\uff0c\u4f46\u8bfb\u5728\u4ec0\u4e48\u65f6\u5019\u53d1\u751f\u4f5c\u7528\u662f\u4e0d\u4fdd\u8bc1\u7684\uff0c\u56e0\u6b64\u5bf9\u4e8e\u4e0b\u9762\u56db\u79cd\u8bfb\u8f93\u51fa\uff1a:<\/p>\n<pre>mem[0, 1] = 0, 1\r\nmem[0, 1] = 1, 0\r\nmem[0, 1] = 1, 1\r\nmem[0, 1] = 0, 0\r\n<\/pre>\n<p>\u6700\u540e\u4e00\u4e2a0,0\u8fd9\u4e2a\u7ed3\u679c\u5728TSO\u6a21\u578b\u4e2d\u662f\u4e0d\u4f1a\u53d1\u751f\u7684\uff0c\u56e0\u4e3a\u65e0\u8bba\u4e24\u4e2acpu\u770b\u5230\u7684\u5199\u987a\u5e8f\u662fmem[0]\u5148\u5199\u8fd8\u662fmem[1]\u5148\u5199\uff0c \u4e24\u4e2acpu\u770b\u5230\u7684\u5199\u7684\u987a\u5e8f\u662f\u4e00\u6837\u7684\uff0c\u56e0\u6b64\uff0c\u4e5f\u5c31\u4e00\u5b9a\u4f1a\u6709\u4e00\u4e2acpu\u8bfb\u5230\u7684\u6570\u636e\u4e0d\u53ef\u80fd\u662f0\u3002<\/p>\n<p>TSO\u6a21\u578b\u76f8\u5bf9\u4e8eWMO\u5728\u4e00\u5b9a\u7a0b\u5ea6\u4e0a\u80fd\u7b80\u5316\u7a0b\u5e8f\u7684\u590d\u6742\u6027\uff0c\u4f46\u51e1\u4e8b\u6709\u5229\u5c31\u6709\u5f0a\uff0c TSO\u4fdd\u8bc1\u5199\u987a\u5e8f\uff0c\u662f\u6709\u6210\u672c\u7684\uff1a\u5f88\u591a\u5b9e\u73b0\u662f\u5728\u6bcf\u4e2a\u5185\u5b58\u4f7f\u7528\u8005\uff08\u6bd4\u5982CPU\uff09\u4e0a\u8bbe\u8ba1\u4e00\u4e2a\u5199\u64cd\u4f5cFIFO\uff0c \u6240\u6709\u7684\u5199\u64cd\u4f5c\u90fd\u9700\u8981\u8fdb\u884c\u6392\u961f\uff0c\u800c\u8bfb\u64cd\u4f5c\u5219\u9700\u8981\u5148\u4eceFIFO\u4e0a\u770b\u6709\u6ca1\u6709\u91cd\u53e0\u64cd\u4f5c\uff0c\u7136\u540e\u518d\u5230\u603b\u7ebf\u5916\u53d6\u5f97 \u6570\u636e\uff0c\u8fd9\u4e2d\u95f4\u5b58\u5728\u4e00\u4e2a\u5916\u90e8\u7684\u5bf9\u9f50\u70b9\uff0c\u8bfb\u64cd\u4f5c\u9700\u8981\u4fdd\u8bc1\u5728\u8fd9\u4e2a\u5bf9\u9f50\u70b9\u4e0a\u540c\u6b65\u6570\u636e\uff1a<\/p>\n<div><img decoding=\"async\" src=\"https:\/\/gitee.com\/Kenneth-Lee-2012\/know_modern_server_from_kunpeng920_pub\/raw\/pub\/source\/%E8%AE%A1%E7%AE%97%E5%AD%90%E7%B3%BB%E7%BB%9F\/tso_stall.svg\" \/><\/div>\n<p>TSO\u5728\u7f16\u7a0b\u4e0a\u66f4\u7b80\u5355\uff0c\u56e0\u4e3a\u6211\u4eec\u4e00\u5f00\u59cb\u8c08\u5230\u7684\u7ed9mem[]\u5199VALID\u7684\u65b9\u6cd5\u4e0d\u9700\u8981\u589e\u52a0\u4efb\u4f55\u989d\u5916 \u7684\u903b\u8f91\u5c31\u53ef\u4ee5\u5b9e\u73b0\uff0c\u4f46\u786c\u4ef6\u8fdb\u884c\u7684\u4fdd\u5e8f\uff0c\u5982\u679c\u4f60\u4e0d\u9700\u8981\uff0c\u6709\u4e9b\u573a\u666f\u662f\u4f1a\u5f71\u54cd\u6027\u80fd\u7684\u3002<\/p>\n<p>\u53e6\u4e00\u79cd\u5e38\u89c1\u7684\u65b9\u6cd5\u662f\u786c\u4ef6\u4e0d\u518d\u505a\u8fd9\u4e48\u591a\u7684\u5224\u65ad\u7684\uff0c\u5982\u679c\u8f6f\u4ef6\u6709\u8fd9\u79cd\u987a\u5e8f\u4f9d\u8d56\u5173\u7cfb\uff0c\u81ea\u5df1\u4e3b \u52a8\u6307\u5b9a\u5c31\u597d\u4e86\u3002\u8fd9\u79cd\u65b9\u6cd5\u5c31\u7b80\u5355\u79f0\u4e3aWeak Memory Ordering\u3002\u9cb2\u9e4f920\uff0cARMv8\u91c7\u7528\u7684\u5c31\u662f \u8fd9\u79cd\u5185\u5b58\u6a21\u578b\u3002\u8fd9\u79cd\u6a21\u578b\u901a\u8fc7\u989d\u5916\u7684\u201c\u6805\u680f\u201d\u6307\u4ee4\u4fdd\u8bc1\u987a\u5e8f\u3002<\/p>\n<div><img decoding=\"async\" src=\"https:\/\/gitee.com\/Kenneth-Lee-2012\/know_modern_server_from_kunpeng920_pub\/raw\/pub\/source\/%E8%AE%A1%E7%AE%97%E5%AD%90%E7%B3%BB%E7%BB%9F\/wmo_stall.svg\" \/><\/div>\n<p>\u5728\u6ca1\u6709\u987a\u5e8f\u8981\u6c42\u7684\u65f6\u5019\uff0c\u5185\u5b58\u8bf7\u6c42\u53ef\u4ee5\u4efb\u610f\u53d1\u5c04\uff0c\u4e5f\u4e0d\u9700\u8981\u4fdd\u6301\u540c\u6b65\u3002\u76f4\u5230\u4f60\u786e\u5b9e\u9700\u8981\u4fdd \u8bc1\u67d0\u4e2a\u987a\u5e8f\u7684\u65f6\u5019\uff0c\u4f60\u624d\u9700\u8981\u7528\u6805\u680f\u6307\u4ee4\u7b49\u5f85\u524d\u9762\u7684\u7279\u5b9a\u64cd\u4f5c\u5168\u90e8\u8fdb\u5165\u540c\u6b65\u70b9\u3002\u8fd9\u6837\u660e\u663e \u66f4\u5bb9\u6613\u63a7\u5236\u6574\u4e2a\u901a\u8baf\u8fc7\u7a0b\uff0c\u4f46\u8f6f\u4ef6\u5c31\u8981\u591a\u505a\u4e00\u4e9b\u5de5\u4f5c\u4e86\u3002\u5bf9\u4e8e\u4e0a\u9762\u7684mem[]\u7684\u7a0b\u5e8f\uff0c\u4ee3\u7801 \u5fc5\u987b\u8fd9\u6837\u5199\uff1a<\/p>\n<pre lang=\"c\">mem[0] = xxx;\r\nmem[1] = xxx;\r\n...\r\n\r\nmem_write_barrier();\r\nmem[17] = VALID;\r\n<\/pre>\n<p>mem_write_barrier()\u62e6\u4f4f\u4e4b\u524d\u53d1\u5c04\u7684\u6240\u6709\u5199\u6307\u4ee4\uff0c\u5f53\u8fd9\u4e9b\u64cd\u4f5c\u90fd\u7ed3\u675f\u540e\uff08\u4e5f\u5c31\u662f\u4ed6\u4eec\u7684 \u7ed3\u679c\u88ab\u6240\u6709\u5185\u5b58\u7684\u8bbf\u95ee\u8005\u90fd\u201c\u770b\u89c1\u201d\u4ee5\u540e\uff09\uff0c\u6805\u680f\u6307\u4ee4\u624d\u4f1a\u7ed3\u675f\u3002\u8fd9\u662f\uff0c\u5982\u679c\u6709\u4eba\u770b\u89c1 mem[17]\u53d8\u6210VALID\u4e86\uff0cmem[0]\u5230mem[16]\u7684\u5185\u5bb9\u4e00\u5b9a\u662f\u4e4b\u524d\u5199\u7684\u5185\u5bb9\u3002<\/p>\n<p>ARMv8\u7684\u4e3b\u8981\u7684\u6805\u680f\u6307\u4ee4\u662fDMB\u548cDSB\uff0c\u4e24\u8005\u529f\u80fd\u76f8\u4f3c\uff0c\u5728ARMv8\u7684\u6784\u67b6\u5b9a\u4e49\u4e2d\u53ea\u662f\u8bf4\uff0c\u540e\u8005 \u662f\u4e00\u4e2a\u66f4\u5f3a\u529b\u7684\u6805\u680f\uff0c\u4f1a\u628a\u4e00\u4e9b\u7cfb\u7edf\u884c\u4e3a\u8003\u8651\u5728\u5185\u3002\u5728\u9cb2\u9e4f920\u7684\u5b9e\u73b0\u4e2d\uff0c\u540e\u8005\u4f1a\u540c\u65f6\u62e6 \u4f4f\u6bd4\u5982tlbi\u8fd9\u6837\u7684\u64cd\u4f5c\uff0c\u4fdd\u8bc1\u5982\u679c\u66f4\u65b0\u4e86\u9875\u8868\uff0c\u8fd9\u4e9b\u66f4\u65b0\u4e5f\u4f1a\u5728DSB\u4e4b\u540e\u751f\u6548\u3002\u800cDMB\u5219\u4e0d \u4f1a\u8003\u8651\u8fd9\u6837\u7684\u8981\u7d20\u3002<\/p>\n<p>DMB\/DSB\u7684\u53c2\u6570\u4e3b\u8981\u7528\u4e8e\u63a7\u5236\u6805\u680f\u7684\u8303\u56f4\uff1a<\/p>\n<ul>\n<li>\u62e6\u8bfb\u8fd8\u662f\u62e6\u5199\uff0c\u8fd8\u662f\u4e24\u8005\u90fd\u62e6\uff08\u6bd4\u5982ST, LD\u6807\u8bb0\uff09<\/li>\n<li>\u5185\u5b58\u7684\u8303\u56f4\uff0c\u662f\u5426\u5305\u542b\u8bbe\u5907\u5730\u5740\u7a7a\u95f4\uff08\u6bd4\u5982NSH\uff09<\/li>\n<li>\u540c\u6b65\u7684\u5bf9\u8c61\u8303\u56f4\uff0c\u6bd4\u5982\u4ec5\u4ec5\u5305\u62ecSMP\u7684CPU\uff08\u6bd4\u5982ISH\uff0cOSH\uff09<\/li>\n<li>\u7b49\u7b49<\/li>\n<\/ul>\n<p>Linux\u5185\u6838\u5bf9\u8fd9\u4e2a\u8bed\u4e49\u5c01\u88c5\u6210\u8fd9\u6837\u7684\u8bed\u4e49\u4e86\uff1a:<\/p>\n<pre>mb();           \/\/ \u8bfb\u5199\u6805\u680f\r\nrmb();          \/\/ \u8bfb\u6805\u680f\r\nwmb();          \/\/ \u5199\u6805\u680f\r\nsmp_mb();       \/\/ \u4ec5\u4f5c\u7528\u5728CPU\u4e4b\u95f4\u7684\u8bfb\u5199\u6805\u680f\r\nsmp_rmb();      \/\/ \u4ec5\u4f5c\u7528\u5728CPU\u4e4b\u95f4\u7684\u8bfb\u6805\u680f\r\nsmp_wmb();      \/\/ \u4ec5\u4f5c\u7528\u5728CPU\u4e4b\u95f4\u7684\u5199\u6805\u680f\r\n<\/pre>\n<p>\u4e00\u822c\u7684\u5185\u6838\u4ee3\u7801\uff0c\u53ea\u5de5\u4f5c\u5728\u8fd9\u4e2a\u8bed\u4e49\u4e0a\u5c31\u53ef\u4ee5\u4e86\u3002\u5982\u679c\u662fIO\uff0cLinux\u8fd8\u6709\u8fd9\u6837\u7684\u5c01\u88c5\uff08X\u662f \u8bfb\u5199\u7684\u957f\u5ea6\u6807\u8bc6\uff09\uff1a:<\/p>\n<pre>writeX_relaxed();       \/\/ \u7b80\u5355\u5199\r\nwriteX();               \/\/ \u5199\u6805\u680f\u540e\u518d\u5199\r\nreadX_relaxed();        \/\/ \u7b80\u5355\u8bfb\r\nreadX();                \/\/ \u8bfb\u540e\u52a0\u8bfb\u6805\u680f\r\n<\/pre>\n<p>\u8fd9\u6837\u524d\u9762mem\u4f8b\u5b50\u5c31\u53ef\u4ee5\u5199\u6210\u8fd9\u6837\u4e86\uff1a<\/p>\n<pre lang=\"c\">writeX_relaxed(&amp;mem[0], xxx);\r\nwriteX_relaxed(&amp;mem[1], xxx);\r\n...\r\nwriteX(&amp;mem[17], VALID);\r\n<\/pre>\n<p>\u5728\u7528\u6237\u6001\uff0c\u5982\u679c\u6211\u4eec\u57fa\u4e8e\u6807\u51c6\u7684\u7cfb\u7edf\u5e93\u7f16\u7a0b\uff0c\u8fd9\u79cd\u95ee\u9898\u4e0d\u9700\u8981\u7279\u522b\u8003\u8651\uff0c\u56e0\u4e3a\u5982\u679c\u4f60\u8981\u5171 \u4eab\u6570\u636e\uff0c\u672c\u6765\u5c31\u5e94\u8be5\u7528\u9501\u5bf9\u5171\u4eab\u6570\u636e\u8fdb\u884c\u4fdd\u62a4\uff0c\u8fd9\u4e2a\u9501\u64cd\u4f5c\u672c\u8eab\u5c31\u80fd\u4fdd\u8bc1\u7a0b\u5e8f\u7684\u987a\u5e8f\u8bed\u4e49 \u5f97\u5230\u4fdd\u8bc1\u3002\u9664\u975e\u4f60\u8981\u5199\u81ea\u5df1\u7684\u9501\u884c\u4e3a\uff0c\u8fd9\u65f6\u5c31\u9700\u8981\u7528\u6805\u680f\u6307\u4ee4\u6765\u5b9e\u73b0\u4f60\u7684\u610f\u56fe\u4e86\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u539f\u6587\u5730\u5740 &nbsp; \u6211\u4eec\u8fd9\u91cc\u8bf4\u7684\u5185\u5b58<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_container_layout":"default_layout","colormag_page_sidebar_layout":"default_layout","footnotes":""},"categories":[],"tags":[119],"class_list":["post-4836","post","type-post","status-publish","format-standard","hentry","tag-03-"],"_links":{"self":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/4836","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/comments?post=4836"}],"version-history":[{"count":0,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/4836\/revisions"}],"wp:attachment":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/media?parent=4836"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/categories?post=4836"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/tags?post=4836"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}