{"id":3301,"date":"2019-05-20T13:33:50","date_gmt":"2019-05-20T05:33:50","guid":{"rendered":"https:\/\/damogame.cn\/wordpress\/?p=3301"},"modified":"2019-05-20T13:33:50","modified_gmt":"2019-05-20T05:33:50","slug":"kcp%e4%bb%8b%e7%bb%8d","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/3301","title":{"rendered":"kcp\u4ecb\u7ecd"},"content":{"rendered":"<div class=\"article\">\n<div class=\"author\"><\/div>\n<div class=\"show-content\" data-note-content=\"\">\n<div class=\"show-content-free\">\n<p><a href=\"https:\/\/www.jianshu.com\/p\/28d4b02e7eb4\">\u539f\u6587\u5730\u5740<\/a><\/p>\n<p>&nbsp;<\/p>\n<p>1 \u7b80\u4ecb<\/p>\n<p>KCP\u662f\u4e00\u4e2a\u5feb\u901f\u53ef\u9760\u534f\u8bae\uff0c\u80fd\u4ee5\u6bd4 TCP\u6d6a\u8d3910%-20%\u7684\u5e26\u5bbd\u7684\u4ee3\u4ef7\uff0c\u6362\u53d6\u5e73\u5747\u5ef6\u8fdf\u964d\u4f4e 30%-40%\uff0c\u4e14\u6700\u5927\u5ef6\u8fdf\u964d\u4f4e\u4e09\u500d\u7684\u4f20\u8f93\u6548\u679c\u3002\u7eaf\u7b97\u6cd5\u5b9e\u73b0\uff0c\u5e76\u4e0d\u8d1f\u8d23\u5e95\u5c42\u534f\u8bae\uff08\u5982UDP\uff09\u7684\u6536\u53d1\uff0c\u9700\u8981\u4f7f\u7528\u8005\u81ea\u5df1\u5b9a\u4e49\u4e0b\u5c42\u6570\u636e\u5305\u7684\u53d1\u9001\u65b9\u5f0f\uff0c\u4ee5 callback\u7684\u65b9\u5f0f\u63d0\u4f9b\u7ed9 KCP\u3002 \u8fde\u65f6\u949f\u90fd\u9700\u8981\u5916\u90e8\u4f20\u9012\u8fdb\u6765\uff0c\u5185\u90e8\u4e0d\u4f1a\u6709\u4efb\u4f55\u4e00\u6b21\u7cfb\u7edf\u8c03\u7528\u3002<\/p>\n<p>2 \u6280\u672f\u7279\u6027<\/p>\n<p>TCP\u662f\u4e3a\u6d41\u91cf\u8bbe\u8ba1\u7684\uff08\u6bcf\u79d2\u5185\u53ef\u4ee5\u4f20\u8f93\u591a\u5c11KB\u7684\u6570\u636e\uff09\uff0c\u8bb2\u7a76\u7684\u662f\u5145\u5206\u5229\u7528\u5e26\u5bbd\u3002\u800c KCP\u662f\u4e3a\u6d41\u901f\u8bbe\u8ba1\u7684\uff08\u5355\u4e2a\u6570\u636e\u5305\u4ece\u4e00\u7aef\u53d1\u9001\u5230\u4e00\u7aef\u9700\u8981\u591a\u5c11\u65f6\u95f4\uff09\uff0c\u4ee510%-20%\u5e26\u5bbd\u6d6a\u8d39\u7684\u4ee3\u4ef7\u6362\u53d6\u4e86\u6bd4 TCP\u5feb30%-40%\u7684\u4f20\u8f93\u901f\u5ea6\u3002TCP\u4fe1\u9053\u662f\u4e00\u6761\u6d41\u901f\u5f88\u6162\uff0c\u4f46\u6bcf\u79d2\u6d41\u91cf\u5f88\u5927\u7684\u5927\u8fd0\u6cb3\uff0c\u800cKCP\u662f\u6c34\u6d41\u6e4d\u6025\u7684\u5c0f\u6fc0\u6d41\u3002KCP\u6709\u6b63\u5e38\u6a21\u5f0f\u548c\u5feb\u901f\u6a21\u5f0f\u4e24\u79cd\uff0c\u901a\u8fc7\u4ee5\u4e0b\u7b56\u7565\u8fbe\u5230\u63d0\u9ad8\u6d41\u901f\u7684\u7ed3\u679c\uff1a<\/p>\n<p><b>RTO\u7ffb\u500dvs\u4e0d\u7ffb\u500d\uff1a<\/b><\/p>\n<p>TCP\u8d85\u65f6\u8ba1\u7b97\u662fRTOx2\uff0c\u8fd9\u6837\u8fde\u7eed\u4e22\u4e09\u6b21\u5305\u5c31\u53d8\u6210RTOx8\u4e86\uff0c\u5341\u5206\u6050\u6016\uff0c\u800cKCP\u542f\u52a8\u5feb\u901f\u6a21\u5f0f\u540e\u4e0dx2\uff0c\u53ea\u662fx1.5\uff08\u5b9e\u9a8c\u8bc1\u660e1.5\u8fd9\u4e2a\u503c\u76f8\u5bf9\u6bd4\u8f83\u597d\uff09\uff0c\u63d0\u9ad8\u4e86\u4f20\u8f93\u901f\u5ea6\u3002<\/p>\n<p><b>\u9009\u62e9\u6027\u91cd\u4f20 vs \u5168\u90e8\u91cd\u4f20\uff1a<\/b><\/p>\n<p>TCP\u4e22\u5305\u65f6\u4f1a\u5168\u90e8\u91cd\u4f20\u4ece\u4e22\u7684\u90a3\u4e2a\u5305\u5f00\u59cb\u4ee5\u540e\u7684\u6570\u636e\uff0cKCP\u662f\u9009\u62e9\u6027\u91cd\u4f20\uff0c\u53ea\u91cd\u4f20\u771f\u6b63\u4e22\u5931\u7684\u6570\u636e\u5305\u3002<\/p>\n<p><b>\u5feb\u901f\u91cd\u4f20\uff1a<\/b><\/p>\n<p>\u53d1\u9001\u7aef\u53d1\u9001\u4e861,2,3,4,5\u51e0\u4e2a\u5305\uff0c\u7136\u540e\u6536\u5230\u8fdc\u7aef\u7684ACK: 1, 3, 4, 5\uff0c\u5f53\u6536\u5230ACK3\u65f6\uff0cKCP\u77e5\u90532\u88ab\u8df3\u8fc71\u6b21\uff0c\u6536\u5230ACK4\u65f6\uff0c\u77e5\u90532\u88ab\u8df3\u8fc7\u4e862\u6b21\uff0c\u6b64\u65f6\u53ef\u4ee5\u8ba4\u4e3a2\u53f7\u4e22\u5931\uff0c\u4e0d\u7528\u7b49\u8d85\u65f6\uff0c\u76f4\u63a5\u91cd\u4f202\u53f7\u5305\uff0c\u5927\u5927\u6539\u5584\u4e86\u4e22\u5305\u65f6\u7684\u4f20\u8f93\u901f\u5ea6\u3002<\/p>\n<p><b>\u5ef6\u8fdfACK vs \u975e\u5ef6\u8fdfACK\uff1a<\/b><\/p>\n<p>TCP\u4e3a\u4e86\u5145\u5206\u5229\u7528\u5e26\u5bbd\uff0c\u5ef6\u8fdf\u53d1\u9001ACK\uff08NODELAY\u90fd\u6ca1\u7528\uff09\uff0c\u8fd9\u6837\u8d85\u65f6\u8ba1\u7b97\u4f1a\u7b97\u51fa\u8f83\u5927 RTT\u65f6\u95f4\uff0c\u5ef6\u957f\u4e86\u4e22\u5305\u65f6\u7684\u5224\u65ad\u8fc7\u7a0b\u3002KCP\u7684ACK\u662f\u5426\u5ef6\u8fdf\u53d1\u9001\u53ef\u4ee5\u8c03\u8282\u3002<\/p>\n<p><b>UNA vs ACK+UNA\uff1a<\/b><\/p>\n<p>ARQ\u6a21\u578b\u54cd\u5e94\u6709\u4e24\u79cd\uff0cUNA\uff08\u6b64\u7f16\u53f7\u524d\u6240\u6709\u5305\u5df2\u6536\u5230\uff0c\u5982TCP\uff09\u548cACK\uff08\u8be5\u7f16\u53f7\u5305\u5df2\u6536\u5230\uff09\uff0c\u5149\u7528UNA\u5c06\u5bfc\u81f4\u5168\u90e8\u91cd\u4f20\uff0c\u5149\u7528ACK\u5219\u4e22\u5931\u6210\u672c\u592a\u9ad8\uff0c\u4ee5\u5f80\u534f\u8bae\u90fd\u662f\u4e8c\u9009\u5176\u4e00\uff0c\u800c KCP\u534f\u8bae\u4e2d\uff0c\u9664\u53bb\u5355\u72ec\u7684 ACK\u5305\u5916\uff0c\u6240\u6709\u5305\u90fd\u6709UNA\u4fe1\u606f\u3002<\/p>\n<p><b>\u975e\u9000\u8ba9\u6d41\u63a7\uff1a<\/b><\/p>\n<p>KCP\u6b63\u5e38\u6a21\u5f0f\u540cTCP\u4e00\u6837\u4f7f\u7528\u516c\u5e73\u9000\u8ba9\u6cd5\u5219\uff0c\u5373\u53d1\u9001\u7a97\u53e3\u5927\u5c0f\u7531\uff1a\u53d1\u9001\u7f13\u5b58\u5927\u5c0f\u3001\u63a5\u6536\u7aef\u5269\u4f59\u63a5\u6536\u7f13\u5b58\u5927\u5c0f\u3001\u4e22\u5305\u9000\u8ba9\u53ca\u6162\u542f\u52a8\u8fd9\u56db\u8981\u7d20\u51b3\u5b9a\u3002\u4f46\u4f20\u9001\u53ca\u65f6\u6027\u8981\u6c42\u5f88\u9ad8\u7684\u5c0f\u6570\u636e\u65f6\uff0c\u53ef\u9009\u62e9\u901a\u8fc7\u914d\u7f6e\u8df3\u8fc7\u540e\u4e24\u6b65\uff0c\u4ec5\u7528\u524d\u4e24\u9879\u6765\u63a7\u5236\u53d1\u9001\u9891\u7387\u3002\u4ee5\u727a\u7272\u90e8\u5206\u516c\u5e73\u6027\u53ca\u5e26\u5bbd\u5229\u7528\u7387\u4e4b\u4ee3\u4ef7\uff0c\u6362\u53d6\u4e86\u5f00\u7740BT\u90fd\u80fd\u6d41\u7545\u4f20\u8f93\u7684\u6548\u679c\u3002<\/p>\n<p>3 \u534f\u8bae\u5b9a\u4e49<\/p>\n<p>3.1 kcp\u534f\u8bae<\/p>\n<p><b>type<\/b>\u00a0segment\u00a0<b>struct<\/b>\u00a0{<\/p>\n<p>\/\/ \u53d1\u9001\u7aef\u4e0e\u63a5\u6536\u7aef\u901a\u4fe1\u65f6\u7684\u5339\u914d\u6570\u5b57\uff0c\u53d1\u9001\u7aef\u53d1\u9001\u7684\u6570\u636e\u5305\u4e2d\u6b64\u503c\u4e0e\u63a5\u6536\u7aef\u7684conv\u503c\u5339\u914d\u4e00\u81f4\u65f6\uff0c\u63a5\u6536\u7aef\u624d\u4f1a\u63a5\u53d7\u6b64\u5305<\/p>\n<p>conv uint32<\/p>\n<p>\/\/ \u6539\u6570\u636e\u5305\u7684\u534f\u8bae\u53f7\uff0c\u534f\u8bae\u53f7\u6709\u4ee5\u4e0b\u679a\u4e3e\uff1a<\/p>\n<p>\/\/ IKCP_CMD_PUSH = 81 \/\/ cmd: push data\uff0c\u6570\u636e\u5305<\/p>\n<p>\/\/ IKCP_CMD_ACK = 82 \/\/ cmd: ack\uff0c\u786e\u8ba4\u5305\uff0c\u544a\u8bc9\u5bf9\u65b9\u6536\u5230\u6570\u636e\u5305<\/p>\n<p>\/\/ IKCP_CMD_WASK = 83 \/\/ cmd: window probe (ask)\uff0c\u8be2\u95ee\u8fdc\u7aef\u6ed1\u52a8\u7a97\u53e3\u7684\u5927\u5c0f<\/p>\n<p>\/\/ IKCP_CMD_WINS = 84 \/\/ cmd: window size (tell)\uff0c\u544a\u77e5\u8fdc\u7aef\u6ed1\u52a8\u7a97\u53e3\u7684\u5927\u5c0f<\/p>\n<p>cmd uint8<\/p>\n<p>\/\/ \u5206\u5e27\u53f7\uff0c\u7531\u4e8eudp\u4f20\u8f93\u6709\u6570\u636e\u5305\u5927\u5c0f\u7684\u9650\u5236\uff0c\u56e0\u6b64\uff0c\u5e94\u7528\u5c42\u4e00\u4e2a\u6570\u636e\u5305\u53ef\u80fd\u88ab\u5206\u4e3a\u591a\u4e2audp\u5305<\/p>\n<p>frg uint8<\/p>\n<p>\/\/ \u6ed1\u52a8\u7a97\u53e3\u7684\u5927\u5c0f<\/p>\n<p>\/\/ \u5f53Segment\u505a\u4e3a\u53d1\u9001\u6570\u636e\u65f6\uff0c\u6b64wnd\u4e3a\u672c\u673a\u6ed1\u52a8\u7a97\u53e3\u5927\u5c0f\uff0c\u7528\u4e8e\u544a\u8bc9\u8fdc\u7aef\u81ea\u5df1\u7a97\u53e3\u5269\u4f59\u591a\u5c11<\/p>\n<p>\/\/ \u5f53Segment\u505a\u4e3a\u63a5\u6536\u5230\u6570\u636e\u65f6\uff0c\u6b64wnd\u4e3a\u8fdc\u7aef\u6ed1\u52a8\u7a97\u53e3\u5927\u5c0f\uff0c\u672c\u673a\u77e5\u9053\u4e86\u8fdc\u7aef\u7a97\u53e3\u5269\u4f59\u591a\u5c11\u540e\uff0c\u53ef\u4ee5\u63a7\u5236\u81ea\u5df1\u63a5\u4e0b\u6765\u53d1\u9001\u6570\u636e\u7684\u5927\u5c0f<\/p>\n<p>wnd uint16<\/p>\n<p>\/\/ timestamp , \u5f53\u524dSegment\u53d1\u9001\u65f6\u7684\u65f6\u95f4\u6233<\/p>\n<p>ts uint32<\/p>\n<p>\/\/ Sequence Number,Segment\u6570\u636e\u5305\u7684\u7f16\u53f7<\/p>\n<p>sn uint32<\/p>\n<p>\/\/ una\u5373unacknowledged,\u672a\u786e\u8ba4\u6570\u636e\u5305\u7684\u7f16\u53f7\uff0c\u8868\u793a\u6b64\u7f16\u53f7\u524d\u7684\u6240\u6709\u5305\u90fd\u5df2\u6536\u5230\u4e86\u3002<\/p>\n<p>una uint32<\/p>\n<p>\/\/ rto\u5373Retransmission TimeOut\uff0c\u5373\u8d85\u65f6\u91cd\u4f20\u65f6\u95f4\uff0c\u5728\u53d1\u9001\u51fa\u53bb\u65f6\u6839\u636e\u4e4b\u524d\u7684\u7f51\u7edc\u60c5\u51b5\u8fdb\u884c\u8bbe\u7f6e<\/p>\n<p>rto uint32<\/p>\n<p>\/\/ \u57fa\u672c\u7c7b\u4f3c\u4e8eSegment\u53d1\u9001\u7684\u6b21\u6570\uff0c\u6bcf\u53d1\u9001\u4e00\u6b21\u4f1a\u81ea\u52a0\u4e00\u3002\u7528\u4e8e\u7edf\u8ba1\u8be5Segment\u88ab\u91cd\u4f20\u4e86\u51e0\u6b21\uff0c\u7528\u4e8e\u53c2\u8003\uff0c\u8fdb\u884c\u8c03\u8282<\/p>\n<p>xmit uint32<\/p>\n<p>\/\/ \u5373resend timestamp , \u6307\u5b9a\u91cd\u53d1\u7684\u65f6\u95f4\u6233\uff0c\u5f53\u5f53\u524d\u65f6\u95f4\u8d85\u8fc7\u8fd9\u4e2a\u65f6\u95f4\u65f6\uff0c\u5219\u518d\u91cd\u53d1\u4e00\u6b21\u8fd9\u4e2a\u5305\u3002<\/p>\n<p>resendts uint32<\/p>\n<p>\/\/ \u7528\u4e8e\u4ee5\u6570\u636e\u9a71\u52a8\u7684\u5feb\u901f\u91cd\u4f20\u673a\u5236\uff1b<\/p>\n<p>fastack uint32<\/p>\n<p>\/\/ len uint32 c++\u7248\u672c\u6709\u6570\u636e\u5305\u7684\u6570\u636e\u957f\u5ea6\uff0cgo\u7248\u672c\u65e0\u6b64\u5b57\u6bb5<\/p>\n<p>\/\/ \u534f\u8bae\u6570\u636e\u7684\u5177\u4f53\u5185\u5bb9<\/p>\n<p>data []byte<\/p>\n<p>}<\/p>\n<p>3.2 enet\u534f\u8bae\u5bf9\u6bd4<\/p>\n<p>typedef struct _ENetProtocolHeader<\/p>\n<p>{<\/p>\n<p>enet_uint16 peerID;<\/p>\n<p>enet_uint16 sentTime;<\/p>\n<p>} ENET_PACKED ENetProtocolHeader;<\/p>\n<p>typedef struct _ENetProtocolCommandHeader<\/p>\n<p>{<\/p>\n<p>enet_uint8 command;<\/p>\n<p>enet_uint8 channelID;<\/p>\n<p>enet_uint16 reliableSequenceNumber;<\/p>\n<p>} ENET_PACKED ENetProtocolCommandHeader;<\/p>\n<p>4 \u6d41\u7a0b\u56fe<\/p>\n<p>4.1 \u53d1\u9001\u6d41\u7a0b<\/p>\n<div class=\"image-package\">\n<div class=\"image-container\">\n<div class=\"image-container-fill\"><\/div>\n<div class=\"image-view\" data-width=\"516\" data-height=\"686\"><img decoding=\"async\" class=\"\" src=\"https:\/\/upload-images.jianshu.io\/upload_images\/14972009-53603e705ccdce32.jpg?imageMogr2\/auto-orient\/strip%7CimageView2\/2\/w\/516\/format\/webp\" data-original-src=\"\/\/upload-images.jianshu.io\/upload_images\/14972009-53603e705ccdce32.jpg\" data-original-width=\"516\" data-original-height=\"686\" data-original-format=\"image\/png\" data-original-filesize=\"39174\" \/><\/div>\n<\/div>\n<\/div>\n<p>4.2 \u63a5\u6536\u6d41\u7a0b<\/p>\n<div class=\"image-package\">\n<div class=\"image-container\">\n<div class=\"image-container-fill\"><\/div>\n<div class=\"image-view\" data-width=\"544\" data-height=\"706\"><img decoding=\"async\" class=\"\" src=\"https:\/\/upload-images.jianshu.io\/upload_images\/14972009-0c04ce609d9e760f.jpg?imageMogr2\/auto-orient\/strip%7CimageView2\/2\/w\/544\/format\/webp\" data-original-src=\"\/\/upload-images.jianshu.io\/upload_images\/14972009-0c04ce609d9e760f.jpg\" data-original-width=\"544\" data-original-height=\"706\" data-original-format=\"image\/png\" data-original-filesize=\"67738\" \/><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div id=\"free-reward-panel\" class=\"support-author\">\n<p>\u5c0f\u793c\u7269\u8d70\u4e00\u8d70\uff0c\u6765\u7b80\u4e66\u5173\u6ce8\u6211<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u539f\u6587\u5730\u5740 &nbsp; 1 \u7b80\u4ecb KCP<\/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":[118],"class_list":["post-3301","post","type-post","status-publish","format-standard","hentry","tag-02-"],"_links":{"self":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/3301","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=3301"}],"version-history":[{"count":0,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/posts\/3301\/revisions"}],"wp:attachment":[{"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/media?parent=3301"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/categories?post=3301"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/i007.cc\/wordpress\/wp-json\/wp\/v2\/tags?post=3301"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}