{"id":1410,"date":"2022-03-27T12:33:00","date_gmt":"2022-03-27T12:33:00","guid":{"rendered":"http:\/\/124.223.68.123\/?p=1410"},"modified":"2024-06-19T12:34:26","modified_gmt":"2024-06-19T12:34:26","slug":"ndpnew-datacenter-protocol%e6%96%b0%e6%95%b0%e6%8d%ae%e4%b8%ad%e5%bf%83%e4%bc%a0%e8%be%93%e5%8d%8f%e8%ae%ae%e8%a7%a3%e8%af%bb-%e4%b8%8a","status":"publish","type":"post","link":"https:\/\/www.zenosic.com\/en\/ndpnew-datacenter-protocol%e6%96%b0%e6%95%b0%e6%8d%ae%e4%b8%ad%e5%bf%83%e4%bc%a0%e8%be%93%e5%8d%8f%e8%ae%ae%e8%a7%a3%e8%af%bb-%e4%b8%8a\/","title":{"rendered":"NDP(New Datacenter Protocol)\u65b0\u6570\u636e\u4e2d\u5fc3\u4f20\u8f93\u534f\u8bae\u89e3\u8bfb-\u4e0a"},"content":{"rendered":"

\u524d\u8a00<\/strong><\/p>\n\n\n\n

\u7bc6\u82af\u667a\u80fd\u7f51\u7edc\u4ea4\u6362\u673a\u82af\u7247\uff0c\u4e0d\u4ec5\u652f\u6301\u4f20\u7edf\u7684\u5404\u79cd\u4f20\u8f93\u534f\u8bae\u529f\u80fd\u5916\uff0c\u8fd8\u5c06\u652f\u6301\u9488\u5bf9DPU\u548cAI\u52a0\u901f\u82af\u7247\u65b0\u4e00\u4ee3\u4e91\u6570\u636e\u4e2d\u5fc3\u9700\u6c42\u7684\u65b0\u6570\u636e\u4e2d\u5fc3\u4f20\u8f93\u534f\u8bae(NDP-New Datacenter Protocol)\u3002NDP\u4e0d\u4f46\u80fd\u591f\u5b8c\u5168\u53bb\u9664\u4f20\u7edf\u534f\u8bae\u7684\u5386\u53f2\u5305\u88b1\uff08\u5982TCP\u7684\u6162\u542f\u52a8\uff0c\u4f1a\u8bdd\u7684\u5efa\u7acb\u53ca\u62c6\u9664\uff09\uff0c\u8fd8\u80fd\u591f\u5728\u7f51\u7edc\u62e5\u585e\u7684\u60c5\u5f62\u4e0b\u63d0\u4f9b\u9ad8\u6548\u7684\u544a\u8b66\u53ca\u7f13\u89e3\u673a\u5236\uff0c\u8fdb\u800c\u6781\u5927\u5730\u964d\u4f4e\u6574\u4f53\u4ea4\u4e92\u65f6\u5ef6\u8fdb\u800c\u63d0\u9ad8\u6574\u4f53\u5e94\u7528\u7684\u6709\u6548\u6027\u3002<\/p>\n\n\n\n

\u8fd1\u65e5\uff0c\u7bc6\u82af\u534a\u5bfc\u4f53\uff0c\u4e91\u8c79\u667a\u80fd\u4e0e\u71e7\u539f\u79d1\u6280\u4e09\u5bb6\u516c\u53f8\u8fbe\u6210\u6218\u7565\u5408\u4f5c\uff0c\u4f9d\u6258\u4e09\u65b9\u5404\u81ea\u5728\u9ad8\u7aef\u6570\u901a\u7f51\u7edc\u82af\u7247\uff0cDPU\u548cAI\u8ba1\u7b97\u9886\u57df\u7684\u8f6f\u786c\u4ef6\u4f18\u52bf\uff0c\u8054\u5408\u5f00\u53d1\u57fa\u4e8e\u667a\u80fd\u7f51\u7edc\u57fa\u7840\u67b6\u6784\u7684\u5927\u89c4\u6a21\u9ad8\u6027\u80fdAI\u7b97\u529b\u5e73\u53f0\uff0c\u4e3a\u4e91\u7aefAI\u8ba1\u7b97\u63d0\u4f9b\u66f4\u9ad8\u6548\u7684\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n\n\n\n

\"e51c0b0aca56253c0847bf6ddd1feedd\"<\/figure>\n\n\n\n

\u76ee\u524d\u8f83\u4e3a\u5168\u9762\u7684\u8ba8\u8bbaNDP\u7684\u6587\u732e\u4e3a\uff1a<\/p>\n\n\n\n

M. Handley, C. Raiciu, A. Agache, A. Voinescu, A. W.Moore, G. Antichik, and M. Mojcik. Re-architecting Datacenter Networks andStacks for Low Latency and High Performance. In Proceedings of the ACM SIGCOMM2017 Conference, SIGCOMM \u201917, pages 29\u201342, New York, NY, USA, 2017.ACM.<\/p>\n\n\n\n

\u9274\u4e8eNDP\u662f\u8f83\u4e3a\u524d\u6cbf\u7684\u7f51\u7edc\u65b0\u6280\u672f\uff0c\u672c\u6587\u5c06\u5bf9\u8be5\u8bba\u6587\u8fdb\u884c\u89e3\u8bfb\u3002<\/p>\n\n\n\n

\u6b63\u6587<\/strong><\/p>\n\n\n\n

\u672c\u8bba\u6587\u6240\u53d1\u751f\u7684\u573a\u666f\u662f\u5728\u6570\u636e\u4e2d\u5fc3\u5185\uff0c\u4e0d\u9002\u7528\u4e8e\u4e00\u822c\u7684\u4e92\u8054\u7f51\uff0c\u4e3b\u8981\u662f\u56e0\u4e3a\u4e92\u8054\u7f51\u5145\u6ee1\u592a\u591a\u672a\u77e5\u6027\u4e0e\u65e0\u6cd5\u638c\u63a7\u7684\u88c5\u7f6e\uff0c\u8b6c\u5982\u6bcf\u6761\u94fe\u8def\u7684\u5e26\u5bbd, \u4ea4\u6362\u673a\u7684\u914d\u7f6e\u7b49\u3002\u6709\u8fd9\u4e9b\u672a\u77e5\u7684\u60c5\u51b5\u4e0b\uff0c\u65e0\u6cd5\u8bbe\u8ba1\u4e00\u4e2a\u597d\u7684\u8fd0\u4f5c\u6a21\u5f0f\u6765\u6ee1\u8db3\u4f4e\u5ef6\u8fdf\u4e0e\u9ad8\u8f6c\u53d1\u7387\u7684\u9700\u6c42\u3002\u56e0\u6b64\u73af\u5883\u90fd\u53ea\u8003\u8651\u6570\u636e\u4e2d\u5fc3\u3002<\/p>\n\n\n\n

\u8bba\u6587\u63d0\u51fa\u4e86NDP(New Datacenter ProtocolArchitecture)\u6982\u5ff5\uff0c\u5176\u5177\u4f53\u76ee\u6807\uff0c\u8bc4\u6bd4\u5bf9\u8c61\u4ee5\u53ca\u5b9e\u4f5c\u65b9\u6cd5\u5982\u4e0b\u3002<\/p>\n\n\n\n

\u8bba\u6587\u8bbe\u5b9a\u76ee\u6807\uff1a<\/p>\n\n\n\n

\u5bf9\u4e8eshort-flow\u6709\u5c3d\u91cf\u4f4e\u7684\u5ef6\u8fdf<\/p>\n\n\n\n

\u5bf9\u4e8elong-flow\u6709\u5c3d\u91cf\u9ad8\u7684\u8f6c\u53d1\u7387<\/p>\n\n\n\n

\u5728\u9ad8\u8d1f\u8377\u7f51\u7edc\u4e2d\uff0c\u5229\u7528\u7f51\u7edc\u62d3\u6251\u94fe\u8def\u6765\u4f20\u8f93\u62a5\u6587<\/p>\n\n\n\n

\u5c06incast\u60c5\u51b5\u5bf9\u7f51\u7edc\u9020\u6210\u7684\u5f71\u54cd\u964d\u5230\u6700\u5c0f<\/p>\n\n\n\n

\u8bba\u6587\u7814\u7a76\u5bf9\u8c61\uff1a<\/strong><\/p>\n\n\n\n

DCTCP(Datacenter TCP)<\/p>\n\n\n\n

MPTCP(Multi Path TCP)<\/p>\n\n\n\n

DCQCN(Datacenter QCN)<\/p>\n\n\n\n

\u8bba\u6587\u5b9e\u73b0\u65b9\u6cd5\uff1a<\/strong><\/p>\n\n\n\n

\u7528DPDK\u5f00\u53d1NDP   Application (\u629b\u5f03 TCP, \u91cd\u65b0\u5f00\u53d1L4\u534f\u8bae)<\/p>\n\n\n\n

\u4ece\u786c\u4ef6\u65b9\u9762\uff0c\u5728NetFPGA SUME\u4e0a\u5f00\u53d1NDP\u76f8\u5173\u529f\u80fd<\/p>\n\n\n\n

\u4ece\u8f6f\u4ef6\u65b9\u9762\uff0c\u5728P4\u4e0a\u5f00\u53d1NDP\u76f8\u5173\u529f\u80fd<\/p>\n\n\n\n

\u6458\u8981<\/strong><\/p>\n\n\n\n

\u8fd1\u5e74\u6765\u6570\u636e\u4e2d\u5fc3\u84ec\u52c3\u53d1\u5c55\uff0c\u4e3a\u4e86\u80fd\u591f\u5728\u5185\u90e8\u63d0\u4f9b\u66f4\u826f\u597d\u7684\u7f51\u7edc\u6548\u80fd\uff0c\u4e0d\u8bba\u662f\u4f4e\u5ef6\u8fdf\u6216\u662f\u9ad8\u8f93\u51fa\uff0c\u7f51\u7edc\u67b6\u6784\u4ece\u65e9\u671f\u7684\u4e09\u5c42\u5f0f\u4f53\u7cfb\u7ed3\u6784(Fat tree)\u9010\u6e10\u90fd\u8f6c\u6362\u6210Clos\u67b6\u6784\uff0c\u7136\u800c\u4f20\u7edf\u7684TCP\u534f\u8bae\u5728\u8bbe\u8ba1\u4e0a\u5e76\u4e0d\u662f\u9488\u5bf9\u6570\u636e\u4e2d\u5fc3\u8bbe\u8ba1\u7684\uff0c\u6545\u5176\u8bbe\u8ba1\u539f\u7406\u5bfc\u81f4\u5176\u4e0d\u80fd\u6ee1\u8db3\u9700\u6c42\u3002
\u56e0\u6b64\u8bba\u6587\u63d0\u51fa\u4e86NDP (new data-center transport architecture)\uff0c\u5176\u80fd\u591f\u63d0\u4f9b short transfer\u63a5\u8fd1\u5b8c\u7f8e\u7684\u4f20\u8f93\u65f6\u95f4\uff0c\u540c\u65f6\u5bf9\u4e8e\u5e7f\u6cdb\u7684\u5e94\u7528\u60c5\u51b5\uff0c\u5982Incast\u4e0b\u4ea6\u80fd\u591f\u63d0\u4f9b\u5f88\u9ad8\u7684\u4f20\u8f93\u6548\u80fd\u3002
NDP\u67b6\u6784\u4e0b\uff0c\u4ea4\u6362\u673a\u91c7\u7528\u6d45\u7f13\u5b58\u6765\u5b58\u653e\u62a5\u6587\uff0c\u5f53\u7f13\u5b58\u6ee1\u8f7d\u65f6\uff0c\u4e0d\u540c\u4e8e\u4f20\u7edf\u7684\u5c06\u62a5\u6587\u4e22\u5f03\u7684\u505a\u6cd5\uff0cNDP\u91c7\u53d6\u7684\u662f\u622a\u65ad\u62a5\u6587\u7684\u5185\u5bb9(payload)\uff0c\u53ea\u4fdd\u7559\u8be5\u62a5\u6587\u7684\u5305\u5934\uff0c\u5e76\u4e14\u5c06\u6b64\u62a5\u6587\u8bbe\u5b9a\u4e3a\u9ad8\u4f18\u5ea6\u4f18\u5148\u8f6c\u53d1\u3002\u8fd9\u79cd\u4f5c\u6cd5\u8ba9\u63a5\u6536\u7aef\u80fd\u591f\u6709\u66f4\u5b8c\u6574\u5173\u4e8e\u8f6c\u53d1\u7aef\u7684\u4fe1\u606f\uff0c\u80fd\u591f\u52a8\u6001\u7684\u8c03\u6574\u4f20\u8f93\u901f\u5ea6\u3002
\u8bba\u6587\u5c06NDP\u6982\u5ff5\u548c\u8f6f\u4ef6\uff0c\u786c\u4ef6\u76f8\u7ed3\u5408\u3002\u4f7f\u7528\u7684\u6280\u672f\u4e0e\u786c\u4ef6\u5206\u522b\u5305\u542b\u4e86 DPDK\u3001P4 \u4ee5\u53ca NetFPGA\u3002
\u6700\u540e\u8bba\u6587\u8fdb\u884c\u4e86\u4e00\u7cfb\u5217\u6548\u80fd\u8bc4\u6bd4\uff0c\u7528\u5927\u89c4\u6a21\u7684\u6a21\u62df\u8bc1\u660e\u4e86NDP\u80fd\u591f\u4e3a\u6574\u4e2a\u6570\u636e\u4e2d\u5fc3\u63d0\u4f9b\u4f4e\u5ef6\u8fdf\u4e0e\u9ad8\u8f93\u51fa\u7684\u7279\u6027\u3002<\/p>\n\n\n\n

\u4ecb\u7ecd<\/strong><\/p>\n\n\n\n

\u968f\u7740\u6570\u636e\u4e2d\u5fc3\u7206\u70b8\u6027\u7684\u6210\u957f\uff0c\u4e3a\u4e86\u6ee1\u8db3\u5176\u5185\u90e8\u4f20\u8f93\u7684\u9700\u6c42(\u4f4e\u5ef6\u8fdf\/\u9ad8\u8f93\u51fa)\uff0c\u6709\u5404\u5f0f\u5404\u6837\u7684\u65b0\u65b9\u6cd5\u6216\u662f\u5728\u65e7\u6709\u6280\u672f\u7684\u6539\u8fdb\u7528\u6765\u6ee1\u8db3\u4e0a\u8ff0\u9700\u6c42\u3002\u8b6c\u5982TCP\u6539\u8fdb\u7684 DCTPC\u3001\u672c\u6765\u5c31\u5b58\u5728\u5df2\u4e45\u7684MPTCP\u751a\u81f3\u662fRDMA(RoCE)\u3002\u5728RDMA\u7f51\u7edc\u73af\u5883\u4e2d\uff0c\u4e3a\u4e86\u51cf\u5c11\u62a5\u6587\u4e22\u5f03\u5bf9\u6574\u4f53\u4f20\u8f93\u9020\u6210\u7684\u5f71\u54cd\uff0c\u90fd\u4f1a\u5c06\u6574\u4e2a\u7f51\u7edc\u4f20\u8f93\u6253\u9020\u6210\u65e0\u635f\u73af\u5883\uff0c\u4e3a\u4e86\u8fbe\u6210\u8be5\u76ee\u6807\uff0c\u53ef\u4ee5\u91c7\u7528Ethernet Flow Control\uff0c Explicit Congestion Notification(ECN)\u6216\u662fPriority Flow Control(PFC)\u3002\u5fae\u8f6f\u5728SIGCOMM 2016\u53d1\u4e86\u4e00\u7bc7\u5173\u4e8eRDMA+PFC\u95ee\u9898\u7684\u8bba\u6587\u3002\u5176\u8ba4\u4e3a\u867d\u7136 PFC\u53ef\u4ee5\u7528\u6765\u63a7\u5236\u8f6c\u53d1\u62a5\u6587\u7684\u901f\u7387\uff0c\u85c9\u6b64\u8fbe\u5230\u65e0\u635f\u7684\u7f51\u7edc\u73af\u5883\uff0c\u4f46\u662f\u4e00\u65e6\u6574\u4f53\u7f51\u7edc\u5904\u4e8e\u9ad8\u5ea6\u62e5\u585e\u7684\u60c5\u51b5\u65f6\uff0c\u6570\u636e\u62a5\u6587\u4e0ePFC\u63a7\u5236\u62a5\u6587\u5bf9\u5e26\u5bbd\u7684\u4e89\u593a\u4f1a\u4f7f\u6574\u4f53\u7f51\u7edc\u6ca1\u6709\u529e\u6cd5\u7ee7\u7eed\u63d0\u4f9b\u4f4e\u5ef6\u8fdf\u7684\u4f18\u70b9\uff0c\u6700\u540e\u7684\u7ed3\u8bba\u662f\uff1a\u201chow to achieve low network latency and high network throughput at the same time forRDMA is still an open problem.\u201c \u672c\u8bba\u6587\u63d0\u51fa\u4e86\u4e00\u4e2a\u4e0d\u540c\u4e0e\u4ee5\u5f80\u601d\u8def\u7684\u65b0\u534f\u8baeNDP\u6765\u6ee1\u8db3\u4e0a\u8ff0\u7684\u8981\u6c42\u3002
NDP\u4e0d\u540c\u4e8eTCP\uff0c\u4e0d\u9700\u8981\u5148\u901a\u8fc7\u4e09\u6b21\u63e1\u624b\u6765\u8fdb\u884c\u8fde\u63a5\u624d\u53ef\u4ee5\u4f20\u8f93\u62a5\u6587\uff0c\u540c\u65f6\u4e5f\u907f\u514d\u4e86TCP slow start \u673a\u5236\uff0c\u53ef\u4ee5\u8fde\u63a5\u4e00\u5f00\u59cb\u5c31\u91c7\u7528\u5168\u901f\u7684\u65b9\u5f0f\u53bb\u8f6c\u53d1\u62a5\u6587\u3002\u6b64\u5916\uff0cNDP\u91c7\u7528\u4e86per-packet multipath\u800c\u4e0d\u662fper-connection multipath \u7684\u65b9\u5f0f\uff0c\u540c\u65f6\u901a\u8fc7NDP\u534f\u8bae\u7684\u65b9\u5f0f\u907f\u514d\u8fde\u63a5\u4e2d\u62a5\u6587\u4e71\u5e8f\u6240\u4ea7\u751f\u7684\u95ee\u9898\u3002
\u5bf9\u4e8e\u652f\u6301NDP\u7684\u4ea4\u6362\u673a\u6765\u8bf4\uff0c\u91c7\u7528\u4e86\u7c7b\u4f3cCP(CutPayload)\u7684\u673a\u5236\uff0c\u5f53\u4ea4\u6362\u673a\u7f13\u5b58\u6ee1\u8f7d\u7684\u60c5\u51b5\u4e0b\uff0c\u5bf9\u4e8e\u63a5\u4e0b\u6765\u6536\u5230\u7684\u62a5\u6587\u4e0d\u4f1a\u76f4\u63a5\u4e22\u6389\uff0c\u800c\u662f\u4f1a\u5c06\u5176 Payload\u79fb\u9664\uff0c\u5e76\u4e14\u8bbe\u5b9a\u9ad8\u4f18\u5148\u5ea6\u7684\u65b9\u5f0f\u5c06\u5176\u5305\u5934\u5c3d\u53ef\u80fd\u5feb\u901f\u7684\u8f6c\u53d1\u5230\u76ee\u7684\u5730\uff0c\u8ba9\u63a5\u6536\u7aef\u80fd\u591f\u6709\u4fe1\u606f\u4e86\u89e3\u5230\u5f53\u524d\u7f51\u7edc\u4e0e\u8f6c\u53d1\u7aef\u7684\u72b6\u6001\u3002
\u901a\u8fc7CP\u673a\u5236\u53ef\u4ee5\u5bf9metadata\u8fbe\u5230\u8fd1\u4e4e\u65e0\u635f\u7684\u6548\u679c\uff0c\u4e0d\u8fc7\u5bf9\u4e8e\u6570\u636e\u6765\u8bf4\u5219\u6ca1\u6709\u529e\u6cd5\u3002\u7531\u4e8eNDP\u534f\u8bae\u672c\u8eab\u8bbe\u8ba1\u7684\u65b9\u5f0f\uff0c\u62a5\u6587\u4e22\u5f03\u6240\u4ea7\u751f\u7684\u5f71\u54cd\u5e76\u4e0d\u4f1a\u50cfTCP \u4e00\u6837\u6709\u5982\u6b64\u4e25\u91cd\u7684\u5f71\u54cd\u3002<\/p>\n\n\n\n

\u8bbe\u8ba1\u7a7a\u95f4<\/strong><\/p>\n\n\n\n

\u5bf9\u4e8e\u5185\u90e8\u4f7f\u7528\u7684\u6570\u636e\u4e2d\u5fc3\u800c\u8a00\uff0c\u5176\u7f51\u7edc\u6d41\u91cf\u5927\u90e8\u5206\u90fd\u662f\u5c5e\u4e8eRequest\/Reply,\u8fd9\u79cd\u7c7b\u4f3cRPC\u65b9\u5f0f\u7684\u6d41\u91cf\u3002\u8fd9\u610f\u5473\u8005\u4ee5\u7f51\u7edc\u4f7f\u7528\u7387\u6765\u770b\u5176\u4e0d\u4f1a\u4e00\u76f4\u5904\u5728\u6ee1\u8f7d\u7684\u72b6\u51b5\uff0c\u4f46\u662f\u5bf9\u8fde\u63a5\u63a5\u6536\u7aef\u7684\u5e94\u7528\u7a0b\u5e8f(\u5982\u670d\u52a1\u5668)\u6765\u8bf4\uff0c\u5176\u6240\u6536\u5904\u7406\u7684\u7f51\u7edc\u6d41\u91cf\u53ef\u80fd\u662f\u5927\u6570\u636e\u7684\u4f20\u8f93\uff0c\u4e5f\u53ef\u80fd\u662f\u7b80\u5355\u6570\u636e\u7684\u77ed\u6682\u8fde\u63a5\u3002\u5bf9\u4e8e\u77ed\u6682\u8fde\u63a5\u6765\u8bf4\uff0c\u6700\u5927\u7684\u91cd\u70b9\u5c31\u662f\u4f4e\u5ef6\u8fdf\uff0c\u5c3d\u53ef\u80fd\u5feb\u7684\u4f20\u8f93\u56de\u53bb\u3002
\u4e3a\u4e86\u5904\u7406\u8fd9\u4e2a\u95ee\u9898\uff0c\u76ee\u524d\u6709\u8bb8\u591a\u5e94\u7528\u7a0b\u5e8f\u91c7\u53d6reuse TCP\u8fde\u63a5\u6765\u5904\u7406\u591a\u4e2a\u8bf7\u6c42\uff0c\u4ee5\u6b64\u65b9\u5f0f\u51cf\u5c11TCP\u4e09\u6b21\u63e1\u624b\u6240\u4ea7\u751f\u7684\u5ef6\u8fdf\u3002\u7136\u800c\uff0c\u662f\u5426\u5b58\u5728\u4e00\u79cd\u67b6\u6784\uff0c\u4e0d\u8bba\u5f53\u524d\u6574\u4e2a\u7f51\u7edc\u7cfb\u7edf\u662f\u5426\u5904\u4e8e\u9ad8\u6d41\u91cf\u8d1f\u8f7d\uff0c\u8be5\u67b6\u6784\u80fd\u591f\u8ba9\u5e94\u7528\u7a0b\u5e8f\u4e0d\u9700\u8981\u91cd\u590d\u4f7f\u7528\u8fde\u63a5\uff0c\u8ba9\u6bcf\u4e2arequest\u90fd\u662f\u4e00\u6761\u5168\u65b0\u8fde\u63a5\uff0c\u540c\u65f6\u53c8\u80fd\u591f\u63a5\u8fd1\u5b8c\u7f8e\u7684\u5ef6\u8fdf(\u610f\u5473\u8005\u4e0d\u4f1a\u50cfTCP \u90fd\u8981\u5148\u7ecf\u8fc7\u4e09\u6b21\u63e1\u624b\u624d\u53ef\u4ee5\u5f00\u59cb\u4f20\u6570\u636e)\u3002\u4e8e\u662fNDP\u7684\u8bbe\u8ba1\u7406\u5ff5\u5c31\u51fa\u73b0\u4e86\uff0c\u4e3a\u4e86\u8fbe\u5230\u4e0a\u8ff0\u7684\u8981\u6c42\uff0c\u9996\u5148\u5fc5\u987b\u8981\u91cd\u65b0\u601d\u8003\uff0c\u5f53\u524d\u7f51\u7edc\u67b6\u6784\u4e2d\uff0c\u662f\u4ec0\u4e48\u56e0\u7d20\u963b\u788d\u4e86\u4e0a\u8ff0\u8981\u6c42\uff0c\u8fd9\u4e9b\u963b\u788d\u8be5\u5982\u4f55\u514b\u670d\u3002<\/p>\n\n\n\n

\u7aef\u5230\u7aef\u670d\u52a1\u8bf7\u6c42<\/p>\n\n\n\n

\u8bba\u6587\u5217\u51fa\u4e86\u5982\u4e0b\u6570\u636e\u4e2d\u5fc3\u5185\u5e94\u7528\u7a0b\u5e8f\u8981\u8ffd\u6c42\u7684\u7279\u6027\u3002<\/p>\n\n\n\n

\u4f4d\u7f6e\u72ec\u7acb<\/p>\n\n\n\n

\u5206\u5e03\u5f0f\u5e94\u7528\u7a0b\u5e8f\u8fd0\u884c\u4e8e\u6570\u636e\u4e2d\u5fc3\u5185\u7684\u4efb\u4e00\u673a\u5668\u4e0a\uff0c\u90fd\u4e0d\u5e94\u8be5\u8981\u5f71\u54cd\u5e94\u7528\u7a0b\u5e8f\u672c\u8eab\u7684\u529f\u80fd\u3002\u7531\u4e8e\u76ee\u524d\u90fd\u91c7\u7528Clos\u7f51\u7edc\u67b6\u6784\u6765\u8bbe\u8ba1\u7f51\u7edc\u62d3\u6251\uff0c\u6240\u4ee5\u6574\u4e2a\u7f51\u7edc\u62d3\u6251\u662f\u80fd\u591f\u63d0\u4f9b\u8db3\u591f\u7684\u6d41\u91cf\u6765\u4f7f\u7528\uff0c\u800c\u4e0d\u4f1a\u53d8\u6210\u4e00\u4e2a\u7406\u7531\u6216\u662f\u74f6\u9888\u4f7f\u5f97\u5e94\u7528\u7a0b\u5e8f\u5fc5\u987b\u8981\u9009\u62e9\u7279\u5b9a\u7684\u673a\u5668\u624d\u53ef\u4ee5\u8fd0\u884c\u3002<\/p>\n\n\n\n

\u4f4e\u5ef6\u8fdf<\/p>\n\n\n\n

\u867d\u7136 Clos\u7f51\u7edc\u67b6\u6784\u80fd\u591f\u63d0\u4f9b\u8db3\u591f\u7684\u5e26\u5bbd\u7ed9\u62d3\u6251\u5185\u7684\u670d\u52a1\u5668\uff0c\u5bf9\u4e8e\u6d41\u91cf\u7684\u8d1f\u8f7d\u5e73\u8861\u80fd\u63d0\u4f9b\u826f\u597d\u7684\u6548\u679c\uff0c\u4f46\u662f\u5bf9\u4e8e\u77ed\u6682\u8fde\u63a5\u6765\u8bf4\uff0c\u5e76\u6ca1\u6709\u529e\u6cd5\u63d0\u4f9b\u4f4e\u5ef6\u8fdf\u7684\u80fd\u529b\u3002
\u8bba\u6587\u8ba4\u4e3a\u867d\u7136\u80fd\u591f\u63d0\u4f9b\u9ad8\u6d41\u91cf\u8f93\u51fa\u662f\u4e00\u4e2a\u5f88\u91cd\u8981\u7684\u8bae\u9898\uff0c\u4f46\u662f\u80fd\u591f\u63d0\u4f9b\u4f4e\u5ef6\u8fdf\u7684\u80fd\u529b\u5219\u662f\u66f4\u91cd\u8981\u4e14\u4f18\u5148\u5ea6\u66f4\u9ad8\u3002<\/p>\n\n\n\n

Incast<\/strong><\/p>\n\n\n\n

Incast\u8fd9\u4e2a\u4e13\u6709\u540d\u8bcd\u7684\u4ecb\u7ecd\u53ef\u4ee5\u53c2\u8003Data Centersand TCP Incast – Georgia Tech – Network Congestion\uff0c\u7b80\u5355\u6765\u8bf4\u5c31\u662f\u540c\u65f6\u95f4\u6709\u5927\u91cf\u8bf7\u6c42\u8fdb\u5230\u6570\u636e\u4e2d\u5fc3\u5185\uff0c\u8fd9\u4e9b\u8bf7\u6c42\u90fd\u4f1a\u4ea7\u751f\u5bf9\u5e94\u7684reply\uff0c\u7136\u540e\u8fd9\u4e9breply\u8fde\u63a5\u540c\u65f6\u95f4\u4e00\u8d77\u8fdb\u5165\u5230\u4ea4\u6362\u673a\u5185\uff0c\u8fd9\u4f1a\u4f7f\u5f97\u4ea4\u6362\u673a\u7684\u7f13\u5b58\u533a\u7acb\u523b\u6ee1\u8f7d\u800c\u6ca1\u529e\u6cd5\u7ee7\u7eed\u627f\u53d7\u62a5\u6587\uff0c\u5bfc\u81f4\u90e8\u5206\u7684TCP\u8fde\u63a5\u9700\u8981\u964d\u901f\u91cd\u4f20\u3002
\u8bba\u6587\u8ba4\u4e3a\u4e00\u4e2a\u597d\u7684\u7f51\u7edc\u67b6\u6784\u9047\u5230\u8fd9\u79cd\u95ee\u9898\u65f6\uff0c\u5e94\u8be5\u8981\u80fd\u591f\u4fdd\u62a4\u540e\u53f0\u7684\u5e94\u7528\u7a0b\u5e8f\u8fde\u63a5\uff0c\u8ba9\u8fd9\u4e9b\u8fde\u63a5\u5e94\u8be5\u8981\u5c3d\u53ef\u80fd\u5730\u7ef4\u6301\u4f4e\u5ef6\u8fdf\u6027\u3002<\/p>\n\n\n\n

\u4f18\u5148\u7ea7<\/strong><\/p>\n\n\n\n

\u5047\u8bbe\u6709\u4e00\u5e94\u7528\u7a0b\u5e8f\uff0c\u540c\u65f6\u4f1a\u8f6c\u53d1\u4e0d\u540c\u7684\u8bf7\u6c42\u5230\u540e\u53f0\u53bb\u5904\u7406\uff0c\u800c\u8fd9\u4e9b\u8bf7\u6c42\u6240\u4ea7\u751f\u7684reply\u672c\u8eab\u662f\u6709\u4f9d\u8d56\u7684\u5173\u7cfb\u3002\u6240\u4ee5\u5047\u5982\u8fd9\u591a\u4e2areply\u6ca1\u6709\u4f9d\u7167\u5f53\u521d\u8f6c\u53d1\u8bf7\u6c42\u7684\u987a\u5e8f\u56de\u6765\u7684\u8bdd\uff0c\u5728\u5e94\u7528\u7a0b\u5e8f\u7aef\u5c31\u5fc5\u987b\u8981\u7279\u522b\u53bb\u5904\u7406\uff0c\u8b6c\u5982\u8bf4\u4e0d\u8981\u540c\u65f6\u9001\u591a\u4e2a\u8bf7\u6c42\uff0c\u4e0d\u8fc7\u8fd9\u6837\u5c31\u6ca1\u6709\u66f4\u597d\u7684\u6548\u80fd\u8868\u73b0\u3002\u56e0\u6b64\u5bf9\u4e8e\u5e94\u7528\u7a0b\u5e8f\u6765\u8bf4\uff0c\u82e5\u672c\u8eab\u80fd\u591f\u6709\u4e00\u4e2a\u4f18\u5148\u7ea7\u7684\u673a\u5236\uff0c\u80fd\u591f\u51b3\u5b9a\u54ea\u4e9b\u62a5\u6587\u8981\u5148\u5904\u7406\uff0c\u5c31\u53ef\u4ee5\u89e3\u51b3\u4e0a\u8ff0\u7684\u95ee\u9898\uff0c\u800c\u8ba9\u5e94\u7528\u7a0b\u5e8f\u672c\u8eab\u5c31\u53ef\u4ee5\u66f4\u81ea\u7531\u7684\u53bb\u5904\u7406\u3002<\/p>\n\n\n\n

\u4f20\u8f93\u534f\u8bae<\/strong><\/p>\n\n\n\n

\u76ee\u524d\u6570\u636e\u4e2d\u5fc3\u5185\u90e8\u91c7\u7528\u7684\u4f20\u8f93\u534f\u8bae\u867d\u7136\u53ef\u4ee5\u5904\u7406\u4e0a\u8ff0\u5e94\u7528\u7a0b\u5e8f\u7684\u95ee\u9898\uff0c\u4f46\u662f\u4e3a\u4e86\u5904\u7406\u90a3\u4e9b\u95ee\u9898\uff0c\u53cd\u800c\u4f1a\u5931\u53bb\u4e0b\u5217\u7279\u6027\u3002\u800cNDP\u672c\u8eab\u5728\u8bbe\u8ba1\u65f6\uff0c\u5e0c\u671b\u80fd\u591f\u5728\u6ee1\u8db3\u4e0a\u8ff0\u5e94\u7528\u7a0b\u5e8f\u7684\u9700\u6c42\uff0c\u540c\u65f6\u53c8\u4fdd\u6709\u4e0b\u5217\u7684\u7279\u6027\u3002<\/p>\n\n\n\n

Zero-RTT\u8fde\u63a5\u5efa\u7acb<\/p>\n\n\n\n

\u76ee\u524d\u4e3b\u6d41\u7684TCP\u534f\u8bae\u5728\u8f6c\u53d1\u6570\u636e\u524d\uff0c\u5fc5\u987b\u8981\u5148\u8fdb\u884c\u4e09\u6b21\u63e1\u624b\uff0c\u8fd9\u610f\u5473\u7740\u5f53\u6570\u636e\u9001\u51fa\u53bb\u524d\uff0c\u81f3\u5c11\u8981\u5148\u82b1\u8d39 RTT*3 \u7684\u7b49\u5f85\u65f6\u95f4\u3002\u5bf9\u4e8e\u4f4e\u5ef6\u8fdf\u7684\u5e94\u7528\u7a0b\u5e8f\u6765\u8bf4\uff0c\u5e0c\u671b\u80fd\u591f\u8fbe\u5230RTT*0\uff0c\u81f3\u5c11RTT*1\u7684\u7b49\u5f85\u65f6\u95f4\u5c31\u80fd\u591f\u5c06\u6570\u636e\u9001\u51fa\uff0c\u8fd9\u5bf9NDP\u6765\u8bf4\uff0c\u5728\u6570\u636e\u8f6c\u53d1\u524d\uff0c\u6574\u4e2a\u8fde\u63a5\u4e0d\u9700\u8981\u6709\u4e09\u6b21\u63e1\u624b\u7684\u52a8\u4f5c\uff0c\u4e00\u5f00\u59cb\u5c31\u76f4\u63a5\u9001\u51fa\u6570\u636e\u3002<\/p>\n\n\n\n

\u5feb\u542f\u52a8<\/p>\n\n\n\n

\u6570\u636e\u4e2d\u5fc3\u4e0d\u540c\u4e8e\u4e92\u8054\u7f51\u7684\u5730\u65b9\u5728\u4e8e\u7f51\u7edc\u62d3\u6251\u4e2d\u7684\u6bcf\u4e2a\u4ea4\u6362\u673a\u90fd\u662f\u81ea\u5df1\u638c\u63e1\u7684\u3002\u6240\u4ee5TCP\u91c7\u7528\u7684\u6162\u542f\u52a8SlowStart \u5176\u5b9e\u5bf9\u4e8e\u6570\u636e\u4e2d\u5fc3\u6765\u8bf4\u662f\u6ca1\u6709\u6548\u7387\u7684\uff0c\u6bd5\u7adf\u4e00\u5f00\u59cb\u77e5\u9053\u53ef\u7528\u5e26\u5bbd\u662f\u591a\u5c11\uff0c\u4e0d\u9700\u8981\u5982\u540c\u9762\u5bf9\u4e92\u8054\u7f51\u90a3\u6837\u7684\u60b2\u89c2\uff0c\u6162\u6162\u5730\u8c03\u6574\u7a97\u53e3\u5927\u5c0f\uff0c\u800c\u662f\u53ef\u4ee5\u4e00\u5f00\u59cb\u5c31\u4e50\u89c2\u7684\u8f6c\u53d1\u6700\u5927\u5355\u4f4d\uff0c\u518d\u6839\u636e\u72b6\u51b5\u8fdb\u884c\u5fae\u8c03\u3002\u82e5\u91c7\u53d6\u8fd9\u79cd\u673a\u5236\uff0c\u5219\u5e94\u7528\u7a0b\u5e8f\u53ef\u4ee5\u4f7f\u7528\u66f4\u5feb\u7684\u901f\u5ea6\u53bb\u8f6c\u53d1\u62a5\u6587\u3002<\/p>\n\n\n\n

Per-packet ECMP<\/strong><\/p>\n\n\n\n

\u5728Clos\u7f51\u7edc\u67b6\u6784\u4e2d\uff0c\u9519\u7efc\u590d\u6742\u7684\u8fde\u7ed3\u72b6\u6001\u63d0\u4f9b\u4e86Per-flow ECMP\u4e00\u4e2a\u5f88\u597d\u53d1\u6325\u7684\u573a\u6240\uff0c\u53ef\u4ee5\u8ba9\u4e0d\u540c\u7684\u8fde\u63a5\u8d70\u4e0d\u540c\u7684\u8def\u5f84\uff0c\u85c9\u6b64\u63d0\u9ad8\u6574\u4f53\u7f51\u7edc\u4f7f\u7528\u7387\u3002\u7136\u800c\u5982\u679cHash\u7684\u7ed3\u679c\u76f8\u540c\u7684\u8bdd\uff0c\u5176\u5b9e\u662f\u6709\u673a\u4f1a\u8ba9\u4e0d\u540c\u8fde\u63a5\u8d70\u76f8\u540c\u7684\u8def\u5f84\uff0c\u5373\u4f7f\u5176\u4ed6\u8def\u5f84\u5f53\u524d\u90fd\u662f\u95f2\u7f6e\u7684\u3002\u82e5\u91c7\u53d6MPTCP\u8fd9\u79cd\u53d8\u5316\u578b\u7684TCP\u6765\u5904\u7406\u7684\u8bdd\uff0c\u8be5\u534f\u8bae\u672c\u8eab\u7684\u8bbe\u8ba1\u53ef\u4ee5\u89e3\u51b3\u4e0a\u8ff0\u95ee\u9898\uff0c\u4f46\u662f\u5bf9\u4e8e\u77ed\u6682\u6d41\u91cf\u6216\u662f\u5ef6\u8fdf\u6027\u6765\u8bf4\uff0c\u5374\u6ca1\u6709\u5f88\u597d\u7684\u6548\u679c\u3002\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u53ef\u4ee5\u5c06Per-flow ECMP\u8f6c\u6362\u6210Per-Packet ECMP\u3002\u56e0\u6b64 NDP\u672c\u8eab\u534f\u8bae\u7684\u8bbe\u8ba1\u5c31\u662f\u4ee5Per-Packet ECMP\u4e3a\u4e3b\u7684\u3002<\/p>\n\n\n\n

Reorder-tolerant\u63e1\u624b<\/strong><\/p>\n\n\n\n

\u5047\u8bbe\u5df2\u7ecf\u6709\u4e86Zero RTT\u4ee5\u53caPer-packet ECMP\u4e24\u79cd\u7279\u6027\uff0c\u5219\u65b0\u8fde\u63a5\u7684\u62a5\u6587\u53ef\u80fd\u5c31\u4f1a\u53d1\u751f\u4e71\u5e8f\u7684\u60c5\u51b5\uff0c\u6536\u9001\u987a\u5e8f\u4e0d\u540c\u7684\u72b6\u51b5\u4e0b\uff0c\u82e5\u5bf9\u4e8eTCP\u6765\u8bf4\uff0c\u5c31\u4f1a\u89e6\u53d1\u62e5\u585e\u63a7\u5236\u7684\u673a\u5236\u8fdb\u800c\u5bfc\u81f4\u964d\u901f\u3002\u56e0\u6b64NDP\u5728\u8bbe\u8ba1\u65f6\uff0c\u5fc5\u987b\u8981\u80fd\u591f\u5904\u7406\u8fd9\u79cd\u72b6\u51b5\uff0c\u53ef\u4ee5\u5728\u4e0d\u4f9d\u8d56\u62a5\u6587\u5230\u8fbe\u5148\u540e\u987a\u5e8f\u4e0b\u53bb\u5904\u7406\u3002<\/p>\n\n\n\n

Optimized for Incast<\/strong><\/p>\n\n\n\n

\u5373\u4f7f\u6574\u4e2a\u6570\u636e\u4e2d\u5fc3\u7684\u7f51\u7edc\u73af\u5883\uff0c\u5982\u5e26\u5bbd\u7b49\u4fe1\u606f\u4e00\u5f00\u59cb\u5c31\u5df2\u7ecf\u53ef\u4ee5\u638c\u63e1\uff0c Incast\u95ee\u9898\u8fd8\u662f\u96be\u4ee5\u5904\u7406\uff0c\u6bd5\u7adf\u7f51\u7edc\u4e2d\u53d8\u5316\u592a\u591a\uff0c\u4e5f\u8bb8\u6709\u67d0\u4e9b\u5e94\u7528\u7a0b\u5e8f\u5c31\u7a81\u7136\u540c\u65f6\u5927\u91cf\u4ea7\u751f\u62a5\u6587\uff0c\u8fd9\u4e9b\u62a5\u6587\u540c\u65f6\u5230\u8fbe\u4ea4\u6362\u673a\u5c31\u53ef\u80fd\u5bfc\u81f4\u62a5\u6587\u88ab\u4e22\u5f03\u3002\u56e0\u6b64NDP\u672c\u8eab\u5728\u8bbe\u8ba1\u65f6\uff0c\u4e5f\u5e0c\u671b\u80fd\u591f\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u3002<\/p>\n\n\n\n

\u4ea4\u6362\u673a\u670d\u52a1\u6a21\u578b<\/strong><\/p>\n\n\n\n

\u5728\u6570\u636e\u4e2d\u5fc3\u5185\uff0c\u9664\u4e86\u5e94\u7528\u7a0b\u5e8f\u7279\u5b9a\uff0c\u4f20\u8f93\u5c42\u534f\u8bae\u4e4b\u5916\uff0c\u8fd8\u6709\u4e00\u4e2a\u7279\u6027\u4e5f\u662f\u5f88\u91cd\u8981\u7684\uff0c\u8fd9\u4e2a\u7279\u6027\u4e0e\u4e0a\u8ff0\u4e24\u4e2a\u7279\u6027\u5173\u7cfb\u7d27\u5bc6\uff0c\u4e00\u8d77\u5f71\u54cd\u6574\u4e2a\u7f51\u7edc\u7684\u8fd0\u4f5c\uff0c\u8fd9\u4e2a\u7279\u6027\u5c31\u662f\u4ea4\u6362\u673a\u670d\u52a1\u6a21\u578b\u3002\u8bba\u6587\u8ba4\u4e3a\u5728\u8fd9\u7279\u6027\u4e2d\uff0c\u6700\u91cd\u8981\u7684\u5c31\u662f\u5f53\u4ea4\u6362\u673a\u7aef\u53e3\u53d1\u751f\u963b\u585e\u65f6\u4f1a\u600e\u4e48\u5904\u7406\uff0c\u8fd9\u4e2a\u7279\u6027\u4f1a\u5f71\u54cd\u5230\u4f20\u8f93\u5c42\u534f\u8bae\u4ee5\u53ca\u62e5\u585e\u63a7\u5236\u7b97\u6cd5\u7684\u8bbe\u8ba1\uff0c\u751a\u81f3\u662f\u4f20\u8f93\u76f8\u5173\u7684\u7279\u6027\uff0c\u5982per-packet ECMP\u90fd\u53ef\u80fd\u4f1a\u88ab\u5f71\u54cd\u5230\u3002\u8bba\u6587\u6307\u51fa\uff0c\u76ee\u524d\u6709\u5f88\u591a\u79cd\u9884\u9632\u62e5\u585e\u7684\u673a\u5236\uff0c\u5982Loss as a congestion\uff0cDuplicate or selective Acks\u7b49\uff0c\u5176\u4e2dDuplicate or selective Acks\u4f1a\u4e3b\u52a8\u89e6\u53d1\u91cd\u4f20\uff0c\u8fd9\u79cd\u6280\u5de7\u5bf9\u4e8e\u957f\u65f6\u95f4\u8fde\u63a5\u6765\u8bf4\u662f\u597d\u7684\uff0c\u4f46\u5bf9\u4e8e\u9700\u8981\u4f4e\u5ef6\u8fdf\u7684\u77ed\u6682\u8fde\u63a5\u6765\u8bf4\u662f\u4e0d\u597d\u7684\uff0c\u4e3b\u8981\u662f\u8fd9\u4e9b\u91cd\u4f20\u90fd\u4f1a\u7ecf\u8fc7RTO(Retransmission timeouts)\uff0c\u8fd9\u4e2a\u65f6\u95f4\u7684\u957f\u77ed\u4f1a\u4ea7\u751f\u4e00\u4e9b\u8d1f\u9762\u7684\u5f71\u54cd\uff0c\u56e0\u6b64\u4e5f\u4e0d\u662f\u4e00\u4e2a\u4e07\u7528\u7684\u89e3\u6cd5\u3002<\/p>\n\n\n\n

ECN(Explicit CongestionNotification)\u7684\u51fa\u73b0\u5bf9\u62e5\u585e\u72b6\u51b5\u63d0\u4f9b\u4e86\u4e0d\u5c11\u6539\u8fdb\uff0c\u5982DCTCP(data center TCP)\u5c31\u91c7\u7528\u4e86\u8be5\u6280\u672f\u6765\u8f85\u52a9\u3002\u8be5\u6280\u672f\u5bf9\u4e8e\u957f\u65f6\u95f4\u7684\u6d41\u91cf\u6765\u8bf4\uff0c\u80fd\u591f\u6709\u6548\u7684\u51cf\u5c11\u62a5\u6587\u4e22\u5f03\u7684\u6570\u91cf\uff0c\u7136\u800c\u5bf9\u77ed\u6682\u6d41\u91cf\u6765\u8bf4\u5374\u6ca1\u6709\u592a\u5927\u7684\u5e2e\u52a9\uff0c\u56e0\u4e3a\u77ed\u6682\u6d41\u91cf\u592a\u77ed\u6682\u4e86\uff0c\u6839\u672c\u6765\u4e0d\u53ca\u53bb\u63a5\u6536ECN\u62a5\u6587\u5e76\u5904\u7406\u3002\u5728\u73b0\u5b9e\u60c5\u51b5\u4e2d\uff0c\u4ea4\u6362\u673a\u672c\u8eab\u4f1a\u91c7\u7528\u8f83\u5927\u7684\u7f13\u5b58\u6765\u5904\u7406\u62a5\u6587\u4ee5\u53caECN\u62a5\u6587\uff0c\u8fd9\u79cd\u8bbe\u8ba1\u5bf9\u4e8eIncast\u7684\u73b0\u8c61\u80fd\u591f\u6709\u6548\u5730\u51cf\u7f13\u62a5\u6587\u88ab\u4e22\u5f03\u7684\u60c5\u5f62\u3002\u4f46\u4e5f\u56e0\u4e3a\u7f13\u5b58\u592a\u5927\uff0c\u6bcf\u4e2a\u62a5\u6587\u5728\u4ea4\u6362\u673a\u5185\u5f85\u7684\u65f6\u95f4\u5c31\u4f1a\u66f4\u957f\uff0c\u56e0\u6b64\u91cd\u4f20\u673a\u5236\u7684\u65f6\u95f4\u5c31\u4f1a\u88ab\u62c9\u957f\uff0c\u5bfc\u81f4\u5ef6\u8fdf\u8fc7\u5927\u3002
\u9664\u6b64\u4e4b\u5916\uff0c\u5bf9\u4e8e\u65e0\u635f\u4ee5\u592a\u7f51\u4f20\u8f93\u6765\u8bf4\uff0c\u5219\u662f\u4f1a\u901a\u8fc7802.3X\u7684PauseFrame\u6216\u662f802.1 Qbb\u7684PFC (PriorityFlow Control)\u3002\u8fd9\u7c7b\u6280\u672f\u90fd\u662f\u901a\u8fc7\u63a7\u5236\u62a5\u6587\u963b\u6b62\u8f6c\u53d1\u7aef\u505c\u9001\u62a5\u6587\uff0c\u964d\u4f4e\u62a5\u6587\u4e22\u5f03\u7684\u6570\u91cf\u3002\u4f46\u8be5\u6280\u672f\u4e5f\u4e0d\u662f\u5341\u5168\u5341\u7f8e\u7684\uff0c\u4ee5PFC\u6765\u8bf4\uff0c\u5728\u4e00\u4e2a\u9ad8\u8d1f\u8377\u7684\u7f51\u7edc\u4e2d\uff0c\u6709\u53ef\u80fd\u4f1a\u6709\u4e24\u6761\u4e0d\u540c\u7684\u8fde\u63a5\u6839\u636eHash\u5bfc\u5411\u8d70\u5411\u76f8\u540c\uff0c\u540c\u65f6\u8fd9\u4e24\u4e2a\u8fde\u63a5\u6700\u521d\u7684\u8bbe\u5b9a\u662f\u76f8\u540c\u7684\u4f18\u5148\u5ea6\uff0c\u5219\u6709\u53ef\u80fd\u4f1a\u56e0\u4e3a\u4e00\u6761\u8fde\u63a5\u7684\u62e5\u585e\u8fdb\u800c\u5bfc\u81f4\u5176\u4ed6\u8fde\u63a5\u4e5f\u88ab\u5f71\u54cd\u5230\u3002
\u4e0a\u8ff0\u8fd9\u4e9b\u62e5\u585e\u5236\u7684\u8bbe\u8ba1\u9664ECN\u4e4b\u5916\uff0c\u5176\u4f59\u7684\u5bf9\u4e8ePer-packet ECMP\u90fd\u6ca1\u6709\u80fd\u591f\u63d0\u4f9b\u826f\u597d\u7684\u6548\u679c\u3002
\u8bba\u6587\u6700\u540e\uff0c\u63d0\u5230\u4e86\u4e00\u79cd\u79f0\u4e3aCP(Cut Payload)\u7684\u505a\u6cd5\uff0c\u8fd9\u79cd\u673a\u5236\u5c31\u662f\u5f53\u62e5\u585e\u53d1\u751f\u65f6\uff0c\u4e0d\u4e22\u5f03\u6574\u4e2a\u62a5\u6587\uff0c\u800c\u53ea\u662f\u4e22\u5f03\u62a5\u6587\u7684\u6570\u636e\uff0c\u800c\u4fdd\u7559\u62a5\u6587\u7684\u5305\u5934\u3002\u5f53\u5e94\u7528\u7a0b\u5e8f\u7aef\u6536\u5230\u53ea\u6709\u5305\u5934\uff0c\u6ca1\u6709\u6570\u636e\u7684\u62a5\u6587\uff0c\u5c31\u53ef\u4ee5\u77e5\u9053\u8fd9\u4e2a\u5f53\u524d\u7ebf\u8def\u6709\u62e5\u585e\u95ee\u9898\uff0c\u53ef\u4ee5\u8fdb\u884c\u76f8\u5e94\u7684\u5904\u7406\u3002
\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5c31\u53ef\u4ee5\u907f\u514d\u51cf\u5c11RTO\u5bf9\u4e8e\u91cd\u4f20\u9020\u6210\u7684\u65f6\u95f4\u5ef6\u8fdf\u3002\u7136\u800c\u8fd9\u79cd\u8bbe\u8ba1\u4e5f\u6709\u4e24\u4e2a\u95ee\u9898(\u6bd5\u7adfCP\u662f1994\u63d0\u51fa\u7684\u8bba\u6587)<\/p>\n\n\n\n

1\uff0e\u4ea4\u6362\u673a\u91c7\u7528FIFO\u673a\u5236\uff0c\u6240\u4ee5\u8fd9\u4e9b\u88ab\u4e22\u6389\u6570\u636e\u7684\u62a5\u6587\uff0c\u4e5f\u662f\u8981\u6162\u6162\u7b49\u5f85\u4ea4\u6362\u673a\u5c06\u62a5\u6587\u5904\u7406\u5b8c\u6bd5\u624d\u53ef\u4ee5\u5f80\u5916\u8f6c\u9001\uff0c\u8fd9\u5c31\u4f1a\u5927\u5e45\u589e\u52a0\u8fd9\u4e9b\u62a5\u6587\u7684RTT\u65f6\u95f4\u3002<\/p>\n\n\n\n

2.\u8be5\u8bbe\u8ba1\u662f\u57fa\u4e8esingle-path\u4f20\u8f93\uff0c\u6ca1\u6709\u8003\u8651\u5230\u591a\u6761\u8def\u5f84\u4f20\u8f93\uff0c\u4e0d\u8bba\u662fper-packet\u6216\u662fper-flow\u7684ECMP\u3002<\/p>\n\n\n\n

\u81f3\u6b64\uff0c\u53ef\u4ee5\u5f52\u7eb3\u51fa\u4f5c\u8005\u5fc3\u76ee\u4e2d\u7684\u5b8c\u7f8e\u534f\u8bae\u4e86\uff0c\u7b80\u5355\u56de\u987e\u4e00\u4e0b\uff1a<\/p>\n\n\n\n

1.\u5bf9\u4e8e\u77ed\u6682\u6d41\u91cf\u80fd\u591f\u63d0\u4f9b\u4f4e\u5ef6\u8fdf\uff0c\u4f4e\u5ef6\u8fdf\uff0c\u4f4e\u5ef6\u8fdf<\/p>\n\n\n\n

2.\u5bf9\u4e8e\u957f\u65f6\u95f4\u6d41\u91cf\u5c3d\u91cf\u80fd\u591f\u63d0\u4f9b\u9ad8\u6d41\u91cf\u8f93\u51fa<\/p>\n\n\n\n

3.per-packetECMP<\/p>\n\n\n\n

4.\u9047\u5230Incast\u7b49\u60c5\u51b5\u4e5f\u80fd\u591f\u7ee7\u7eed\u4fdd\u6301\u4f4e\u5ef6\u8fdf<\/p>\n\n\n\n

\u540e\u6587\u4f1a\u8ba8\u8bbaNDP\u5230\u5e95\u5982\u4f55\u5904\u7406\u624d\u80fd\u5c3d\u53ef\u80fd\u5730\u6709\u63d0\u4f9b\u4e0a\u8ff0\u529f\u80fd\u3002<\/p>\n\n\n\n

\u8bbe\u8ba1<\/p>\n\n\n\n

\u4e3a\u4e86\u6ee1\u8db3\u4e0a\u8ff0\u7684\u6761\u4ef6\uff0cNDP\u5728\u8bbe\u8ba1\u65f6\u5c31\u51b3\u5b9a\u6574\u4e2a\u8bbe\u8ba1\u8981\u5305\u542b\u5b8c\u6574\u7684\u67b6\u6784\uff0c\u8fd9\u5305\u542b\u4e86\uff1a
1.\u4ea4\u6362\u673a\u7684\u884c\u4e3a
2.\u8def\u7531
3.\u5168\u65b0\u7684\u4f20\u8f93\u534f\u8bae<\/p>\n\n\n\n

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\"5c5456b176686e3b770cf39b648c15b9\"<\/figure>\n\n\n\n

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