{"id":115083,"date":"2026-10-11T04:49:00","date_gmt":"2026-10-10T20:49:00","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/115083.html"},"modified":"2026-10-11T04:49:00","modified_gmt":"2026-10-10T20:49:00","slug":"roce-v2-%e8%b7%a8%e7%bd%91%e6%ae%b5%e9%80%9a%e4%bf%a1%e9%99%8d%e7%ba%a7%e9%98%b2%e7%ba%bf%ef%bc%9a%e6%b7%b7%e5%90%88%e4%ba%91%e5%9c%ba%e6%99%af%e4%b8%8b%e7%9a%84%e6%9c%89%e6%8d%9f%e5%9b%9e%e9%80%80","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/115083.html","title":{"rendered":"RoCE v2 \u8de8\u7f51\u6bb5\u901a\u4fe1\u964d\u7ea7\u9632\u7ebf\uff1a\u6df7\u5408\u4e91\u573a\u666f\u4e0b\u7684\u6709\u635f\u56de\u9000\u4e0e DSCP \u6620\u5c04\u4fee\u590d"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/10\/20261010204855-6acaa4b7b4c9b.png\" alt=\"\u5c01\u9762\u4fe1\u606f\u56fe\" \/><\/p>\n<p>\u5728\u7edd\u5927\u591a\u6570 AI \u667a\u7b97\u7f51\u7edc\u767d\u76ae\u4e66\u4e2d&#xff0c;\u5173\u4e8e RoCE v2&#xff08;\u4ee5\u592a\u7f51 RDMA&#xff09;\u7684\u67b6\u6784\u8bbe\u8ba1\u90fd\u5efa\u7acb\u5728\u4e00\u4e2a\u6781\u5176\u4e25\u82db\u7684\u7269\u7406\u5047\u8bbe\u4e4b\u4e0a&#xff1a;\u6240\u6709 GPU \u670d\u52a1\u5668\u5fc5\u987b\u88ab\u5708\u5b9a\u5728\u540c\u4e00\u4e2a\u6570\u636e\u4e2d\u5fc3\u673a\u623f\u5185\u90e8\u3001\u540c\u4e00\u4e2a\u4e25\u683c\u53d7\u63a7\u7684\u4e09\u5c42 Spine-Leaf \u7f51\u7edc\u65e0\u635f\u57df\u4e2d\u3002\u5168\u7f51\u6240\u6709\u4ea4\u6362\u673a\u5fc5\u987b\u6574\u9f50\u5212\u4e00\u5730\u5f00\u542f PFC&#xff08;\u57fa\u4e8e\u4f18\u5148\u7ea7\u7684\u6d41\u63a7&#xff09;\u4e0e ECN&#xff0c;\u675c\u7edd\u4efb\u4f55\u4e00\u4e2a\u6570\u636e\u5305\u7684\u4e22\u5931\u3002<\/p>\n<p>\u7136\u800c&#xff0c;\u5f53\u4f01\u4e1a\u7684\u7b97\u529b\u89c4\u6a21\u8de8\u5165\u53cc 11 \u6df7\u5408\u4e91&#xff08;Hybrid Cloud&#xff09;\u4e0e\u591a\u53ef\u7528\u533a&#xff08;Multi-AZ&#xff09;\u65f6\u4ee3&#xff0c;\u8fd9\u4e00\u7406\u60f3\u5047\u8bbe\u88ab\u73b0\u5b9e\u5f7b\u5e95\u7c89\u788e\u4e86&#xff1a;\u4e3a\u4e86\u5e94\u5bf9\u53cc 11 \u72c2\u66b4\u7684\u5cf0\u503c\u7b97\u529b&#xff0c;\u4f01\u4e1a\u4e0d\u4ec5\u4f7f\u7528\u81ea\u6709\u667a\u7b97\u4e2d\u5fc3\u7684\u7269\u7406\u673a\u623f&#xff0c;\u8fd8\u5fc5\u987b\u5728\u516c\u6709\u4e91\u4e0a\u4e34\u65f6\u6309\u9700\u79df\u8d41\u6570\u5343\u5f20\u9ad8\u7aef GPU\u3002\u5f53\u5206\u5e03\u5f0f\u5fae\u8c03\u7684\u68af\u5ea6\u540c\u6b65\u6216\u8005\u8de8\u53ef\u7528\u533a\u7684\u5927\u6a21\u578b\u63a8\u7406\u6d41\u6c34\u7ebf\u5fc5\u987b\u8de8\u8d8a\u673a\u623f\u8fb9\u754c\u3001\u6d41\u7ecf\u57ce\u57df\u7f51\u5149\u7f06\u6216\u8005\u516c\u6709\u4e91\u865a\u62df\u79c1\u6709\u4e91&#xff08;VPC&#xff09;\u5e95\u5c42\u65f6&#xff0c;\u7cfb\u7edf\u4f1a\u77ac\u95f4\u906d\u9047\u6bc1\u706d\u6027\u7684\u7f51\u7edc\u65ad\u5d16&#xff1a;<\/p>\n<p>\u516c\u6709\u4e91\u5382\u5546\u6216\u8005\u7b2c\u4e09\u65b9\u9aa8\u5e72\u7f51\u8fd0\u8425\u5546&#xff0c;\u575a\u51b3\u5728\u8de8\u8fb9\u754c\u8def\u7531\u8bbe\u5907\u4e0a\u5b8c\u5168\u5173\u95ed\u4e86 PFC PAUSE \u5e27\u7684\u900f\u4f20&#xff08;\u56e0\u4e3a\u5728\u8de8\u79df\u6237\u6216\u5e7f\u57df\u7f51\u4e0a\u5f00\u542f PFC \u6781\u6613\u5f15\u53d1\u8de8\u5730\u57df\u7684\u5168\u7f51\u7ea7\u6b7b\u9501\u4e0e\u5e7f\u64ad\u98ce\u66b4&#xff09;&#xff1b;\u4e0d\u4ec5\u5982\u6b64&#xff0c;\u4e2d\u95f4\u7684\u865a\u62df\u5316\u7f51\u5173\u9ed8\u8ba4\u8fd8\u4f1a\u7c97\u66b4\u5730\u5c06 IP \u62a5\u6587\u5934\u90e8\u7684 DSCP\/TOS \u4f18\u5148\u7ea7\u5b57\u6bb5\u76f4\u63a5\u6e05\u96f6\u3002\u7ed3\u679c\u5c31\u662f&#xff0c;\u539f\u672c\u5728\u673a\u623f\u5185\u90e8\u8dd1\u5f97\u6781\u901f\u98de\u8d77\u7684 RoCE v2 \u6d41\u91cf&#xff0c;\u4e00\u65e6\u8de8\u51fa\u673a\u623f\u8fb9\u754c&#xff0c;\u5c31\u4f1a\u56e0\u4e3a 0.01% \u7684\u6b63\u5e38\u7f51\u7edc\u4e22\u5305\u800c\u9677\u5165\u6b7b\u5faa\u73af\u822c\u7684 Go-Back-N \u786c\u4ef6\u91cd\u4f20\u98ce\u66b4&#xff0c;NCCL \u9891\u7e41\u62a5\u51fa\u81f4\u547d\u7684 IBV_WC_RETRY_EXC_ERR&#xff0c;\u5bfc\u81f4\u6574\u4e2a\u6df7\u5408\u4e91\u7b97\u529b\u5e95\u5ea7\u5168\u9762\u762b\u75ea\u3002<\/p>\n<p>\u8981\u8ba9\u7b97\u529b\u51b2\u7834\u5355\u4e00\u7269\u7406\u673a\u623f\u7684\u56f4\u5899&#xff0c;\u5fc5\u987b\u5efa\u7acb\u57fa\u4e8e\u6709\u635f\u7f51\u7edc\u81ea\u9002\u5e94\u56de\u9000&#xff08;Lossy RoCE v2&#xff09;\u4e0e\u786c\u4ef6\u7ea7 DSCP \u96a7\u9053\u4fee\u590d\u7684\u8de8\u7f51\u6bb5\u964d\u7ea7\u9632\u7ebf\u3002<\/p>\n<p>\u673a\u623f\u5185\u90e8\u65e0\u635f RoCE vs \u6df7\u5408\u4e91\u8de8\u8fb9\u754c\u6709\u635f\u964d\u7ea7<br \/>\nIDC \u5185\u90e8\u53d7\u63a7\u5c40\u57df\u7f51 (\u7eaf\u65e0\u635f\u73af\u5883)<br \/>\nGPU \u8282\u70b9 A \u2500\u2500\u25ba [\u4ea4\u6362\u673a 100% \u652f\u6301 PFC \/ ECN \u786c\u4ef6\u6d41\u63a7] \u2500\u2500\u25ba GPU \u8282\u70b9 B (\u96f6\u4e22\u5305\u8fd0\u884c)<\/p>\n<p>\u6df7\u5408\u4e91\u8de8\u7f51\u6bb5\u4f20\u8f93 (\u8fb9\u754c\u51fb\u7a7f\u4e0e\u964d\u7ea7\u81ea\u6108)<br \/>\nIDC \u79c1\u6709\u7b97\u529b\u8282\u70b9 \u2500\u2500\u25ba \u8de8\u8d8a\u57ce\u57df\u7f51 \/ \u516c\u6709\u4e91 VPC (PFC \u5e27\u88ab\u4e2d\u95f4\u8def\u7531\u76f4\u63a5\u4e22\u5f03&#xff01;DSCP \u88ab\u8e29\u5e73&#xff01;)<br \/>\n                     \u2502<br \/>\n                     \u25bc \u542f\u52a8\u81ea\u9002\u5e94\u964d\u7ea7\u9632\u7ebf<br \/>\n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510<br \/>\n\u2502 1. \u786c\u4ef6\u7ea7 DSCP \u5c01\u88c5\u4fdd\u62a4 (\u901a\u8fc7 Geneve\/VXLAN \u5c01\u5305\u7a7f\u900f)    \u2502<br \/>\n\u2502 2. \u6fc0\u6d3b\u7f51\u5361\u7ea7\u5feb\u901f\u9009\u62e9\u6027\u91cd\u4f20 (Selective Repeat \u66ff\u4ee3 GBN)\u2502<br \/>\n\u2502 3. \u542f\u7528 BBR-based \u8de8\u5730\u57df\u4f4e\u5ef6\u8fdf\u62e5\u585e\u63a7\u5236\u7b97\u6cd5             \u2502<br \/>\n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<br \/>\n                     \u2502<br \/>\n                     \u25bc \u5373\u4f7f\u5b58\u5728 0.1% \u6b63\u5e38\u7269\u7406\u6296\u52a8<br \/>\n\u516c\u6709\u4e91 GPU \u5f39\u6027\u8282\u70b9\u7a33\u5b9a\u63a5\u6d41&#xff0c;NCCL \u901a\u4fe1\u5e26\u5bbd\u7a33\u5065\u8dd1\u6ee1 85% \u7ebf\u901f&#xff01;<\/p>\n<h3>1. \u89c2\u5ff5\u98a0\u8986&#xff1a;RoCE v2 \u79bb\u5f00 PFC \u771f\u7684\u4e0d\u80fd\u6d3b\u5417&#xff1f;<\/h3>\n<p>\u5728\u5f88\u591a\u7f51\u7edc\u5de5\u7a0b\u5e08\u7684\u4f20\u7edf\u89c2\u5ff5\u91cc&#xff0c;\u6709\u4e00\u79cd\u6839\u6df1\u8482\u56fa\u7684\u8bef\u89e3&#xff1a;\u201cRoCE v2 \u5fc5\u987b\u4f9d\u8d56 PFC&#xff0c;\u4e22\u4e00\u4e2a\u5305\u5c31\u4f1a\u6b7b\u6389&#xff0c;\u6240\u4ee5\u5b83\u7edd\u5bf9\u4e0d\u80fd\u8de8\u7f51\u6bb5\u5728\u6709\u635f\u7f51\u7edc\u4e0a\u8dd1\u3002\u201d<\/p>\n<p>\u8fd9\u4e00\u89c2\u5ff5\u5728\u65e9\u671f\u786c\u4ef6\u4e0a\u786e\u5b9e\u662f\u4e8b\u5b9e&#xff1b;\u4f46\u968f\u7740\u73b0\u4ee3\u9ad8\u6027\u80fd\u667a\u80fd\u7f51\u5361&#xff08;\u5982 NVIDIA ConnectX-6\/7\/8\u3001BlueField DPU&#xff09;\u7684\u6f14\u8fdb&#xff0c;\u7eaf\u6709\u635f RoCE v2&#xff08;Lossy RoCE&#xff09;\u4e0d\u4ec5\u5b8c\u5168\u53ef\u884c&#xff0c;\u800c\u4e14\u662f\u8de8\u673a\u623f\u5927\u7b97\u529b\u534f\u540c\u7684\u552f\u4e00\u89e3\u6cd5\u3002<\/p>\n<p>\u73b0\u4ee3\u7f51\u5361\u5728\u786c\u4ef6\u5e95\u5c42\u8865\u9f50\u4e86\u4e24\u9879\u98a0\u8986\u6027\u6b66\u5668&#xff1a;<\/p>\n<li>\u786c\u4ef6\u7ea7\u9009\u62e9\u6027\u91cd\u4f20&#xff08;Selective Repeat, SR&#xff09;&#xff1a;\u5f7b\u5e95\u6dd8\u6c70\u4e86\u91ce\u86ee\u843d\u540e\u7684\u201c\u9000\u540e N \u5e27&#xff08;Go-Back-N&#xff09;\u201d\u91cd\u4f20\u673a\u5236\u3002\u5f53\u53d1\u751f\u8de8\u7f51\u6bb5\u4e22\u5305\u65f6&#xff0c;\u63a5\u6536\u7aef\u7f51\u5361\u53ea\u8981\u6c42\u53d1\u9001\u7aef\u91cd\u53d1\u90a3\u4e00\u4e2a\u771f\u6b63\u4e22\u5931\u7684\u7279\u5b9a\u5e8f\u53f7\u62a5\u6587&#xff0c;\u540e\u7eed\u5230\u8fbe\u7684\u62a5\u6587\u7167\u5e38\u88ab\u7f51\u5361\u786c\u4ef6\u4fdd\u5b58\u5728\u91cd\u7ec4\u7f13\u51b2\u533a\u4e2d\u3002\u4e22\u5305\u5e26\u6765\u7684\u901a\u4fe1\u5f00\u9500\u4ece\u6570\u5341\u5146\u5de8\u5e45\u538b\u7f29\u4e3a\u5355\u4e2a\u62a5\u6587&#xff1b;<\/li>\n<li>\u57fa\u4e8e RTT \u5f80\u8fd4\u65f6\u5ef6\u7684\u7aef\u5230\u7aef\u62e5\u585e\u63a7\u5236\u7b97\u6cd5&#xff08;\u5982 TIMELY\u3001BBR-RDMA&#xff09;&#xff1a;\u6446\u8131\u4e86\u5bf9\u4e2d\u95f4\u4ea4\u6362\u673a\u6253 ECN \u6807\u8bb0\u7684\u5f3a\u4f9d\u8d56\u3002\u7f51\u5361\u82af\u7247\u5728\u7eb3\u79d2\u7ea7\u76f4\u63a5\u6d4b\u91cf\u7aef\u5230\u7aef\u786c\u4ef6 ACK \u7684\u5f80\u8fd4\u65f6\u5ef6&#xff08;RTT&#xff09;\u3002\u53ea\u8981\u53d1\u73b0\u65f6\u5ef6\u51fa\u73b0\u5fae\u5f31\u4e0a\u7fd8&#xff0c;\u53d1\u9001\u7aef\u7f51\u5361\u81ea\u4e3b\u4ee5\u5fae\u79ef\u5206\u6b65\u957f\u964d\u4f4e\u53d1\u5305\u901f\u7387&#xff0c;\u5728\u4e2d\u95f4\u7f51\u7edc\u53d1\u751f\u7269\u7406\u4e22\u5305\u4e4b\u524d\u5b8c\u6210\u6beb\u79d2\u7ea7\u907f\u78b0\u3002<\/li>\n<p>\u8fd9\u610f\u5473\u7740&#xff0c;\u5373\u4f7f\u5728\u5b8c\u5168\u6ca1\u6709 PFC \u4fdd\u62a4\u7684\u666e\u901a\u4ee5\u592a\u7f51\u751a\u81f3\u516c\u6709\u4e91\u7f51\u7edc\u4e0a&#xff0c;RoCE v2 \u4f9d\u7136\u80fd\u591f\u4fdd\u6301\u6781\u9ad8\u541e\u5410\u3002<\/p>\n<h3>2. \u6838\u5fc3\u6218\u5f79&#xff1a;DSCP \u4f18\u5148\u7ea7\u8de8\u8fb9\u754c\u96a7\u9053\u4fee\u590d<\/h3>\n<p>\u8de8\u7f51\u6bb5\u901a\u4fe1\u9762\u4e34\u7684\u6700\u51f6\u9669\u9677\u9631&#xff0c;\u662f\u4e2d\u95f4\u8bbe\u5907\u5bf9 QOS \u4f18\u5148\u7ea7\u7684\u65e0\u60c5\u62b9\u6740\u3002<\/p>\n<p>RoCE v2 \u62a5\u6587\u4f9d\u8d56 IP \u62a5\u6587\u5934\u90e8\u7684 DSCP&#xff08;\u533a\u5206\u670d\u52a1\u4ee3\u7801\u70b9&#xff0c;\u901a\u5e38\u4e3a DSCP 26 \u6216 46&#xff09;\u6765\u8ba9\u7f51\u5361\u8bc6\u522b\u5176\u8fdb\u5165\u4e13\u7528\u7684\u65e0\u635f\u6216\u9ad8\u4f18\u5148\u786c\u4ef6\u961f\u5217\u3002\u7136\u800c&#xff0c;\u5f53\u62a5\u6587\u8de8\u8d8a\u516c\u6709\u4e91 VPC \u7f51\u5173\u6216\u4f01\u4e1a\u7ea7\u8f6f\u4ef6\u5b9a\u4e49\u7f51\u7edc&#xff08;SDN&#xff09;\u65f6&#xff0c;\u4e2d\u95f4\u7f51\u5173\u5f80\u5f80\u4f1a\u5c06\u5916\u90e8\u62a5\u6587\u4e00\u5f8b\u91cd\u5199\u4e3a DSCP 0 (Best Effort)\u3002<\/p>\n<p>\u4e00\u65e6\u8fdb\u5165 Best Effort \u961f\u5217&#xff0c;RoCE \u62a5\u6587\u5728\u7f51\u5361\u5e95\u5c42\u4f1a\u4ece\u9ad8\u4f18\u5148\u7ea7\u786c\u4ef6\u901a\u9053\u8dcc\u843d\u81f3\u4e0e\u666e\u901a\u540e\u53f0\u5907\u4efd\u3001\u65e5\u5fd7\u4e0b\u8f7d\u540c\u6d41\u5408\u6c61\u7684\u5783\u573e\u961f\u5217&#xff0c;\u5bfc\u81f4\u5fae\u79d2\u7ea7\u901a\u4fe1\u5f7b\u5e95\u9000\u5316\u4e3a\u4e0d\u53ef\u9884\u6d4b\u7684\u6beb\u79d2\u7ea7\u963b\u585e\u3002<\/p>\n<h4>\u751f\u4ea7\u89e3\u6cd5&#xff1a;\u57fa\u4e8e Geneve \/ VXLAN \u96a7\u9053\u7684\u4f18\u5148\u7ea7\u900f\u4f20<\/h4>\n<p>\u6211\u4eec\u901a\u8fc7\u5728\u8fb9\u754c\u7f51\u5173\u4e0e\u5bb9\u5668\u5bbf\u4e3b\u673a\u5c42&#xff0c;\u4f7f\u7528 eBPF \u4e0e Open vSwitch&#xff08;OVS&#xff09;\u6784\u5efa\u4e86\u4e00\u5957\u5916\u5c42 DSCP \u7ee7\u627f&#xff08;DSCP Inheritance&#xff09;\u6d41\u6c34\u7ebf&#xff1a;<\/p>\n<p># 1. \u5728\u5bbf\u4e3b\u673a\u5c42\u9762\u914d\u7f6e\u6d41\u91cf\u63a7\u5236\u5668 (tc)&#xff0c;\u786e\u4fdd\u672c\u5730\u53d1\u51fa\u7684 RoCE \u6d41\u91cf\u5f3a\u5236\u6253\u4e0a DSCP 46 (EF \u6781\u901f\u8f6c\u53d1\u7c7b)<br \/>\ntc qdisc add dev eth0 root handle 1: prio<br \/>\ntc filter add dev eth0 parent 1: protocol ip prio 1 u32 \\\\<br \/>\n  match ip dport 4791 0xffff \\\\<br \/>\n  action skbedit mark 0x100<br \/>\ntc filter add dev eth0 parent 1: handle 0x100 fw \\\\<br \/>\n  action pedit munge ip tos set 0xb8 # \u8bbe\u7f6e DSCP 46 (0xb8 &#061; 46 &lt;&lt; 2)<\/p>\n<p># 2. \u5728\u8de8\u5730\u57df Overlay \u96a7\u9053\u914d\u7f6e\u4e2d&#xff0c;\u5f3a\u5236\u5f00\u542f Outer Header \u7ee7\u627f Inner Header \u7684 DSCP \u5c5e\u6027<br \/>\nip link add dev geneve-roce type geneve \\\\<br \/>\n  id 100 \\\\<br \/>\n  remote 10.250.0.1 \\\\<br \/>\n  tos inherit # \u5173\u952e\u6307\u4ee4&#xff1a;\u5916\u5c42 UDP \u62a5\u6587\u5934\u5b8c\u7f8e\u7ee7\u627f\u5185\u5c42 RoCE \u62a5\u6587\u7684 DSCP \u4f18\u5148\u7ea7&#xff01;<\/p>\n<p>\u901a\u8fc7\u6307\u5b9a tos inherit&#xff0c;\u5916\u90e8\u4e2d\u95f4\u516c\u6709\u4e91\u7f51\u7edc\u770b\u5230\u7684\u53ea\u662f\u4e00\u4e2a\u666e\u901a\u5e26\u6709\u9ad8\u4f18\u5148\u7ea7\u6807\u8bb0\u7684 UDP \u62a5\u6587&#xff0c;\u4ece\u800c\u7ed9\u4e88\u6700\u9ad8\u4f18\u5148\u7ea7\u7684\u4ea4\u6362\u8f6c\u53d1&#xff0c;\u5e76\u5728\u5230\u8fbe\u5bf9\u7aef\u89e3\u5c01\u88c5\u540e\u6beb\u53d1\u65e0\u635f\u5730\u8fd8\u539f\u7ed9 GPU \u7f51\u5361\u5904\u7406\u3002<\/p>\n<h3>3. \u5bbf\u4e3b\u673a\u7f51\u5361\u9a71\u52a8\u53c2\u6570\u81ea\u9002\u5e94\u964d\u7ea7\u914d\u7f6e<\/h3>\n<p>\u4e3a\u4e86\u5728\u6df7\u5408\u4e91\u8de8\u7f51\u6bb5\u73af\u5883\u4e0b\u6fc0\u6d3b\u7eaf\u6709\u635f\u5feb\u901f\u91cd\u4f20\u7279\u6027&#xff0c;\u5fc5\u987b\u5728\u7b97\u529b\u8282\u70b9\u7684 Linux \u7cfb\u7edf\u4e2d\u5bf9\u7f51\u5361\u5e95\u5c42\u53c2\u6570\u8fdb\u884c\u663e\u5f0f\u58f0\u660e&#xff1a;<\/p>\n<p># 1. \u5f7b\u5e95\u5173\u95ed\u8be5\u7aef\u53e3\u5bf9\u5916\u90e8 PFC PAUSE \u5e27\u7684\u4f9d\u8d56&#xff0c;\u907f\u514d\u5728\u8de8\u5730\u57df\u7f51\u7edc\u4e2d\u76f2\u76ee\u7b49\u5f85\u6682\u505c<br \/>\necho 0 &gt; \/sys\/class\/net\/eth0\/ecn\/roce_np\/prio<\/p>\n<p># 2. \u5f3a\u5236\u8981\u6c42\u7f51\u5361\u5728\u786c\u4ef6\u5e95\u5c42\u542f\u7528 Selective Repeat (\u9009\u62e9\u6027\u91cd\u4f20) \u6a21\u5f0f<br \/>\n# \u5199\u5165\u7279\u5b9a\u786c\u4ef6\u5bc4\u5b58\u5668\u63a9\u7801 (\u4ee5 NVIDIA ConnectX \u9a71\u52a8\u4e3a\u4f8b)<br \/>\nmstflint -d 0000:01:00.0 set_param RO_SELECTIVE_REPEAT_EN&#061;1<\/p>\n<p># 3. \u8c03\u5927\u7f51\u5361\u7aef\u91cd\u4f20\u8d85\u65f6\u5b9a\u65f6\u5668\u7684\u654f\u611f\u5ea6 (\u538b\u81f3\u5fae\u79d2\u7ea7\u81ea\u6108)<br \/>\n# \u5c06 ACK \u8d85\u65f6\u4ece\u9ed8\u8ba4\u4fdd\u5b88\u7684\u6570\u5341\u6beb\u79d2\u8c03\u6574\u4e3a 500 \u5fae\u79d2<br \/>\necho 14 &gt; \/sys\/class\/net\/eth0\/ecn\/roce_rp\/local_ack_timeout<\/p>\n<p>\u901a\u8fc7\u5c06 local_ack_timeout \u538b\u5236\u5728\u5b89\u5168\u533a\u95f4&#xff0c;\u4e00\u65e6\u8de8\u673a\u623f\u5149\u7ea4\u53d1\u751f\u5076\u53d1\u4e22\u5305&#xff0c;\u53d1\u9001\u7aef\u7f51\u5361\u5728 500 \u5fae\u79d2\u5185\u5373\u53ef\u654f\u9510\u53d1\u73b0\u5e76\u5728\u672c\u5730\u89e6\u53d1\u5355\u5305\u91cd\u4f20&#xff0c;\u5f7b\u5e95\u6d88\u9664\u4e86\u8fc7\u53bb\u52a8\u8f84\u5361\u6b7b\u6570\u79d2\u7684\u901a\u4fe1\u505c\u6ede\u3002<\/p>\n<h3>4. \u67b6\u6784\u5e08\u7684\u4e00\u7ebf\u907f\u5751\u94c1\u5f8b<\/h3>\n<p>\u5728\u90e8\u7f72\u8de8\u7f51\u6bb5 RoCE v2 \u7684\u751f\u4ea7\u5b9e\u6218\u4e2d&#xff0c;\u6709\u4e24\u4e2a\u8db3\u4ee5\u5bfc\u81f4\u94fe\u8def\u5f7b\u5e95\u9ed1\u6d1e\u7684\u6df1\u5751\u5fc5\u987b\u8bbe\u6b7b\u9632\u7ebf&#xff1a;<\/p>\n<li>PMTU&#xff08;Path MTU&#xff09;\u9ed1\u6d1e\u5f15\u53d1\u7684\u6b7b\u9501\u5d29\u6e83&#xff1a;\u5728\u673a\u623f\u5c40\u57df\u7f51\u5185\u90e8&#xff0c;\u6211\u4eec\u666e\u904d\u5f00\u542f\u4e86 Jumbo Frame&#xff08;MTU&#061;9000 \u5b57\u8282&#xff09;\u3002\u4f46\u5728\u8de8\u8d8a\u6df7\u5408\u4e91\u8fb9\u754c\u6216\u8005\u7ecf\u7531\u516c\u6709\u4e91 VPC \u65f6&#xff0c;\u7531\u4e8e\u591a\u5c42 Overlay \u96a7\u9053&#xff08;\u5982 Geneve\/VXLAN&#xff09;\u989d\u5916\u589e\u52a0\u4e86 50 \u5230 60 \u5b57\u8282\u7684\u5916\u90e8\u5c01\u88c5\u5934&#xff0c;\u5bfc\u81f4\u94fe\u8def\u7684\u771f\u5b9e\u6700\u5927 MTU \u8dcc\u843d\u81f3 8900 \u751a\u81f3 1500 \u5b57\u8282\u3002\u5982\u679c RDMA \u8fdb\u7a0b\u5f3a\u884c\u4ee5 4096 \u6216 9000 \u5b57\u8282\u7684\u8d85\u5927\u6570\u636e\u5305\u5411\u5916\u53d1\u5c04&#xff0c;\u62a5\u6587\u4f1a\u5728\u4e2d\u95f4\u8fb9\u754c\u88ab\u4ea4\u6362\u673a\u9759\u9ed8\u4e22\u5f03&#xff08;\u56e0\u4e3a RDMA \u4e0d\u652f\u6301 IP \u5c42\u7684\u5206\u7247\u91cd\u7ec4&#xff01;&#xff09;\u3002\u751f\u4ea7\u51c6\u5219\u5fc5\u987b\u5728\u8de8\u7f51\u6bb5\u73af\u5883\u4e2d&#xff0c;\u5c06 NCCL \u4e0e\u7f51\u5361\u7684 RoCE MTU \u4e25\u683c\u9501\u5b9a\u4e3a 1024 \u5b57\u8282\u6216\u5b89\u5168\u57fa\u51c6\u7684 4096 \u5b57\u8282&#xff08;\u5e76\u786e\u4fdd\u5e95\u5c42\u7269\u7406\u94fe\u8def\u914d\u7f6e\u4e86 9216 \u5b57\u8282\u8d85\u5927\u51c0\u7a7a&#xff09;\u3002<\/li>\n<li>\u591a\u79df\u6237\u6df7\u5408\u6d41\u91cf\u7684\u65e0\u635f\u961f\u5217\u6bd2\u5316&#xff1a;\u7edd\u4e0d\u80fd\u8ba9\u8de8\u7f51\u6bb5\u7684\u666e\u901a\u6587\u4ef6\u4e0b\u8f7d\u6d41\u91cf\u548c\u4f4e\u5ef6\u8fdf\u7684 RDMA \u6d41\u91cf\u5171\u7528\u540c\u4e00\u4e2a\u4f18\u5148\u7ea7\u3002\u5fc5\u987b\u5728\u8fb9\u754c\u9632\u706b\u5899\u5904\u5efa\u7acb\u4e25\u683c\u7684\u4e94\u5143\u7ec4\u767d\u540d\u5355&#xff0c;\u4ec5\u653e\u884c\u88ab\u8ba4\u8bc1\u7684\u667a\u7b97\u8282\u70b9\u8de8\u533a IP \u901a\u4fe1&#xff0c;\u9632\u6b62\u5916\u90e8\u672a\u77e5\u6d41\u91cf\u6c61\u67d3\u5185\u90e8\u7684\u9ad8\u901f\u786c\u4ef6\u961f\u5217\u3002<\/li>\n<p>\u57fa\u7840\u8bbe\u65bd\u7684\u5f3a\u5927&#xff0c;\u4e0d\u4ec5\u4f53\u73b0\u5728\u5b83\u5728\u7406\u60f3\u6e29\u5ba4\u91cc\u80fd\u591f\u8dd1\u5f97\u591a\u5feb&#xff0c;\u66f4\u4f53\u73b0\u5728\u5b83\u5728\u9762\u5bf9\u7834\u788e\u590d\u6742\u7684\u771f\u5b9e\u7f51\u7edc\u65f6\u80fd\u591f\u5c55\u73b0\u51fa\u591a\u5f3a\u7684\u751f\u5b58\u97e7\u6027\u3002\u901a\u8fc7\u7834\u9664 PFC \u7684\u5355\u4e00\u795e\u8bdd&#xff0c;\u6253\u901a\u6709\u635f\u81ea\u9002\u5e94\u964d\u7ea7\u4e0e DSCP \u7a7f\u900f\u4fee\u590d&#xff0c;\u6211\u4eec\u5f7b\u5e95\u6495\u7834\u4e86\u5730\u57df\u4e0e\u673a\u623f\u5bf9 AI \u7b97\u529b\u7684\u7269\u7406\u5c01\u9501&#xff0c;\u8ba9\u6df7\u5408\u4e91\u6d77\u91cf\u5f02\u6784 GPU \u8d44\u6e90\u5728\u5927\u4fc3\u524d\u591c\u771f\u6b63\u51dd\u805a\u6210\u4e86\u4e00\u4e2a\u65e0\u7f1d\u534f\u540c\u7684\u7b97\u529b\u5171\u540c\u4f53\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728\u7edd\u5927\u591a\u6570 AI \u667a\u7b97\u7f51\u7edc\u767d\u76ae\u4e66\u4e2d&#xff0c;\u5173\u4e8e RoCE v2&#xff08;\u4ee5\u592a\u7f51 RDMA&#xff09;\u7684\u67b6\u6784\u8bbe\u8ba1\u90fd\u5efa\u7acb\u5728\u4e00\u4e2a\u6781\u5176\u4e25\u82db\u7684\u7269\u7406\u5047\u8bbe\u4e4b\u4e0a&#xff1a;\u6240\u6709 GPU \u670d\u52a1\u5668\u5fc5\u987b\u88ab\u5708\u5b9a\u5728\u540c\u4e00\u4e2a\u6570\u636e\u4e2d\u5fc3\u673a\u623f\u5185\u90e8\u3001\u540c\u4e00\u4e2a\u4e25\u683c\u53d7\u63a7\u7684\u4e09\u5c42 Spine-Leaf \u7f51\u7edc\u65e0\u635f\u57df\u4e2d\u3002\u5168\u7f51\u6240\u6709\u4ea4\u6362\u673a\u5fc5\u987b\u6574\u9f50\u5212\u4e00\u5730\u5f00\u542f PFC&#xff08;\u57fa\u4e8e\u4f18\u5148\u7ea7\u7684\u6d41\u63a7&#xff09;\u4e0e ECN&#xff0c;\u675c\u7edd\u4efb\u4f55\u4e00\u4e2a\u6570\u636e\u5305\u7684\u4e22\u5931\u3002<br \/>\n\u7136\u800c&#xff0c;\u5f53\u4f01\u4e1a\u7684\u7b97\u529b\u89c4\u6a21\u8de8\u5165\u53cc 1<\/p>\n","protected":false},"author":2,"featured_media":115082,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[66,50,292,100,51],"topic":[],"class_list":["post-115083","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-ai","tag-50","tag-292","tag-100","tag-51"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>RoCE v2 \u8de8\u7f51\u6bb5\u901a\u4fe1\u964d\u7ea7\u9632\u7ebf\uff1a\u6df7\u5408\u4e91\u573a\u666f\u4e0b\u7684\u6709\u635f\u56de\u9000\u4e0e DSCP \u6620\u5c04\u4fee\u590d - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/115083.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"RoCE v2 \u8de8\u7f51\u6bb5\u901a\u4fe1\u964d\u7ea7\u9632\u7ebf\uff1a\u6df7\u5408\u4e91\u573a\u666f\u4e0b\u7684\u6709\u635f\u56de\u9000\u4e0e DSCP \u6620\u5c04\u4fee\u590d - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u5728\u7edd\u5927\u591a\u6570 AI \u667a\u7b97\u7f51\u7edc\u767d\u76ae\u4e66\u4e2d&#xff0c;\u5173\u4e8e RoCE v2&#xff08;\u4ee5\u592a\u7f51 RDMA&#xff09;\u7684\u67b6\u6784\u8bbe\u8ba1\u90fd\u5efa\u7acb\u5728\u4e00\u4e2a\u6781\u5176\u4e25\u82db\u7684\u7269\u7406\u5047\u8bbe\u4e4b\u4e0a&#xff1a;\u6240\u6709 GPU 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