智能无损网络技术白皮书

i目录1概述······························································································································· 11.1简介···························································································································11.2产生背景······················································································································11.2.1 RDMA的应用需求································································································11.2.2数据中心硬件发展的需求························································································11.3技术架构······················································································································12流量控制技术··················································································································· 32.1 PFC工作原理···············································································································32.2 PFC死锁检测···············································································································42.2.1 PFC死锁的产生···································································································42.2.2触发PFC死锁检测·······························································································52.2.3 PFC死锁判定······································································································52.2.4 PFC死锁恢复······································································································52.3 PFC死锁预防···············································································································62.3.1 PFC死锁预防的产生背景·······················································································62.3.2 PFC高风险业务流································································································62.3.3 PFC死锁预防工作原理··························································································73拥塞控制技术··················································································································· 83.1 ECN ···························································································································83.1.1基本概念·············································································································83.1.2实现原理·············································································································93.2 ECN Overlay ·············································································································· 113.2.1基本概念··········································································································· 113.2.2实现原理··········································································································· 123.3大小流区分调度··········································································································· 123.4 AI ECN ····················································································································· 133.4.1背景简介··········································································································· 133.4.2实现原理··········································································································· 143.5 IPCC ························································································································ 153.5.1基本概念··········································································································· 153.5.2实现原理··········································································································· 16 ii4.1 iNOF简介·················································································································· 194.2 iNOF组网·················································································································· 194.2.1 iNOF网络元素··································································································· 194.2.2 iNOF直连组网··································································································· 204.2.3 iNOF跨交换机组网····························································································· 204.3技术优点···················································································································· 224.4 H3C iNOF实现的技术特色···························································································· 225参考文献······················································································································· 22 1概述1.1简介智能无损网络是通过硬件架构、智能无损算法和一系列的网络技术，为人工智能、分布式存储、HPC（High Performance Computing，高性能计算）等应用场景提供的“无丢包、低时延、高吞吐”网络环境，用于加速计算和存储的效率，为数据中心构建统一融合的网络。1.2产生背景1.2.1 RDMA的应用需求RDMA（Remote Direct Memory Access，远程直接内存访问）技术的内核旁路机制允许应用与网卡之间直接读写数据，使得服务器内的数据传输时延降低。同时RDMA利用相关的硬件和网络技术，使服务器网卡之间可以直接读内存，实现了高吞吐量、超低时延和低CPU开销的