Lee_FLATTEN THE CURVE：SOURCE FLOW CONTROL FOR SUB-RTT MANAGEMENT OF NETWORK TAIL LATENCY.pdf

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2021-04-14

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FLATTEN THE CURVE: SOURCE FLOW CONTROL

FOR SUB-RTT MANAGEMENT OF NETWORK TAIL LATENCY

Jeongkeun (JK) Lee, Principal Engineer

w/ Jeremias Blendin, Yanfang Le and Grzegorz Jereczek

Intel Barefoot

2021 OFA Virtual Workshop

HIGH-PERFORMANCE NETWORKING TODAY

High performance Networking (HPN)

 Remote direct memory access traffic (RDMA)

 Protocols are implemented in NIC hardware

 Dedicated networks with low latency ~20us RTT

 Main performance metric: flow completion time

State of the art: RoCEv2

 Lossless Ethernet: PFC to prevent packet loss

 ECN-CNP congestion feedback from rcv to src

 Drawbacks: PFC storm, deadlock

 HoL blocking slows down the network fabric

Agg + Core

switches

Src ToR Switch

Port 1

Dst ToR Switch

5. Prevent packet loss

PFC pause upstream port

Backpressure towards src

host 1

Port 2

host 2

Rcv host

Egress

Ingress

1. Incast traffic

2. ECN

after q

delay

3. ACK

❌

4. ACK

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ofa2021

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OpenFabrics Alliance (Virtual) Workshop 2021（PPT汇总）（共49篇）

开放结构联盟（OFA）是致力于HPC（高性能计算）的互连网络。一年一度的OFA研讨会是在开发结构，部署结构以及创建依赖结构的应用程序的人员之间促进协作的主要手段。这是同类活动中唯一的一次，面料开发人员和用户可以讨论新兴的互连技术，就未来的行业需求进行协作，并解决当今存在的问题。

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