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Hostping: Diagnosing Intra-host Network Bottlenecks in RDMA Servers

on YouTube 15m
Talkat NSDI 2023 · 2023-04-17..04-19· [networking, distributed-systems]

speakers

name:Kefei Liu
links:none on file
name:Zhuo Jiang
links:none on file
name:Jiao Zhang
links:none on file
name:Haoran Wei
links:none on file
name:Xiaolong Zhong
links:none on file
name:Lizhuang Tan
links:none on file
name:Tian Pan
links:none on file
name:Tao Huang
links:none on file

resources

video:https://youtu.be/F8RvUMYmUIQ
slides:none on file

summary

Hostping runs loopback tests between RNICs and endpoints to measure intra-host latency and bandwidth and uses baseline comparison plus a binary network tomography–style inference to pinpoint faulty links. It diagnoses hardware faults (PCIe/PSI link failures, memory-channel and CPU-port faults), misconfigurations (ATS/ACS), and contention (overloaded UPL), and adapts tests when servers are busy. Deployed on 300+ A100 servers, it reveals six unseen bottlenecks and shows examples where PCIe latency rising from ~1µs to 2.4µs halves RDMA bandwidth.

AI-written summary · about

chapters (8)

  1. 0:00Intro
  2. 0:29Background & Motivation
  3. 4:11Understanding: Symptoms of Intra-host Bottlenecks
  4. 6:13Hostping Design: Core Idea
  5. 7:16Hostping Design: Bottleneck Diagnosis (Idle Status)
  6. 10:58Hostping Design: Bottleneck Diagnosis (Busy Status)
  7. 12:45Evaluation
  8. 14:34Conclusion

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