~/talk

Tuning Linux TCP for data-center networks

on YouTube 31m
Talkat Linux Plumbers Conference 2022 · 2022-09-12..09-14· [networking]

speaker

name:Yuchung Cheng
links:none on file

resources

video:https://youtu.be/0me0xVCSffc
slides:none on file

summary

Data-center tuning focuses on keeping queues on hosts not switches: enable ECN-aware congestion control (e.g., ECTCP or BBRv2), disable idle cwnd shrink, use TCP Fast Open and pacing to avoid million-flow bursts, and size TCP buffers for long-haul links (London–Singapore ~200 ms). Implement dynamic IPv6 flow-label load balancing (protective load balancing) to shift hotspots, and add TCP telemetry tying RPC messages to per-socket stats—measurements show network is the culprit less than one third of the time; much delay comes from queuing and CPU/copy hotspots.

AI-written summary · about

chapters (9)

  1. 0:00Introduction
  2. 1:47Data center network overview
  3. 5:14Optimizing network throughput
  4. 9:05Dynamic load balancing
  5. 12:12WAN performance tuning
  6. 14:28Host CPU and memory efficiency
  7. 21:04TCP telemetry and profiling
  8. 25:52Advanced TCP features
  9. 28:47Future challenges and conclusion

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