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Spectrum-X course / Module 3

Spectrum-X Ethernet AI fabrics with Cumulus Linux

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RoCE QoS

Turn a switch into a lossless RoCE fabric with one command, then know precisely what that command did, how to tune it, and which four counters answer 'RoCE is slow'.

  1. 3.1 How a RoCE packet gets classifiedThe DSCP that cannot exist
  2. 3.2 `nv set qos roce`: the one command and its five modesFive minutes, low risk
  3. 3.3 Tuning the lossless edge: PFC headroom, ECN thresholds, watchdogZero drops, and nothing is moving
  4. 3.4 Packet trimming and `lossy-multi-tc`Enable trimming everywhere, next Tuesday
  5. 3.5 Playbook: 'RoCE is slow'The ticket that says only 'RoCE is slow'
  6. Checkpoint