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RoCE course / 2. Congestion / Checkpoint

Module 2 checkpoint

Build and defend the whole marking-and-congestion chain — application ToS through host trust state to switch queue, PFC vs ECN vs ZTR-RTT — and say which one a customer's symptom actually points at.

Module 2 of 5 in RoCE and RDMA for AI fabrics14 questionspass mark 80%about 12 minbelow the mark, retry after 24 h

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What it covers

  1. 2.1ToS, DSCP, PCP, SL: where marking gets lost
  2. 2.2Host QoS with mlnx_qos: trust state, prio2tc, ETS
  3. 2.3PFC, lossless and the case for lossy
  4. 2.4ECN, CNP and DCQCN: closing the loop
  5. 2.5Zero Touch RoCE, ZTR-RTT CC and DOCA PCC
  6. 2.6Packet spraying and the reordering it hands to the NIC