Excessive NAKs in Infiniband environment

Solution Verified - Updated -

Issue

  • Application using IBM Low Latency Messaging (WLLM) using Reliable Multicast on Infiniband on RHEL6.3, is losing streams, and showing a very high NAK packet count.

Environment

  • Red Hat Enterprise Linux 6.3
  • Red Hat Enterprise MRG Realtime 2.2
  • Mellanox ConnectX HCA
  • IBM Websphere Low Latency Messaging (WLLM)

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