Excessive NAKs in Infiniband environment

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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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