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ConnectX-4/5 (mlx5) Infiniband showing low bandwidth when using Unreliable Datagram (UD) Queue Pair (QP) with rdmacm after Mellanox firmware update

Solution In Progress - Updated 2018-10-30T15:03:13+00:00 -

Issue

Reduction in bandwidth on ConnectX-4 & ConnectX-5 cards with firmware branch 12.17.x (or higher).

Environment

Red Hat Enterprise Linux (RHEL) 7
libmlx5 / rdma-core
ConnectX-4 & ConnectX-5 with firmware version 12.17.1010 (or higher)

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