Infiniband - dog slow on newer kernels

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Hi All,

Is anybody here use Infiniband on Fedora? More specifically IPoIB. I have two machines directly connected via IB, one running F23 and the other running F22. The IB card I have in both machines is a dual port Mellanox Technologies MT25418. Normally I can push about 9.8Gbit/sec between the two machines, however if I use a kernel newer than about v4.0.4 on the F22 machine or a kernel newer than about v4.2.3 on the F23 machine, the maximum transfer rate drops to 760K/sec.

Is this a kernel bug, or has something significantly changed?

--
Ian Chapman.
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