The openib init script touches all sorts of weird things, betcha one
of those is your problem... See if you can narrow it down?
You can try loading the modules yourself to confirm it is not a module
problem:
modprobe mlx4_ib
modprobe ib_ipoib
mopdrobe ib_ucm
modprobe ib_uverbs
modprobe ib_umad
Thanks a lot Jason!
Loading the modules directly w/o using the init script is the
solution. No more side effects in the ethernet. The ipoib bandwidth
drops significantly though. I will look into the init script and try
to narrow it down.
Interestingly the problem does not show up w/o the HP GbE switch. I
isolated the nodes and connected them back to back, as well as with an
older 8-port unmanaged switch. In both cases I don't see the negative
effect.
Sebastian
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