Michael> In investigating this issue I discovered what I belive is
    Michael> a race condition in mthca:

Thanks, good catch.  I'll apply your patch.  In the future can you add
a Signed-off-by: line to your patches?

    Michael> I also would like to suggest implementing CQ doorbell
    Michael> coalescing in mthca, to reduce the number of CQ
    Michael> doorbells.

Sounds like a good idea...

    Michael> Unfortunately this patch does not seem to solve the
    Michael> overrun problem, so may be another problem. That will
    Michael> need more looking into.

OK.  At this point do you think it's a FW problem or a driver problem?

Thanks,
  Roland
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