[openib-general] Re: openib-general Digest, Vol 22, Issue 114

[Roland Dreier]

    Shirley> After completion handler receives the notification, don't
    Shirley> poll the CQ right away, and wait for more WIKIs in
    Shirley> CQ. That way can reduce the CQ lock overhead.

That's interesting... it makes sense, and it argues in favor of
deferring CQ polling to a kernel thread.  Of course this will hurt
ping-pong latency.  Maybe it's better to just implement NAPI though...

    Shirley> I found that there is some problem to increase the NUM_WC
    Shirley> on recv. It hurts the performance lots. Do you have any
    Shirley> clue?

Is this on ehca or mthca?  I couldn't explain it on mthca, but on ehca
maybe there's a bug in generating CQ events ??

 - R.