[openib-general] [PATCH/RFC 1/2] IB: Return "maybe_missed_event" hint from ib_req_notify_cq()

[Shirley Ma]

Roland Dreier <rdreier at cisco.com> wrote on 10/19/2006 07:39:25 PM:

>  > I have applied this patch and updated patch 2/2. You will send out an
>  > updated patch 2/2, I think.
>
> Sorry, messed that up.  I just sent out the patch.
No problem, I did same change.

> You mean you add more calls to ib_poll_cq()?  Where do you add them?
> Why does it help?
>
>  - R.
I run out of ideas why losing 2/3 of the throughput and got 476 trans/s. So
I assumed there was always a missed event, then ipoib would stay in its
napi poll within its scheduled time. That's why it helps. This is really a
hack, doesn't address the problem. It sacrificed cpu utilization and gained
the performance back. I need to understand how ehca reports missing event,
there might be some delay there?

Thanks
Shirley Ma
IBM Linux Technology Center
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