[openib-general] segmentation fault in ibv_modify_srq

[Sayantan Sur]

Roland,

* On Oct,13 Roland Dreier<rolandd at cisco.com> wrote :
>     Sayantan> I noticed that the test re-posts buffers only when the
>     Sayantan> outstanding recv count is <= 1. I set a SRQ limit as
>     Sayantan> max_recv - 5. So, I should get the event when 5 WQEs are
>     Sayantan> consumed from the SRQ, right?
> 
> Yes, your code is correct.  The problem was that the mthca kernel
> driver was dispatching SRQ events incorrectly, so the event never
> reached userspace.  I've checked in a fix for that, and I'm going to
> queue the SRQ limit event stuff for 2.6.15 (now that I've seen it
> working).
> 
> BTW, in your code, you have:
> 
> 		fprintf(stderr, "  event_type %d, port %d\n", event.event_type,
> 		       event.element.port_num);
> 
> it would be more sensible to print event.element.srq here, since
> you're expecting an SRQ event.

Thanks for the fix!! I have updated our systems, and am able to see the
event. Thanks for the tip too. My async function was a quick copy from
the example asyncwatch.c :-)

Thanks,
Sayantan.

> 
>  - R.

-- 
http://www.cse.ohio-state.edu/~surs