Re: ibv_rc_pingpong, rping, and other tools hang with Linux 4.10.0 and rdma-core 13

[Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>]

On Mon, Feb 27, 2017 at 12:02:07PM -0500, Josh Beavers wrote:

> I just confirmed that reverting the C11 atomics commit (6b26a9e24739)
> fixes ibv_rc_pingpong on my two at91 ARM boards.  For some reason the
> first few packets seem to send slowly, but once it gets going the rest
> send quickly.

How are you able to get it to compile? Without that commit ARM32
should blow up?

> Jason, was it intentional that rmb() was removed with no replacement
> in rxe_post_one_recv()?   See
> https://github.com/linux-rdma/rdma-core/commit/6b26a9e24739576ac3f4ae308485389a5b285497?diff=split#diff-f6b2d2321c2b3273e3453d055a62fa98
> for details.

Yes, the rmb should have been a wmb and the atomic_thread_fence added
to in advance_producer correctly replaces it.

> Unfortunately, even after reverting the C11 atomics commit, I still
> seem to observe "Couldn't post send" failures which kill the ping
> occasionally.  Is this a known issue?

Sounds like this is unrelated to 6b26..

Jason
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