On 11/29/2010 11:34 AM, Robert D. Russell wrote:
Steve:
Thanks, that fix works fine.
Is the need to do this documented anywhere?
See section 8.2.1 of the iWARP Verbs draft at:
http://tools.ietf.org/html/draft-hilland-rddp-verbs-00#section-8.2.1.
The last big paragraph in 8.2.1 spells it all out.
There should be a similar requirement in the IBTA IB Verbs specification...
Steve.
Thanks,
Bob Russell
[email protected]
On Mon, 29 Nov 2010, Steve Wise wrote:
On 11/29/2010 10:31 AM, Robert D. Russell wrote:
Hi:
I have hit the following strange situation and would appreciate an
explanation as to how to fix it.
When calling ibv_create_cq() to create a queue pair, I set
sq_sig_all = 0.
When calling ibv_post_send() I set send_flags in the work request to 0
(so that IBV_SEND_SIGNALED is NOT set).
When calling ibv_poll_cq() I do not get any IBV_WC_SEND completions.
I do not create a completion channel, nor do I use ibv_req_notify_cq()
or ibv_get_cq_event() or ibv_ack-cq_events().
So far, so good, and this works for a few ibv_post_send()s.
However, as soon as I call ibv_post_send() more than max_send_wr times,
it fails on Mellanox IB cards, and Intel and Chelsio iWARP cards,
but it works fine on QLogic IB cards.
It appears that the send work completions ARE being generated
incorrectly
(or at least some internal counter is being incremented incorrectly)
even 'tho' they are correctly NOT being put into the completion queue.
Is there some other way to clear this counter or to get this to work?
Thanks,
Bob Russell
[email protected]
You must signal one WR for every SQ-depth worth of WRs posted. IE:
If your SQ depth is 16, you must signal at least one out of every
16. This ensures proper flow control for HW resources.
Steve.
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