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From: "Hefty, Sean" <sean.hefty@intel.com>
To: Gal Pressman <galpress@amazon.com>, Jason Gunthorpe <jgg@ziepe.ca>
Cc: RDMA mailing list <linux-rdma@vger.kernel.org>
Subject: RE: ibv_req_notify_cq clarification
Date: Mon, 22 Feb 2021 18:38:48 +0000	[thread overview]
Message-ID: <MW3PR11MB46518F4C79C4114675F976F89E819@MW3PR11MB4651.namprd11.prod.outlook.com> (raw)
In-Reply-To: <e26a3e90-cc8b-d681-5d6b-4e363aa1933c@amazon.com>

> Running this with 32 iterations, the client does something like:
> - arm cq
> - post send x 32
> - wait for cq event
> - arm cq
> - poll cq (once, with batch size of 16)

This is a race.  The code should continue to read completions until the CQ is drained.

At this point, all completions may have been written to the CQ, and no new events will be generated.

> - no more post send (reached tot_iters)
> - wait for cq event (but an event has already been generated?)
> 
> And gets stuck?

- Sean

  parent reply	other threads:[~2021-02-22 18:40 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-18  9:13 ibv_req_notify_cq clarification Gal Pressman
2021-02-18 12:38 ` Bernard Metzler
2021-02-18 12:47   ` Gal Pressman
2021-02-18 13:59   ` Bernard Metzler
2021-02-18 12:53 ` Jason Gunthorpe
2021-02-18 15:52   ` Gal Pressman
2021-02-18 16:23     ` Jason Gunthorpe
2021-02-18 22:22       ` Tom Talpey
2021-02-18 22:51         ` Jason Gunthorpe
2021-02-18 23:07           ` Tom Talpey
2021-02-19  0:45             ` Jason Gunthorpe
2021-02-19 14:31               ` Tom Talpey
2021-02-19 14:42                 ` Jason Gunthorpe
2021-02-21  9:25       ` Gal Pressman
2021-02-22 13:46         ` Jason Gunthorpe
2021-02-22 15:36           ` Gal Pressman
2021-02-22 15:55             ` Jason Gunthorpe
2021-02-22 19:24               ` Gal Pressman
2021-02-22 19:37                 ` Jason Gunthorpe
2021-02-23 12:18                   ` Gal Pressman
2021-02-23 12:38                     ` Jason Gunthorpe
2021-02-22 22:41                 ` Hefty, Sean
2021-02-23 12:23                   ` Gal Pressman
2021-02-23 20:48                     ` Hefty, Sean
2021-02-22 18:38             ` Hefty, Sean [this message]
2021-02-22 19:26               ` Gal Pressman
2021-02-18 18:47     ` Bernard Metzler

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