From: jgunthorpe@obsidianresearch.com (Jason Gunthorpe)
Subject: [PATCH v4, under testing] nvme-rdma: support devices with queue size < 32
Date: Wed, 3 May 2017 09:53:16 -0600 [thread overview]
Message-ID: <20170503155316.GA14334@obsidianresearch.com> (raw)
In-Reply-To: <780938034.8003164.1493824767084.JavaMail.zimbra@kalray.eu>
On Wed, May 03, 2017@05:19:27PM +0200, Marta Rybczynska wrote:
> > where
> > queue->sig_limit = max(queue->queue_size / 2, 1);
>
> I tried to avoid that because this adds a division in the fast path Bart
> was unhappy about in v2.
The compiler switches divide/multiply by powers of two into fast bit shifts.
Jason
next prev parent reply other threads:[~2017-05-03 15:53 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-03 10:05 [PATCH v4, under testing] nvme-rdma: support devices with queue size < 32 Marta Rybczynska
2017-05-03 11:17 ` Leon Romanovsky
2017-05-03 15:08 ` Sagi Grimberg
2017-05-03 15:19 ` Marta Rybczynska
2017-05-03 15:45 ` Bart Van Assche
2017-05-03 15:53 ` Jason Gunthorpe [this message]
2017-05-03 15:58 ` Bart Van Assche
2017-05-03 16:01 ` Sagi Grimberg
2017-05-03 16:27 ` Leon Romanovsky
2017-05-03 16:37 ` Bart Van Assche
2017-05-03 16:49 ` Sagi Grimberg
2017-05-04 12:50 ` Marta Rybczynska
2017-05-17 9:02 ` Christoph Hellwig
2017-05-17 12:50 ` Marta Rybczynska
2017-05-03 16:17 ` Doug Ledford
2017-05-03 16:24 ` Bart Van Assche
2017-05-03 19:07 ` Doug Ledford
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