From mboxrd@z Thu Jan  1 00:00:00 1970
From: jgunthorpe@obsidianresearch.com (Jason Gunthorpe)
Date: Wed, 3 May 2017 09:53:16 -0600
Subject: [PATCH v4, under testing] nvme-rdma: support devices with queue
 size < 32
In-Reply-To: <780938034.8003164.1493824767084.JavaMail.zimbra@kalray.eu>
References: <79901165.5342369.1493805915415.JavaMail.zimbra@kalray.eu>
 <823aa3f0-685f-4569-11d6-238cc4f0b126@grimberg.me>
 <780938034.8003164.1493824767084.JavaMail.zimbra@kalray.eu>
Message-ID: <20170503155316.GA14334@obsidianresearch.com>

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