linux-kernel - Re: blk-mq: refactor request allocation

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Message-ID: <20140528051919.GA21566@lst.de>
Date:	Wed, 28 May 2014 07:19:19 +0200
From:	Christoph Hellwig <hch@....de>
To:	Jens Axboe <axboe@...com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: blk-mq: refactor request allocation

On Tue, May 27, 2014 at 02:58:08PM -0600, Jens Axboe wrote:
> On 05/27/2014 12:59 PM, Christoph Hellwig wrote:
> > This series streamlines the request allocation path.
> > 
> 
> Series looks innocuous enough to me, but it's about a 1.5% performance
> drop here with an actual device. These tests are very stable, anything
> over ~0.1% is definitely outside of noise. I repeated and rebooted a few
> times and tested both, it's persistent. No smoking guns in the profile.

Can you do a bisect to narrow it down to one of the patches?
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