Re: blk-mq: refactor request allocation

From: Christoph Hellwig
Date: Wed May 28 2014 - 01:19:26 EST


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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