linux-kernel - Re: [PATCH] cfq-iosched: reduce write depth only if sync was delayed

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Date:	Mon, 7 Dec 2009 15:41:50 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Jeff Moyer <jmoyer@...hat.com>
Cc:	Corrado Zoccolo <czoccolo@...il.com>,
	Linux-Kernel <linux-kernel@...r.kernel.org>,
	Vivek Goyal <vgoyal@...hat.com>
Subject: Re: [PATCH] cfq-iosched: reduce write depth only if sync was
	delayed

On Mon, Dec 07 2009, Jeff Moyer wrote:
> Jens Axboe <jens.axboe@...cle.com> writes:
> 
> > On Sun, Dec 06 2009, Corrado Zoccolo wrote:
> >> Hi Jeff,
> >> I remember you saw large performance drop on your SAN for sequential
> >> writes with low_latency=1.  Can you test if Shaohua's and this patch
> >> fix allow to recover some bandwidth?  I think that enabling the queue
> >> depth ramp up only if a sync request was delayed should disable it for
> >> fast hardware like yours, so you should not be seeing the slowdown any
> >> more.
> >
> > I queued this up for post inclusion into 2.6.33, with the time_after()
> > fixed.
> >
> > The patch was word-wrapped, btw.
> 
> So in what branch can I find this fix?  Once I know that I can queue up
> some tests.

It's in next-2.6.33

-- 
Jens Axboe

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