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

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Date:	Mon, 07 Dec 2009 09:13:00 -0500
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Jens Axboe <jens.axboe@...cle.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

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.

Cheers,
Jeff
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