linux-kernel - Re: [PATCH] cfq-iosched: don't allow aliased requests to starve others

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Message-ID: <4C4ABA55.2000204@kernel.dk>
Date:	Sat, 24 Jul 2010 12:03:01 +0200
From:	Jens Axboe <axboe@...nel.dk>
To:	Heinz Diehl <htd@...cy-poultry.org>
CC:	jmoyer@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cfq-iosched: don't allow aliased requests to starve 
 others

On 07/24/2010 10:04 AM, Heinz Diehl wrote:
> On 14.07.2010, Jeff Moyer wrote: 
> 
>> Comments, as always, are welcome.
> 
> This patch, applied to 2.6.35-rc6, increases desktop interactivity
> _NOTICEABLY_ on my quadcore machine, and the machine stays rock-stable.
> I have now tested this patch with the latest 2.6.35-rc kernels over 
> 1 week.
> 
> Unfortunately, I can't provide some testing results which makes this
> statement more objective, but I'll do some synthetic testing in the next
> days.

It is extremely unlikely that this patch will have any impact on
"normal" workloads. To even hit a code path where it would make a
difference, you would need to use O_DIRECT IO, otherwise you cannot have
aliases in the IO scheduler.

-- 
Jens Axboe

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