From: Jens Axboe <axboe@kernel.dk>
To: Heinz Diehl <htd@fancy-poultry.org>
Cc: jmoyer@redhat.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] cfq-iosched: don't allow aliased requests to starve others
Date: Sat, 24 Jul 2010 12:03:01 +0200 [thread overview]
Message-ID: <4C4ABA55.2000204@kernel.dk> (raw)
In-Reply-To: <20100724080459.GA6500@fancy-poultry.org>
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
next prev parent reply other threads:[~2010-07-24 10:03 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-14 15:09 [PATCH] cfq-iosched: don't allow aliased requests to starve others Jeff Moyer
2010-07-14 19:01 ` Jeff Moyer
2010-07-23 4:25 ` Vivek Goyal
2010-07-23 15:07 ` Jeff Moyer
2010-07-23 16:17 ` Vivek Goyal
2010-07-24 9:30 ` Jens Axboe
2010-07-24 8:04 ` Heinz Diehl
2010-07-24 10:03 ` Jens Axboe [this message]
2010-07-26 13:17 ` Jeff Moyer
2010-08-02 11:54 ` Jens Axboe
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