linux-kernel - Re: cfq-iosched: a regression

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Message-ID: <CAN5ZDdewpvg=82O69yGSXJczJMZrfqrLNS=RQiD2Ne2RqQTF1w@mail.gmail.com>
Date:	Thu, 18 Aug 2011 13:22:22 -0700
From:	Justin TerAvest <teravest@...gle.com>
To:	Shaohua Li <shaohua.li@...el.com>
Cc:	Jens Axboe <jaxboe@...ionio.com>,
	lkml <linux-kernel@...r.kernel.org>,
	"Shi, Alex" <alex.shi@...el.com>
Subject: Re: cfq-iosched: a regression

Hi Shaohua,

What was the workload you were running to find this regression?

On Mon, Aug 15, 2011 at 7:47 PM, Shaohua Li <shaohua.li@...el.com> wrote:
> We have a kernel build regression since 3.1-rc1, which is about 10%
> regression. The kernel source is in an ext3 filesystem.
> Alex Shi bisect it to commit:
> commit a07405b7802691d29ab3b23bdc76ee6d006aad0b
> Author: Justin TerAvest <teravest@...gle.com>
> Date:   Sun Jul 10 22:09:19 2011 +0200
>
>    cfq: Remove special treatment for metadata rqs.
>
> Apparently this is caused by lack metadata preemption, where ext3/ext4
> do use READ_META. I didn't see a way to fix the issue, so suggest
> reverting the patch.
>
> Reported-by: Alex Shi<alex.shi@...el.com>
> Reported-by: Shaohua Li<shaohua.li@...el.com>
>
>
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