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

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Date:	Fri, 19 Aug 2011 08:21:35 +0800
From:	Shaohua Li <shaohua.li@...el.com>
To:	Justin TerAvest <teravest@...gle.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

On Fri, 2011-08-19 at 04:22 +0800, Justin TerAvest wrote:
> Hi Shaohua,
> 
> What was the workload you were running to find this regression?
kernel build as I declared below.

Thanks,
Shaohua

> 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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