From: Shaohua Li <shaohua.li@intel.com>
To: Justin TerAvest <teravest@google.com>
Cc: Jens Axboe <jaxboe@fusionio.com>,
lkml <linux-kernel@vger.kernel.org>,
"Shi, Alex" <alex.shi@intel.com>
Subject: Re: cfq-iosched: a regression
Date: Fri, 19 Aug 2011 08:21:35 +0800 [thread overview]
Message-ID: <1313713295.29510.1.camel@sli10-conroe> (raw)
In-Reply-To: <CAN5ZDdewpvg=82O69yGSXJczJMZrfqrLNS=RQiD2Ne2RqQTF1w@mail.gmail.com>
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@intel.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@google.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@intel.com>
> > Reported-by: Shaohua Li<shaohua.li@intel.com>
> >
> >
next prev parent reply other threads:[~2011-08-19 0:20 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-16 2:47 Shaohua Li
2011-08-18 20:22 ` Justin TerAvest
2011-08-19 0:21 ` Shaohua Li [this message]
2011-08-19 6:33 ` Jens Axboe
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