From: Shaohua Li <shaohua.li@intel.com>
To: Jens Axboe <jaxboe@fusionio.com>
Cc: teravest@google.com, lkml <linux-kernel@vger.kernel.org>,
"Shi, Alex" <alex.shi@intel.com>
Subject: cfq-iosched: a regression
Date: Tue, 16 Aug 2011 10:47:06 +0800 [thread overview]
Message-ID: <1313462826.27321.22.camel@sli10-conroe> (raw)
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 reply other threads:[~2011-08-16 2:46 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-16 2:47 Shaohua Li [this message]
2011-08-18 20:22 ` Justin TerAvest
2011-08-19 0:21 ` Shaohua Li
2011-08-19 6:33 ` Jens Axboe
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