Messages in this thread | | | Date | Fri, 19 Aug 2011 08:33:57 +0200 | From | Jens Axboe <> | Subject | Re: cfq-iosched: a regression |
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On 2011-08-16 04:47, Shaohua Li 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>
I had a gut feeling on that meta data, it's hard to know exactly where it helps at this point. I'll revert the commit and then we can diagnose this on the side.
-- Jens Axboe
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