Re: cfq-iosched: a regression

[Justin TerAvest]

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@xxxxxxxxx> 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@xxxxxxxxxx>
> 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@xxxxxxxxx>
> Reported-by: Shaohua Li<shaohua.li@xxxxxxxxx>
>
>
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