Re: [PATCH 0/4 v4] ext3/4: enhance fsync performance when using CFQ

[Jeff Moyer]

KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx> writes:

> Hi Jeff,
>
>> This patch series addresses a performance problem experienced when running
>> io_zone with small file sizes (from 4KB up to 8MB) and including fsync in
>> the timings.  A good example of this would be the following command line:
>>   iozone -s 64 -e -f /mnt/test/iozone.0 -i 0
>> As the file sizes get larger, the performance improves.  By the time the
>> file size is 16MB, there is no difference in performance between runs
>> using CFQ and runs using deadline.  The storage in my testing was a NetApp
>> array connected via a single fibre channel link.  When testing against a
>> single SATA disk, the performance difference is not apparent.
>
> offtopic:
>
> Can this patch help to reduce a pain of following much small files issue?
>
> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=578635

Perhaps.  I don't have a debian system handy to test that, though.

Cheers,
Jeff
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