From: Jeff Moyer <jmoyer@redhat.com>
To: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: linux-kernel@vger.kernel.org, linux-ext4@vger.kernel.org,
jens.axboe@oracle.com, vgoyal@redhat.com
Subject: Re: [PATCH 0/4 v4] ext3/4: enhance fsync performance when using CFQ
Date: Wed, 26 May 2010 11:33:17 -0400 [thread overview]
Message-ID: <x49sk5ebruq.fsf@segfault.boston.devel.redhat.com> (raw)
In-Reply-To: <20100519105706.8821.A69D9226@jp.fujitsu.com> (KOSAKI Motohiro's message of "Wed, 19 May 2010 11:05:20 +0900 (JST)")
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> 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
prev parent reply other threads:[~2010-05-26 15:33 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-18 18:20 [PATCH 0/4 v4] ext3/4: enhance fsync performance when using CFQ Jeff Moyer
2010-05-18 18:20 ` [PATCH 1/4] cfq-iosched: Keep track of average think time for the sync-noidle workload Jeff Moyer
2010-05-18 20:52 ` Vivek Goyal
2010-05-18 21:02 ` Vivek Goyal
2010-06-01 19:31 ` Jeff Moyer
2010-05-18 18:20 ` [PATCH 2/4] block: Implement a blk_yield function to voluntarily give up the I/O scheduler Jeff Moyer
2010-05-18 21:07 ` Vivek Goyal
2010-05-18 21:44 ` Vivek Goyal
2010-06-01 20:01 ` Jeff Moyer
2010-05-18 18:20 ` [PATCH 3/4] jbd: yield the device queue when waiting for commits Jeff Moyer
2010-05-18 18:20 ` [PATCH 4/4] jbd2: yield the device queue when waiting for journal commits Jeff Moyer
2010-05-19 2:05 ` [PATCH 0/4 v4] ext3/4: enhance fsync performance when using CFQ KOSAKI Motohiro
2010-05-26 15:33 ` Jeff Moyer [this message]
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