From: Jeff Moyer <jmoyer@redhat.com>
To: axboe@kernel.dk, vgoyal@redhat.com
Cc: linux-kernel@vger.kernel.org, linux-ext4@vger.kernel.org
Subject: [PATCH 0/3 v5][RFC] ext3/4: enhance fsync performance when using CFQ
Date: Tue, 22 Jun 2010 17:34:59 -0400 [thread overview]
Message-ID: <1277242502-9047-1-git-send-email-jmoyer@redhat.com> (raw)
Hi,
Running iozone with the fsync flag, or fs_mark, the performance of CFQ is
far worse than that of deadline for enterprise class storage when dealing
with file sizes of 8MB or less. I used the following command line as a
representative test case:
fs_mark -S 1 -D 10000 -N 100000 -d /mnt/test/fs_mark -s 65536 -t 1 -w 4096 -F
When run using the deadline I/O scheduler, an average of the first 5 numbers
will give you 448.4 files / second. CFQ will yield only 106.7. With
this patch series applied (and the two patches I sent yesterday), CFQ now
achieves 462.5 files / second.
This patch set is still an RFC. I'd like to make it perform better when
there is a competing sequential reader present. For now, I've addressed
the concerns voiced about the previous posting.
Review and testing would be greatly appreciated.
Thanks!
Jeff
---
New from the last round:
- removed the think time calculation I added for the sync-noidle service tree
- replaced above with a suggestion from Vivek to only guard against currently
active sequential readers when determining if we can preempt the sync-noidle
service tree.
- bug fixes
Over all, I think it's simpler now thanks to the suggestions from Jens and
Vivek.
[PATCH 1/3] block: Implement a blk_yield function to voluntarily give up the I/O scheduler.
[PATCH 2/3] jbd: yield the device queue when waiting for commits
[PATCH 3/3] jbd2: yield the device queue when waiting for journal commits
next reply other threads:[~2010-06-22 21:35 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-22 21:34 Jeff Moyer [this message]
2010-06-22 21:35 ` [PATCH 1/3] block: Implement a blk_yield function to voluntarily give up the I/O scheduler Jeff Moyer
2010-06-23 5:04 ` Andrew Morton
2010-06-23 14:50 ` Jeff Moyer
2010-06-24 0:46 ` Vivek Goyal
2010-06-25 16:51 ` Jeff Moyer
2010-06-25 18:55 ` Jens Axboe
2010-06-25 19:57 ` Jeff Moyer
2010-06-25 20:02 ` Vivek Goyal
2010-06-22 21:35 ` [PATCH 2/3] jbd: yield the device queue when waiting for commits Jeff Moyer
2010-06-22 21:35 ` [PATCH 3/3] jbd2: yield the device queue when waiting for journal commits Jeff Moyer
2010-06-22 22:13 ` [PATCH 0/3 v5][RFC] ext3/4: enhance fsync performance when using CFQ Joel Becker
2010-06-23 9:20 ` Christoph Hellwig
2010-06-23 13:03 ` Jeff Moyer
2010-06-23 9:30 ` Tao Ma
2010-06-23 13:06 ` Jeff Moyer
2010-06-24 5:54 ` Tao Ma
2010-06-24 14:56 ` Jeff Moyer
2010-06-27 13:48 ` Jeff Moyer
2010-06-28 6:41 ` Tao Ma
2010-06-28 13:58 ` Jeff Moyer
2010-06-28 23:16 ` Tao Ma
2010-06-29 14:56 ` Jeff Moyer
2010-06-30 0:31 ` Tao Ma
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