linux-kernel - Re: [patch/rft] jbd2: tag journal writes as metadata I/O

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Date:	Mon, 05 Apr 2010 14:36:07 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	tytso@....edu
Cc:	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
	jens.axboe@...cle.com, esandeen@...hat.com
Subject: Re: [patch/rft] jbd2: tag journal writes as metadata I/O

tytso@....edu writes:

> On Thu, Apr 01, 2010 at 03:04:54PM -0400, Jeff Moyer wrote:
>> 
>> So, I'm submitting this patch for comments and testing.  I have a
>> similar patch for jbd that I will submit if folks agree that this is a
>> good idea.
>
> Added to the ext4 patch queue.
>
> What benchmark were you using to test small file writes?  This looks
> good to me as well, but we might want to do some extra benchmarking
> just to be sure we're not accidentally introducing a performance
> regression.

iozone showed regressions for write and re-write in runs that include
fsync timings for small files (<8MB).  Here's the command line used for
testing:

iozone -az -n 4k -g 2048m -y 1k -q 1m -e

I also ran fs_mark using the following command line:

fs_mark -S 1 -D 100 -N 1000 -d /mnt/test/fs_mark -s 65536 -t 1 -w 4096

I'll let you know if there are any regressions caused by this patch in
any of our other testing.

Cheers,
Jeff
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