linux-ext4 - Re: [patch/rft] jbd2: tag journal writes as metadata I/O

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Message-ID: <20100405210133.GG23670@thunk.org>
Date:	Mon, 5 Apr 2010 17:01:33 -0400
From:	tytso@....edu
To:	Jeff Moyer <jmoyer@...hat.com>
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

On Mon, Apr 05, 2010 at 04:41:48PM -0400, Jeff Moyer wrote:
> > Sorry, Ted, what I meant to say was that iozone showed differences
> > between deadline and cfq, where cfq's performance was much worse than
> > deadline's.
> 
> And to be 100% clear, with the patch, the performance differences
> between deadline and cfq were in the noise.

Right, and since most people don't actually change the I/O scheduler
from cfq, this is basically a performance improvement patch, which is
how I'm going to describe it.  :-)

						- Ted
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