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

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Message-ID: <20100405194803.GC23670@thunk.org>
Date:	Mon, 5 Apr 2010 15:48:03 -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 02:36:07PM -0400, Jeff Moyer wrote:
> >
> > 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

iozone is showing performance regressions or performance improvements?
I thought the point of this patch was to improve iozone benchmarks?

  	      	       	    	      - Ted
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