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Date:	Sat, 31 May 2008 14:35:13 -0500
From:	Eric Sandeen <sandeen@...hat.com>
To:	Valerie Clement <valerie.clement@...l.net>
CC:	ext4 development <linux-ext4@...r.kernel.org>,
	Mingming Cao <cmm@...ibm.com>,
	"Jose R. Santos" <jrs@...ibm.com>
Subject: Re: Test results for ext4

Valerie Clement wrote:
> Hi all,
> 
> Since a couple of weeks, I did batches of tests to have some performance
> numbers for the new ext4 features like uninit_groups, flex_bg or
> journal_checksum on a 5TB filesystem.
> I tried to test allmost all combinations of mkfs and mount options, but
> I put only a subset of them in the result tables, the most significant
> for me.
> 
> I had started to do these tests on a kernel 2.6.26-rc1, but I'd got several
> hangs and crashes occuring randomly outside ext4, sometimes in the slab
> code or in the scsi driver eg., and which were not reproductible.
> Since 2.6.26-rc2, no crash or hang occur with ext4 on my system.
> 
> The first results and the test description are available here:
> http://www.bullopensource.org/ext4/20080530/ffsb-write-2.6.26-rc2.html
> http://www.bullopensource.org/ext4/20080530/ffsb-readwrite-2.6.26-rc2.html
> 

One other question on the tests; am I reading correctly that ext3 used
"data=writeback" but ext4 used the default data=ordered mode?

Thanks,
-Eric
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