linux-kernel - Re: Performance degradation with FFSB between 2.6.20 and 2.6.21-rc7

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Message-ID: <20070419115840.GA11780@kernel.dk>
Date:	Thu, 19 Apr 2007 13:58:42 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Valerie Clement <valerie.clement@...l.net>
Cc:	ext4 development <linux-ext4@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Performance degradation with FFSB between 2.6.20 and 2.6.21-rc7

On Thu, Apr 19 2007, Valerie Clement wrote:
> Jens Axboe wrote:
> >Please tell me how you are running ffsb, and also please include a
> >dmessg from a booted system.
> >
> Hi,
> our mails crossed! please see my response to Andrew.
> You could reproduce the problem with dd command as suggested, it's more 
> easy.
> I'm sending you the dmesg info. For my tests I used the scsci sdc device.

Thanks, it does. Can you try one thing for me? If you run the test on
sdc, try doing:

# echo 64 > /sys/block/sdc/queue/iosched/quantum

and repeat the test.

-- 
Jens Axboe

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