linux-ext4 - Re: Performance degradation with FFSB between 2.6.20 and 2.6.21-rc7

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Message-ID: <4627644E.7010002@bull.net>
Date:	Thu, 19 Apr 2007 14:45:02 +0200
From:	Valerie Clement <valerie.clement@...l.net>
To:	Jens Axboe <jens.axboe@...cle.com>
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

Jens Axboe wrote:
> 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.
> 

OK, that's done.

With the change of quantum, the throughput scores are now a little bit 
better in 2.6.21 than in 2.6.20.

   Valérie

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