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Message-ID: <20070419124630.GD11780@kernel.dk> Date: Thu, 19 Apr 2007 14:46:30 +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: > >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. Wonderful, now try the patch I sent in the next mail and repeat the test. -- Jens Axboe - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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