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Message-ID: <46276CF8.1030109@bull.net> Date: Thu, 19 Apr 2007 15:22:00 +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: >>> 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. > That's done too. Now I've got the same results in 2.6.21 as in 2.6.20. Thanks, Valérie - 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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