Messages in this thread | | | Date | Thu, 19 Apr 2007 14:45:02 +0200 | From | Valerie Clement <> | Subject | Re: Performance degradation with FFSB between 2.6.20 and 2.6.21-rc7 |
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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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