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

[Valerie Clement]

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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