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

[Valerie Clement <valerie.clement@bull.net>]

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

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