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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