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SubjectRe: [BENCHMARK] I/O regression after 2.6.0-test5


I don't know how useful this might but. I've been trying to
track down which patches to as-iosched resulted in the performance
drop. The results so far are a little confusing. I have been
running reaim on an 8-way system, comparing as-iosched performance
with deadline, on each kernel version. The numbers are "number
of jobs per minute". So, larger is better.

Deadline As-iosched
2.6.0-test5 8542 8589
2.6.0-test5-mm1 8303 8401
2.6.0-test5-mm2 8309 8224
2.6.0-test5-mm3 8222 8417
2.6.0-test6 8302 6934 ****
2.6.0-test6-mm1 8375 8163
2.6.0-test6-mm2 ??? 8309

I'm still getting data on test6-mm*. It's curious that
performance dropped for test6, but came back for test6-mm1.

On Wed, Oct 22, 2003 at 11:30:28AM -0700, Dave Olien wrote:
>
> Sorry, this patch didn't fix our performance problems. Mary just
> finished running dbt2 on test8 with your patch:
>
> NOTPM kernel scheduler
> 965 2.6.0-test8-np AS
> 1632 2.6.-test6-mm4 deadline
>
> This is an 8-way system with DAC960 and 12 LUNs, using raw devices.
> That's still quite a sizeable drop.
>
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