Re: 2.6.9-rc1-mm1

Rafael J. Wysocki
2004-08-27T22:28:33Z

On Friday 27 of August 2004 23:54, Rick Lindsley wrote:
> > Rafael, what baseline release are you comparing to? I should be able
> > to provide some tools to measure the effect on updatedb directly for
> > both 2.6.9-rc1 and your baseline (so long as it's 2.6-based)
>
> 2.6.8.1, for example. I'd like to compate it with the 2.6.9-rc1-mm1,
> which contains the Nick's scheduler (2.6.9-rc1 has the same scheduler as
> 2.6.8.1, AFAIK).
>
> Okay. A schedstats patch for 2.6.8.1 is available at
>
> http://eaglet.rain.com/rick/linux/schedstat/patches/schedstat-2.6.8.1
> or
> http://oss.software.ibm.com/linux/patches/?patch_id=730
>
> You can also pick up the program "latency.c" at
>
> http://eaglet.rain.com/rick/linux/schedstat/v9/latency.c
>
> With these two things in hand, you should be able to measure the latency
> on 2.6.8.1 of a particular process.
>
> A patch is not necessary for 2.6.9-rc1-mm1 (schedstats is already in there)
> but you will need to config the kernel to use it. Then retrieve a slightly
> different latency.c:
>
> http://eaglet.rain.com/rick/linux/schedstat/v10/latency.c
>
> since 2.6.9-rc1-mm1 output format is different (as you noted, it's a
> different scheduler.) Then you should be able to see if the latency of
> a particular process (updatedb, for instance) changes.

Thanks a lot Rick, I'll give it a try tomorrow.

Regards,
RJW

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