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From: Rik van Riel on 24 May 2010 16:50
On 05/09/2010 01:49 PM, Ingo Molnar wrote:
> * Arjan van de Ven<arjan(a)infradead.org> wrote:
>
>> [Version 2 includes the acks/etc. Andrew: no changes from the patches that
>> are in -mm]
>>
>> There have been various reports of the ondemand governor causing some
>> serious performance issues, one of the latest ones from Andrew. There are
>> several fundamental issues with ondemand (being worked on), but the report
>> from Andrew can be fixed relatively easily.
>>
>> The fundamental issue is that ondemand will go to a (too) low CPU frequency
>> for workloads that alternatingly disk and CPU bound...
>
> I've applied your series to sched/core and started testing it, thanks Arjan!

This code seems to help significantly with some workloads,
allowing more systems to use the ondemand governor (and
having fewer systems waste power by using the performance
governor all the time).

It would be nice to see it in 2.6.35

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From: Ingo Molnar on 28 May 2010 05:40

* Rik van Riel <riel(a)redhat.com> wrote:

> On 05/09/2010 01:49 PM, Ingo Molnar wrote:
> >* Arjan van de Ven<arjan(a)infradead.org> wrote:
> >
> >>[Version 2 includes the acks/etc. Andrew: no changes from the patches that
> >>are in -mm]
> >>
> >>There have been various reports of the ondemand governor causing some
> >>serious performance issues, one of the latest ones from Andrew. There are
> >>several fundamental issues with ondemand (being worked on), but the report
> >>from Andrew can be fixed relatively easily.
> >>
> >>The fundamental issue is that ondemand will go to a (too) low CPU frequency
> >>for workloads that alternatingly disk and CPU bound...
> >
> >I've applied your series to sched/core and started testing it, thanks Arjan!
>
> This code seems to help significantly with some workloads,
> allowing more systems to use the ondemand governor (and
> having fewer systems waste power by using the performance
> governor all the time).
>
> It would be nice to see it in 2.6.35

Yeah, it's uptream now :-)

Cheers,

Ingo
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