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SubjectRe: [PATCH v2] cpuidle: Fix the menu governor to boost IO performance
On Mon, 14 Sep 2009 20:54:08 -0700
Andrew Morton <akpm@linux-foundation.org> wrote:

> On Tue, 15 Sep 2009 05:42:59 +0200 Arjan van de Ven
> <arjan@infradead.org> wrote:
>
> > Rather than adding a new governor temporarily, this just puts the
> > fixes into the existing menu governor.
>
> Oh, surprised. I wasn't actually expecting that to happen.
>
> <actually reads his email>
>
> > I don't mind either way, will replace.
>
> OK. I'm not particularly strongly opinionated either way.
>
> The timing is awkward. We could let it sit in Len's tree and
> linux-next for a couple of months or we could say what-the-hell and
> merge it.

If the performance impact wasn't this huge I'd say "let it sit".
As it is now, with a nearly 2x performance delta, I'd not be very happy
to expose linux users to this regression-like performance drop for
another 3 months.

(especially given all the scheduler performance attention there is right
now; picking the wrong C state has clearly very high impact in similar
areas)

>
> If the latter, your original merge plan sound better ;) But we should
> arrange for the new code to default to "on" for test coverage
> reasons. perhaps the original patch did that already?

the original patch defaulted to the new code yes.

redoing the split is not hard again.. just need to do a "cp" and put
the makefile glue back. I do like how the current patch shows exactly
which few things in the algorithm are changed..
(although it says 230 lines added, a lot of that are comments, the rest
isn't very big at all)



--
Arjan van de Ven Intel Open Source Technology Centre
For development, discussion and tips for power savings,
visit http://www.lesswatts.org


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