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SubjectRe: 2.6.15-ck1
* Arjan van de Ven <arjan@infradead.org> [060104 12:34]:
> On Wed, 2006-01-04 at 14:57 -0500, Dave Jones wrote:
> > On Wed, Jan 04, 2006 at 02:05:54PM -0500, Dave Jones wrote:
> > > On Wed, Jan 04, 2006 at 12:00:00PM +1100, Con Kolivas wrote:
> > > > +2.6.15-dynticks-060101.patch
> > > > +dynticks-disable_smp_config.patch
> > > > Latest version of the dynticks patch. This is proving stable and effective on
> > > > virtually all uniprocessor machines and will benefit systems that desire
> > > > power savings. SMP kernels (even on UP machines) still misbehave so this
> > > > config option is not available by default for this stable kernel.
> > >
> > > I've been curious for some time if this would actually show any measurable
> > > power savings. So I hooked up my laptop to a gizmo[1] that shows how much
> > > power is being sucked.
> > >
> > > both before, and after, it shows my laptop when idle is pulling 21W.
> > > So either the savings here are <1W (My device can't measure more accurately
> > > than a single watt), or this isn't actually buying us anything at all, or
> > > something needs tuning.
> >
> > Ah interesting. It needs to be totally idle for a period of time before
> > anything starts to happen at all. After about a minute of doing nothing,
> > it started to fluctuate once a second 20,21,19,20,19,20,18,21,19,20,22 etc..
>
>
> sounds like we need some sort of profiler or benchmarker or at least a
> tool that helps finding out which timers are regularly firing, with the
> aim at either grouping them or trying to reduce their disturbance in
> some form.

Take a look at timertop for that.

Tony
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