Messages in this thread |  | | | Date | Wed, 4 Jan 2006 17:50:10 -0800 | | From | Tony Lindgren <> | | Subject | Re: 2.6.15-ck1 |
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* 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.
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