Re: comments on irc log

[Pavel Machek <pavel-AlSwsSmVLrQ@public.gmane.org>]

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Hi!

> > > 21:52:11< pavelm> I was playing with variable scheduling ticks here,
> > > hoping to save some power. 21:52:31< pavelm> How big power savings
> > > should I expect? 21:52:48< pavelm> What cpu will benefit most?
> > > 21:53:04< pavelm> Is there easy way to measure it?
> > > 
> > > I played with that too on some PPCs and was surprised by the absence
> > > of benefit, but I might have done something wrong, I need to
> > > instrument the stuff better.
> > 
> > Difference between HZ=100 and HZ=1000 was measuerd to be approx. as
> > big as disk spinnned up vs. spinned down (i.e. watt or so) by
> > seife.... Not *that* unimportant. But it took month or so to get that
> > data, because he was basically measuring runtime from full to empty
> > battery.
> 
> Have any of these patches been published?  I've been playing with
> variable ticks too, and I would like to see what other people have been
> doing (as so far, the only thing I've managed to do is commit crimes
> against nature and the idle loop).

Try searching lkml archives for CONFIG_NO_IDLE_HZ.... There are
actually two different codebases floating around.
								Pavel
-- 
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