Re: comments on irc log

[Benjamin Herrenschmidt <benh-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>]

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On Fri, 2005-03-18 at 19:13 +0100, Pavel Machek wrote:

> 
> So it is basically "need very simple piece of documentation from
> notebook vendor" and some vendors are already wiling to share that
> info? Good.

Yes. At this point, I can wake up rv350 and rv280 mobilities with some
limitations (maybe not all panels, I don't get the DVI output right
yet, ...). The "piece of doc" might even be obtained from ATI there
since it's possible that this infos is in a standard place in the BIOS
image (like other tables already there).

> > 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

Yes, it was also on some ppc's which is why I'm wondering if I did
something wrong in my experiment :) It may also be different for
different CPU models.

Ben



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