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On Monday 08 March 2010 17:15:18 Martin Sandsmark wrote:
> On Monday 8. March 2010 13.39.16 Sebastian K=FCgler wrote:
> > If the ondemand governor doesn't scale up when more CPU cycles would be
> > needed, that's a kernel bug and shouldn't be papered over by UI options
> > in PowerDevil. For the downscaling, that is bogus anyway since doing the
> > work as quickly as possible and going back to sleep to save power is
> > more efficient than doing the work slower and thus keeping the CPU awake
> > longer.
>=20
> You're ignoring the fact that increasing CPU frequency also increases the
> heat  generated, and at least here it then leads to the fan firing up,
> bringing down battery time rather drastically.

Not sure how much your fan eats, but it's a rule of thumb that doing a task=
 on=20
the CPU very fast and then sleeping for as long as possible is way more eff=
icient=20
than spreading the work over a longer period of time, working a little less=
 hard.

Basically, the difference between a sleeping CPU and an active CPU is huge,=
 while=20
the difference between a fully active CPU and a throttled one is nearly lin=
ear=20
(not an order of magnitude different, in any event).

Thermal management is a valid reason, though in most cases cleaning out the=
=20
system fan will give you both, longer battery life *and* a more silent syst=
em. :)
=2D-=20
sebas

 http://www.kde.org | http://vizZzion.org |  GPG Key ID: 9119 0EF9=20

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