Messages in this thread | | | Date | Sun, 13 Jul 2008 08:35:59 -0700 | From | Arjan van de Ven <> | Subject | Re: v2.6.26-rc7: Negative powertop values |
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Pavel Machek wrote: > On Tue 2008-07-08 06:52:51, Arjan van de Ven wrote: >> On Sun, 6 Jul 2008 21:48:45 +0200 >> Pavel Machek <pavel@suse.cz> wrote: >> >>>> [I assume you know that doing a software unplug you burn more power >>>> than by leaving the cpu idle] >>> We should really fix that one day... >> yeah but it's incredibly hard to get right (in the light of the bios >> constantly changing what our allowed C-states are)... and the best case > > What can happen there? So BIOS decides C4 may no longer be cool idea > because we have AC power now, but that does not mean C4 stops working, > right?
or it decides that your voltage regulator needs to operate in a certain mode and the voltage for C4 is no longer available. or .. or ...
> > How is changing allowed C-states list supposed to work, anyway? I > mean, we may be in one of those on other CPU when BIOS decides to > change the list...
you get an interrupt to notify you of the change ;-)
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