On Wed, 2010-06-02 at 23:06 +0800, Matthew Garrett wrote:
> On Wed, Jun 02, 2010 at 11:04:09AM +0800, yakui.zhao@xxxxxxxxx wrote:
> > From: Zhao Yakui <yakui.zhao@xxxxxxxxx>
> >
> > The C-state idle time is not calculated correctly, which will return the wrong
> > residency time in C-state. It will have the following effects:
> > 1. The system can't choose the deeper C-state when it is idle next time.
> > Of course the system power is increased. E.g. On one server machine about 40W
> > idle power is increased.
> > 2. The powertop shows that it will stay in C0 running state about 95% time
> > although the system is idle at most time.
>
> What kind of system was this seen on?
This can be seen on laptops. But maybe the idle power effect is not
significant on laptops like that on server machine.
I also test the power on one T400 laptop and test shows that about
0.3W idle power is increased.
thanks.
Yakui
>
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