Re: We suck in power management ...

[Thomas Donnelly <TDonnelly@xxxxxxxxxxx>]

Thomas Donnelly wrote:
> Hasso Tepper wrote:
> > Matthew Dillon wrote:
> >  
> > >     est is far prefered over the ACPI idle hook.  The ACPI hook is a
> > > disaster and frankly shouldn't be used.
> > >     
> >
> > Well ... I have here hacked together est module for core 2 CPU's 
> > (mainly work done by Michal Belczyk [1]) and the result is that 
> > although changing voltage has effect, changing frequency doesn't have 
> > any effect to power usage or heat. CPU is just slower. I havent 
> > digged deep into it yet, though ...
> > [1] - 
> > http://leaf.dragonflybsd.org/mailarchive/bugs/2007-04/msg00099.html
> >
> >
> >   
> Just thought I would chime in here. Most people already know this, 
> but, the reason that the lower frequency is brought into play is that 
> the decreased voltage isn't stable at that frequency. A lower 
> frequency allows a lower voltage.
>
> -=Tom