Re: CX > 1 support for Athlon SMP systems

[Carl Thompson <cet-GxmFRYwVNOxKOnpN5g9PlQ@public.gmane.org>]

Quoting Johnathan Hicks <thetech-Pn2JTpibVOrk1uMJSBkQmQ@public.gmane.org>: 
 
> Carl Thompson wrote: 
> > Wow.  This actually seems to work on my Sony laptops.  But I 
> > wonder if it is really puting the CPU in C2 because there is no 
> > additional power savings or temperature reduction than using ACPI.  
> > Is there any way to test if CPU is going in C2 state?  
>  
> I can't think of anything at the hardware level, but you do a printk 
> or something inside the while loop that contains the inb() in the 
> idle loop. 
 
What I mean is I know the loop is executing, but how do I know the 
processor is _really_ in C2?  I was expecting a significant change in 
batterly life and CPU temp vs. the C1 state that ACPI put my CPU in.  
I haven't run definitive tests, but at best I'm only at most 15-20 
minutes more battery life (if any at all). 
 
> ... 
 
> --John 
 
Carl Thompson 
 


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