cat /proc/acpi/processor/CPU0/power

cat /proc/acpi/processor/CPU0/power

[Nate Grey]

Hi guys, I'd like to what this mean, and if I can use it to do something on 
the processor. 
Thank you. Bye

($:~)=> cat /proc/acpi/processor/CPU0/power
active state:            C2
default state:           C1
bus master activity:     00000000
states:
    C1:                  promotion[C2] demotion[--] latency[000] 
usage[00095790]
   *C2:                  promotion[--] demotion[C1] latency[099] 
usage[00801998]
    C3:                  <not supported>


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Re: cat /proc/acpi/processor/CPU0/power

[Dino Klein]

this is for informational purposes; if you want to know about C-states, then check section 8 in the ACPI specs.
The bus master activity value will change to non-zero values when there is BM activity in the system. BM activity affects the use of C3, which  your chipset doesn't support.

> -----Original Message-----
> From: Nate Grey [mailto:nate-XtQPfPCVGG7srOwW+9ziJQ@public.gmane.org]
> Sent: Sunday, April 25, 2004 10:36 AM
> To: acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
> Subject: [ACPI] cat /proc/acpi/processor/CPU0/power
> 
> Hi guys, I'd like to what this mean, and if I can use it to do something on 
> the processor. 
> Thank you. Bye
> 
> ($:~)=> cat /proc/acpi/processor/CPU0/power
> active state:            C2
> default state:           C1
> bus master activity:     00000000
> states:
>     C1:                  promotion[C2] demotion[--] latency[000] 
> usage[00095790]
>    *C2:                  promotion[--] demotion[C1] latency[099] 
> usage[00801998]
>     C3:                  <not supported>
> 
> 
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Re: cat /proc/acpi/processor/CPU0/power

[Dominik Brodowski]

On Sun, Apr 25, 2004 at 10:36:14AM +0000, Nate Grey wrote:
> Hi guys, I'd like to what this mean, and if I can use it to do something on 
> the processor. 

http://acpi.sourceforge.net/documentation/processor.html

check for the section "power". Linux does this automatically for you
already.

	Dominik


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