linux-kernel - Re: Power Saving

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Date:	Mon, 19 Nov 2007 17:21:36 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Dave Jones <davej@...hat.com>,
	Stephen Clark <Stephen.Clark@...lark.us>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Power Saving

Dave Jones wrote:
>  > 
>  > and:
>  > cat /proc/acpi/processor/CPU0/throttling
>  > state count:             2
>  > active state:            T0
>  > states:
>  >    *T0:                  00%
>  >     T1:                  50%
> 
> See above. These are throttling states, used typically
> if the system is overheating.
> 

And more importantly, there is no power advantages over T states as 
opposed to C states.  They pretty much mean pulsing the system in and 
out of either C1 or C2 depending on the CPU/chipset.

	-hpa
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