Message-ID: <474236A0.8030601@zytor.com>
Date: Mon, 19 Nov 2007 17:21:36 -0800
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Dave Jones <davej@redhat.com>, Stephen Clark <Stephen.Clark@seclark.us>,
       linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: Power Saving
References: <47422D3B.8080704@seclark.us> <20071120005443.GB9243@redhat.com> <474232D9.20407@seclark.us> <20071120011236.GA17420@redhat.com>
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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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