Messages in this thread | | | Date | Tue, 27 Nov 2007 17:31:37 -0500 | From | Phillip Susi <> | Subject | Re: Power Saving |
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H. Peter Anvin wrote: > 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.
Well, they FORCE the use of the C states to save power, even if the kernel doesn't want to because it still has runnable tasks. This can be useful if you know you are running a task that busy waits but would not suffer from having the performance of the cpu cut in half. Since it is busy waiting, the kernel never activates the C states, but the throttling will force it and thus, save you power and heat.
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