Ben Branch wrote:
> Thanks -- I find this discussion enlightening. FWIW, when I boot my
> BIOS says "C1E BIOS Supported". If I follow the discussion, this means
> that I may be getting C-state transitions but they are invisible to the
> Linux kernel.

... not on your Intel CPU.

> 
> I'm trying to track down disk activity right now. I've implemented several
> of the Tips, including the hdparm to spin-down, but my desktop seems to
> generate too much disk activity to either spin-down or to spin-down long
> enough to be meaningful. A never-ending quest!

you know about blktrace right? (if not.. it's a killer tool for this sort of 
thing)

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