cpufreq module on x86_64

[Callum Lerwick]

On Fri, 2008-12-05 at 14:46 -0600, Matthew Woehlke wrote:
> Jerry James wrote:
> > First I wondered why I was getting a cpufreq module loaded on a
> > desktop machine.
> 
> ...so your machine draws less power when you aren't using it?
> 
> I hear that there is a general trend to add power-friendliness to 
> Fedora, mainly for laptops/netbooks, which is probably the "why". 
> However, I agree with doing it in general since saving power is good on 
> desktops also :-).

Also note that power usage directly manifests in heat output. The amount
of heat spewed into the room by a high performance desktop system is
very much a concern on a hot humid summer day in a trailer house with no
air conditioning, sitting in your underwear with sweat dripping down
your face just trying to catch up on fedora-devel...

However it may be desirable in the winter. :)

It also can manifest in noise. Hard drives spinning, fans... Noise noise
noise. If you've got temp regulated fans, less heat means less noise...

I noticed that at some point my Athlon 64 3000+ (2ghz) desktop system
lost its ability to change frequency. I think it happened in a F9
update, but its definately gone in F10. It was capable of switching
between 2ghz and 1ghz. Is mine one of the old Athlon 64's that take too
much time to switch or something? I never had too much problem, if I was
doing something really demanding I'd just manually lock it at 2ghz...
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