On Fri, 2013-07-19 at 15:44 +0200, Thierry Chatelet wrote:
> Now what will cpufrequtils do?

CPU frequency scaling. If your computer rests and the CPU governor is
set to "performance", than the CPU anyway will be used at maximal clock.
If it's set to another governor e.g. "ondemand", than the CPU will run
full throttle if needed, but with lower Hz when not needed. It's als
possible to use the CPU at a fixed rate, e.g. a 2 GHz CPU could
permanently set to run at 1 GHz.



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