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cpu speed measurement


I have a Sony Vaio F212K. My BIOS has an option to reduce CPU speed if
the computer is idle. I want to try the option to see if it works with
linux and to save some battery power. Does anyone know a programm to
measure the cpu speed or even better the clockrate? The KDE control
center shows the CPU speed but it always showed me a rate of 172 MHz
(the computer has a 650 MHz CPU) when I turned the reduce CPU speed
option in the Bios on. But I am not really sure if it really measures
the CPU speed dynamically because I tryed to watch some divx movies
and play quake2 and it actually worked and I dont think 172 MHz are
enough for that:-) Any tips are really appretiated.


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