Stange, on my working system (8.04.2, Pentium M 2GHz) the
sampling_rate_min is 10000 and setting sampling_rate to this value is
possible. Did you try the 2 commands "sudo su; echo ..." or only "sudo
echo ..."? The first one works here.
As I understand it: lowering the sampling_rate makes the measuring of
CPU load "more instant". 40000 makes a CPU load of 70% mean: during the
last 40000 ms the CPU was used 70% of the time. So if a flash video
decoder encounters more complex frames then the system will detect this
only 40000 ms later.
You could try it with a Live-CD of Jaunty final, without changing
anything in /sys. If it is still reproducible on your machine then there
is a (serious) problem and you should report it here and add what CPU
you have:
$ sudo lshw -C processor
Also try disabling any Desktop effects ("Compiz"). Video drivers seem
under heavy development since Jaunty.
--
CPU Scaling too aggressive
https://bugs.launchpad.net/bugs/107545
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