[mythtv-users] Cool'n'Quiet setup help
finlay at moeraki.com
Mon Feb 9 01:03:51 UTC 2009
Allen Edwards wrote:
> I have an AMD 5400+ running Mythbuntu 8.10. I would like to run
> cool'n'quiet to cut the cpu temp and power. I enabled it in the BIOS
> and the results were unsatisfactory. The program would stutter. I
> could see that the cpu was running at 1GHz during program mode and
> that wasn't enough.
> What I want to do is have the CPU at a low clock frequency but when
> there is basically any activity at all, have it go to 100% clock. For
> example, right now the CPU is at .6%. It would be nice if the clock
> was at a minimum. But if the cpu goes above, say 2%?, I want the CPU
> to go to max clock so it wont stutter.
> I see instructions on the net how to do this but they are 3 years old
> and experience has thought me that following instructions like this
> causes a half day work getting the system working again because the
> instructions were for an older system.
> So, can anyone with a system like mine who has enabled cool'n'quiet
> and understands what I am saying help me out?
This uses the cpufreq module which uses the threshold (% cpu) in:
As root you can change this e.g.:
echo -n 10 > /sys/devices/system/cpu/cpu0/cpufreq/ondemand/up_threshold
Other params in /sys/devices/system/cpu/cpu0/cpufreq can be changed as well:
If using Ubuntu you can set params on boot in the /etc/init.d/powernowd
file. Add in the use_ondemand() function something like:
if [ -f $x"cpufreq/ondemand/up_threshold" ]; then
echo -n 20 > $x"cpufreq/ondemand/up_threshold"
If using Fedora the /etc/sysconfig/cpuspeed file allows you to tweak things.
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