Michael Jarosch wrote: > Hello, everybody! > > I followed the discussion about pro and cons about speed-stepping on a > multimedia machine on this list. I'm feeling very uncomfortable sitting > in front of an idling computer burning 150Watts of power in the era of > global warming when it is so easy to cut the consumption to the half of > it - and even more on multicore-machines. I found a solution for me to > save energy AND to avoid xruns which may be an option for other people > or maybe even an option for a default 64studio-installation. > > Gnome includes an applet to easily set the cpu-frequency in userspace,
For KDE there is an application, I'm using it with Suse, but with 64 Studio this application force to use full CPU speed. It's KPowersave. > called "frequency scaling monitor". I've got an AMD Athlon64 3000+, so > the kernel module "powernow-k8" must be loaded. Two cpufreq-governors > seem to be loaded by default without loading another kernel module. > These two are "ondemand" and "performance". To use the applet it is > useful to activate another scaling-governor, namely "userspace", which > can be done with loading the "cpufreq_userspace" module. To have it > loaded at boottime I had to write the names of the modules "powernow-k8" > and "cpufreq_userspace" to /etc/modules. The last thing to do is to set > the SUID-bit to the applet. This can be done through "dpkg-reconfigure > gnome-applets". > > Now, it's very easy to switch between CPU-frequencies or even > scaling-governors. When I'm working with GIMP or another > non-realtime-application, I use "ondemand" and the machine pulls down > the frequency if the cpu runs idle. The same with KPowersave. For Suse I run the CPU with less speed by default and if I would make music, I would change this just by one click to a performance profile, that runs with full speed. (My mobo isn't fine for audio productions with Linux, but if I've got a mobo that's fine with it, I would use KPowersave that way.) > When I'm doing some sound with jack, > I start working with the lowest frequency and switch to a faster one if > the cpu-power is getting too limited. If I use f.e. a synthy for myself > I can live with some xruns. For recording or on liveshows, I'm using > "performance" by default, which means that the system is stuck to the > highest frequency and I won't get an xrun because of the cpu switching > from low to high. > > Hope, this was useful for someone! > Greetings! > > Mitsch > Full Ack :). It would be good if hdparm or another command would be able to stop hard disk drives that are only in use for backups and never will be used while doing a production, but hdparm don't work for any of my Linux. Cheers, Ralf
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