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Old 01-14-2007, 07:39 AM   #1
preeth26
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Registered: Jan 2006
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Unhappy CPU Frequency Scaling in Arch Linux


Dear friends
I need some help with CPU frequency scaling in Arch Linux. I have installed Arch Linux on my HP Pavilion 64 bit laptop by carefully following their wiki and I am quite happy with it. I also triple boot with Ubuntu Feisty and Suse 10.2. I noticed recently that the applet for CPU Frequency Scaling applet in the arch linux installation (I am using Gnome) frequently fluctuates from the minimum to maximum. (800MHZ-2200MHZ) I am using 'ON DEMAND' as my CPU frequency scaling governor and I have taken care to follow their wiki correctly. I have checked this more than once.

In my Ubuntu and Suse installations where CPU frequency scaling is already set up, the frequency does not seem to fluctuate as often for normal, everyday tasks. It is more steady at 800 MHZ. Once again, I am using 'ON DEMAND' The Arch Linux install does not seem to be overheating my CPU from what I can tell in spite of fluctuating often in its frequency. I am not sure what is happening, why it fluctuates more often than the other installations. When I point my cursor to the applet, it sometimes says 'ON DEMAND' which is the governor that I am using but when it goes towards to the higher frequencies it indicates that I am using other governors such as 'PERFORMANCE'.

Is this problem something to do with the applet itself, that it is not correctly reflecting the settings that I set up using the command line? Or is it something that can eventually affect the performance of the CPU and the laptop itself?

Thanks to anybody who can offer some suggestions!
Regards
preeth26.
 
Old 01-15-2007, 05:18 AM   #2
Zmyrgel
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IIRC the ondemand governor increases the frequency to maximum when the load increases and after task is completed reduces the frequency to minimum.
If you want to increase it slowly step by step you should use the conservative governor.
 
Old 01-17-2007, 05:55 PM   #3
preeth26
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Registered: Jan 2006
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CPU Frequency Scaling in Arch Linux

Hi there
Thanks for your response. I do understand that part. However, my question is whether it is possible that the settings for CPU Frequency Scaling in Arch Linux, in my installation are somehow arbitrarily going to performance mode even in everyday tasks? I have adjusted the settings using the command line to reflect Powersave, On Demand and conservative. It does not seem to make much difference. It does sit on 800 MHZ at first but then seems to easily reach 2200 MHZ even in everyday tasks, unlike my Ubuntu and Suse installations which do not fluctuate from the base frequency of 800 MHZ during everyday tasks.

Thanks again for any suggestion that you may offer.
Regards
preeth26
 
  


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