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Thread: cpufreq puts CPU in lowest mode under heavy load

  1. #1
    Join Date
    Jan 2008
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    148

    cpufreq puts CPU in lowest mode under heavy load

    I have a Dell Inspirion 1501 with a 2 ghz AMD processor. It supports CPU frequency scaling. However, when the machine is performing cpu-intensive functions (compiling kernel, etc.), when the governor is set for "performance," the speed scales down to the lowest speed, 800 mhz (40%). Once the compiling is complete, it goes back to the full 2 ghz.

    This is extremely annoying and counter-productive. It did this with the 2.6.22-9 kernel in Gutsy and it's still going it with the 2.6.24-16 now that I've upgraded to Hardy. Is there any way to fix this behavior?

    Thanks!

  2. #2
    Join Date
    Jan 2006
    Beans
    Hidden!

    Re: cpufreq puts CPU in lowest mode under heavy load

    I'm trying to find out why powernowd doesn't seem to do anything on my box with Hardy, so I uninstalled it, and installed CPUDYN instead. Scaling now works, although I'd like to find out why powernowd doesn't work.

    Maybe try cpudyn instead of powernowd for a temporary fix....
    20" G5 iMac - AMD64 HP desktop
    http://www.ppclinux.info/

  3. #3
    Join Date
    Jan 2008
    Beans
    148

    Re: cpufreq puts CPU in lowest mode under heavy load

    I still need to figure out what's going on here. I tried ripping a DVD with HandBrake (awesome app) the other day and the processor slowed down to 800 mhz for the entire process. Something isn't right here!

  4. #4
    Join Date
    Aug 2005
    Location
    Fargo, ND, USA
    Beans
    1,499
    Distro
    Kubuntu 10.04 Lucid Lynx

    Re: cpufreq puts CPU in lowest mode under heavy load

    It's the new CPU scheduler in the kernel. They (Ubuntu) misconfigured it. A better kernel will get pushed out as an update soon. You can get the new kernel immediately if you add hardy-proposed to your /etc/apt/sources.list and install the latest kernel.

    Quote Originally Posted by /etc/apt/sources.list
    deb http://mirror.cs.umn.edu/ubuntu/ hardy-proposed main restricted
    deb-src http://mirror.cs.umn.edu/ubuntu/ hardy-proposed main restricted
    (use your own favorite mirror or archive.ubuntu.com)

    Code:
    sudo aptitude update && sudo aptitude upgrade && sudo aptitude install linux-generic
    You can also tweak the values in /sys/kernel/uid/$UID/cpu_share to get more CPU time for your user.
    Help yourself: Search the community docs or try other resources.
    Quote Originally Posted by Henry Spencer
    Those who do not understand Unix are condemned to reinvent it, poorly.
    Let science use your computer when you aren't: Folding@Home.

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