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AMD Athlon 64 Cool'n'Quiet with Linux

  • Download cpudcc-2.1.tar.gz [2008Jan16] Version 2.1 update!
  • Copyright Condition: GPL General Public License Version 3

    • Linux Kernel

    Module processor and powernow-k8 are required to use AMD's Cool'n'Quiet. 
    # modprobe processor
# modprobe powernow-k8
# modprobe cpufreq_userspace
    You must check that scaling_available_governors become userspace. 
    # cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors
userspace
    File scaling_available_frequencies include an available list of CPU frequency. That values can be used as changeable CPU frequency. So, try that CPU frequency value can be changed or not. 
     $ cd /sys/devices/system/cpu/cpu0/cpufreq
 $ cat scaling_available_frequencies
 2000000 1800000 1000000
 $ su
 #  echo '1000000' > scaling_setspeed
 # cat /proc/cpuinfo

    My own program

    I know that cpudynd and powernowd are good programs to control CPU frequency. But I wrote my own program. That is a nature of code hacker. 
    # ruby cpudcc.rb --verbose
2005-07-25 12:45:10 Start:      2000000Hz
2005-07-25 12:45:10 Change:     1000000Hz
....
    An option --testmode should be used for test that changes CPU frequency as randomly per 60 seconds. 
    # ruby cpudcc.rb --testmode
    If you want to run cpudcc as well as daemon, run with nohup command. 
    # nohup ruby cpudcc.rb &
  • [2007Aug15] CPU idle time is used for CPU frequency mode.
  • [2005Oct10] --normal, --eco --powerful options are added.
    Web site

    Hironobu SUZUKI < hironobu -at- h2np -dot- net >

    $Id: index.html.en,v 1.6 2007/08/15 11:35:51 hironobu Exp hironobu $