RE: cpufreqd: ondemand

["Florian Dorpmueller" <dorpmueller@hotmail.com>]

> Hello,
>
> I have an /etc/cpufreqd.conf that makes
> /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq go to 600000
> on Mandriva if the system is idle.
> However the same configuration on Debian makes it go to 1500000 that
> is full speed if the system is idle.
> Kernel is 2.6.8-2-686.
> Why does the same cpufreqd configuration behave differently on
> Debian than on Mandriva?
> What is required on Debian to make it go to the minimum frequency if
> the system is idle?
>
> The config file looks like:
>
> ....
> # this is a comment
> #
> # you need: 1 [General] section,
> #           1 or more [Profile] sections
> #	          1 or more [Rule] sections
> #
> # a section ends at the first blank line
> #
> # [Rule] sample:
> #           [Rule]
> #           name=sample_rule
> #           ac=on                    # (on/off)
> #           battery_interval=0-10
> #           cpu_interval=30-60
> #           programs=xine,mplayer
> #           profile=sample_profile
> #
> # [Profile] sample:
> #           [Profile]
> #           name=sample_profile
> #           minfreq=10%
> #           maxfreq=100%
> #           policy=performance
> #
> # see CPUFREQD.CONF(5) manpage for a complete reference
>
> [General]
> pidfile=/var/run/cpufreqd.pid
> poll_interval=2
> pm_type=acpi #(acpi, apm or pmu)
> # Uncomment the following line to enable ACPI workaround (see 
> cpufreqd.conf(5))
> # acpi_workaround=1
> verbosity=4 #(if you want a minimal logging set to 5)
>
> [Profile]
> name=old_hi_boost
> minfreq=66%
> maxfreq=100%
> policy=performance
>
> [Profile]
> name=hi_boost
> minfreq=0%
> maxfreq=100%
> policy=ondemand
>
> [Profile]
> name=medium_boost
> minfreq=33%
> maxfreq=66%
> policy=performance
>
> [Profile]
> name=lo_boost
> minfreq=0%
> maxfreq=33%
> policy=performance
>
> [Profile]
> name=lo_power
> minfreq=0%
> maxfreq=33%
> policy=powersave
>
> # conservative mode when not AC
> [Rule]
> name=conservative
> ac=off                   # (on/off)
> battery_interval=0-100
> cpu_interval=0-40
> cpu_nice_scale=1.5
> delay_cycles=3
> profile=lo_boost
>
> # need some power
> [Rule]
> name=lo_cpu_boost
> ac=off                   # (on/off)
> battery_interval=0-100
> cpu_interval=30-80
> profile=medium_boost
>
> # need big power (not if battery very low)
> [Rule]
> name=hi_cpu_boost
> ac=off                   # (on/off)
> battery_interval=50-100
> cpu_interval=70-100
> profile=medium_boost
>
> # full power when AC
> [Rule]
> name=AC_on
> ac=on                   # (on/off)
> profile=hi_boost
>
> # full power when watching DVDs and not AC:
> # this is the last rule and takes less
> # precedence with respect to the others
> [Rule]
> name=dvd_watching
> ac=off                   # (on/off)
> battery_interval=0-100
> programs=xine,mplayer,avidemux
> cpu_interval=0-100
> profile=hi_boost
> ....

If you are able to understand german, I can recommend to have a look at 
http://www.debianforum.de/wiki/?page=P4DynamischTakten. Furthermore I 
propose to use the ondemand governor.

Florian