cpufrequtils for x86_64

[Duncan_Idaho]

hi salix team
I'd like to have cpufrequtils available in the x86_64 repo because my desktop's processor is running at full throttle all the time and it's kinda noisy
thanks in advance

[thenktor]

Just use something like this:

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# powernow
/sbin/modprobe cpufreq_ondemand
/sbin/modprobe powernow-k8
echo ondemand > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
echo 40 > /sys/devices/system/cpu/cpu0/cpufreq/ondemand/up_threshold

[Duncan_Idaho]

thanks thenkor
but I have a doubt, do I have to do that every time the machine boot?
in that case, adding them to /etc/rc.d/rc.local is ok?

[thenktor]

Yes add it to rc.local

[Duncan_Idaho]

done, thank you

[gapan]

Hmm... strange. Scaling works fine for me out of the box, no tweaking at all required. I'm not saying it's strange that it doesn't work for you, I'm saying it's strange that it works for me.
It didn't use to.

[Shador]

Default governor is afaik:

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CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE=y

So it's indeed weird that it works for you out of the box.
Maybe it's the xfce-power-manager? (BTW did you find any lightweight alternative for it?)

I recently read that the conservative governor was better suited for energy-critical applications like laptops, because it slowly rises clock, whereas ondemand jumps to the highest possible immediatly, which makes it more suited for desktops.

[thenktor]

Hmm... strange. Scaling works fine for me out of the box, no tweaking at all required. I'm not saying it's strange that it doesn't work for you, I'm saying it's strange that it works for me.
It didn't use to.

For sure it works without any tweaking on my notebook, but I've never really tested on my desktop PC. Perhaps the kernel makes some difference between CPUs?

[Shador]

Hmm... strange. Scaling works fine for me out of the box, no tweaking at all required. I'm not saying it's strange that it doesn't work for you, I'm saying it's strange that it works for me.
It didn't use to.

For sure it works without any tweaking on my notebook, but I've never really tested on my desktop PC. Perhaps the kernel makes some difference between CPUs?

It didn't on my laptop, I still assume you're running some program like xfce-power-manager, which changes the governor.
I don't think the kernel devs would want to make any such assumptions, especially as there's the default governor config options, which is set to userspace on salix/slackware:

Code:
CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE=y

Try yourself:

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grep -i default_gov /boot/config

[gapan]

No, I'm not running xfce-power-manager or anything like it (I haven't found anything like it anyway). I'm usually running e16 and the governor that is used by default here is the ondemand one.

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$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
ondemand

and I can also see it's the one loaded by default in /etc/rc.d/rc.modules:

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  ### CPU frequency scaling policies:
  #
  # Use the CPUFreq governor 'powersave' as default.  This sets the
  # frequency statically to the lowest frequency supported by the CPU.
  #/sbin/modprobe cpufreq_powersave
  #
  # Use the CPUFreq governor 'performance' as default. This sets the
  # frequency statically to the highest frequency supported by the CPU.
  #/sbin/modprobe cpufreq_performance
  #
  # Use the CPUFreq governor 'conservative' as default.  This allows you
  # to get a full dynamic frequency capable system by simply loading your
  # cpufreq low-level hardware driver.  Be aware that not all cpufreq
  # drivers support the 'conservative' governor -- the fallback governor
  # will be the 'performance' governor.
  #/sbin/modprobe cpufreq_conservative
  #
  # Use the CPUFreq governor 'ondemand' as default.  This allows you to
  # get a full dynamic frequency capable system by simply loading your
  # cpufreq low-level hardware driver.  Be aware that not all cpufreq
  # drivers support the 'ondemand' governor -- the fallback governor will
  # be the performance governor.  This seems to be the most-recommended
  # scaling policy, so rc.modules will try to load this by default.
  /sbin/modprobe cpufreq_ondemand 2>/dev/null

### CPU scaling governor:
  #
  # Set the default scaling_governor to be used (such as userspace or ondemand)
  # if there is a CPUFreq scaling policy module loaded that supports it:
  SCALING_GOVERNOR=ondemand
  #
  # Try to enable the scaling_governor selected above:
  if [ -r /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors ]; then
    if grep -wq "$SCALING_GOVERNOR" /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors ; then
      if [ -r /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor ]; then
        for SYSCPUFILE in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor ; do
          echo "$SCALING_GOVERNOR" > $SYSCPUFILE
        done
      fi
    fi
  fi

fi # End enabling CPU scaling support

Maybe it has to do with the cpu.