powernowd vs. ondemand governor

[Scott James Remnant]

On Mon, 2009-02-16 at 14:58 +0000, Matt Zimmerman wrote:

> We currently ship powernowd in the desktop seed, its main purpose being to
> load cpufreq modules set up the kernel's CPU frequency scaling governor.  If
> (and only if) that fails, it starts up powernowd instead.  I'm not sure on
> which platforms that's still needed, if any.
> 
> Is this still an appropriate default?  Aren't the necessary modules loaded
> automatically now?  Would it be a better idea to set the default to ondemand
> in the kernel and drop powernowd altogether?
> 
Some investigation has shown that the shell script that tries to pick
the right scaling _driver_ isn't even working currently.  I had to
manually modprobe acpi-cpufreq.

You can check this with:

  cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_{driver,governor}

(if you get ENOENT, you have no scaling driver loaded, try modprobe
 acpi-cpufreq)


The scaling governors are all built into the kernel, but the default is
set to performance.


I've done some kernel patches to correct this, and Tim has applied them.

Scott
-- 
Scott James Remnant
scott at canonical.com
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