cpufreq and changing driver

Bruno Ducrot ducrot at poupinou.org
Wed Nov 30 13:32:37 GMT 2005

On Wed, Nov 30, 2005 at 12:37:43PM +0100, Marco Calviani wrote:
> Hi,
>   having seen on the cpufreq(4) man page that there is more than one
> driver that is currently supported. In particular having a centrino
> processor, i would like to use the est driver. Currently, by default,
> the running driver is the one that comes with acpi (AFAIU), and i'm
> using powerd to control the cpu frequency in adaptive mode.

You have to load the cpufreq.ko module at boot.
Adding that line:
cpufreq_load = "YES"
to /boot/loader.conf
should be OK.

> In particular doing comparison with the linux case in which i have
> cpufreq with speedstep-centrino driver and the ondemand governor, in
> this case the system is much more responsive and also the fans runs
> much more quieter (although i cannot rely on proven data since i don't
> know any benchmark program). In particular i understood that the
> ondemand governor responds to the system much faster that powerd is
> able to do.
> Is there someone who can share some impression or thoughts?

powerd need some rework in order to get it working properly.  There
is one FreeBSD project on that subject if you are interrested.

Bruno Ducrot

--  Which is worse:  ignorance or apathy?
--  Don't know.  Don't care.

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