[Grml] Re: Controlling CPU Frequency

[Michael Prokop]

* - Tong - <mlist4suntong at yahoo.com> [20070801 06:15]:
> On Tue, 31 Jul 2007 08:47:32 +0200, Michael Prokop wrote:

> > To check your current settings regarding cpu frequency scaling check
> > output of 'cpufreq-info'...

>  % cpufreq-info
>  cpufrequtils 002: cpufreq-info (C) Dominik Brodowski 2004-2006
>  Report errors and bugs to linux at brodo.de, please.
>  analyzing CPU 0:
>    no or unknown cpufreq driver is active on this CPU

Ok, so you don't have any drivers loaded.

> ,-----
> | If cpufreq quits with an error message, you should first re-check that you
> | have the correct cpufreq driver.
> `-----

> So, what cpufreq driver should I use?

See below.

> > Is the 'thermal' kernel module loaded on your system?

>  % insmod thermal
>  insmod: can't read 'thermal': No such file or directory

# modprobe thermal

>  $ dmesg | grep ^CPU0
>  CPU0: AMD Athlon(tm) 64 Processor 2800+ stepping 0a

> ,-----
> | If you intend to use a kernel compiled with these features, you should use
> | dmesg | grep cpufreq to check if the kernel was able to initialize the
> | feature.
> `-----

>  % dmesg | grep cpufreq || echo no found
>  no found

Sure, because no appropriate driver is loaded.

>  $ uname -rm
>  2.6.20-grml i686

> > Check CPU
> > temperature using tools like sensors/mbmon (depending of your
> > hardware whether what's supported of course).

> How would I know if my hardware is supported or not?

What does:

source /usr/bin/cpufreq-detect.sh
echo $MODULE

report on your system? Try to load the $MODULE via 'modprobe
$MODULE' then, does cpufreq-info report anything then?

> BTW, anybody know the 'conservative' governor?

Yes. ;) But I usually prefer the ondemand governor.
Check /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
for current settings as soon as cpufreq is working.

regards,
-mika-
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