Re: IBM R50e and CPU-frequeny

On Fri, Nov 09, 2007 at 01:27:54PM +0100, Rainer Krienke wrote:
> Hello,
> 
> I have an IBM R50 E with a Intel Celeron 1.4 Ghz processor installed with 
> 10.3. Recently I discovered that simply loading the module p4_clockmod scales 
> down the CPU-frequency to about 170MHZ and as needed scales the freq up.  
> This helps saving battery power.

No it doesn't. Celerons don't have CPU frequency scaling. p4_clockmod only
has duty cycle modulation (the same as throttling) which does not save
any power.

> What I would like to do is to set a lower limit beacuse sometimes the 
> interaction feels quite slow because of the very low initial frequency. So 
> what I would like to to is to say: 
> 
> Use eg 500MHZ as a lower limt for downscaling the CPU and scale up as needed. 
> 
> On my P4 Desktop I once had such an option where I could say eg:
> 
> echo "500" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq
> 
> to get this done but in 10.3 there is no such proc entry. Any other way to get 
> this done?

Apart from this being a pretty pointless exercise, which files do you have under
/sys/devices/system/cpu? "find /sys/devices/system/cpu" will do.
-- 
Stefan Seyfried
QA / R&D Team Mobile Devices        |              "Any ideas, John?"
SUSE LINUX Products GmbH, Nürnberg  | "Well, surrounding them's out." 

This footer brought to you by insane German lawmakers:
SUSE Linux Products GmbH, GF: Markus Rex, HRB 16746 (AG Nürnberg)