Re: acpi_processor.c - kernel 2.6.1

[christian graf <chr.graf-Mmb7MZpHnFY@public.gmane.org>]

Hu Yuri, hi Yu

I have enabled all 3 governors:

cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors
powersave performance userspace


Actual after logging in I run the command:
TARGET=/sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed
F_LOW=powersave
echo $F_LOW > $TARGET

But it does not really matter to which governor I'm switching, my CPU
stays in C2 independant from load and used governor. My notebook in a
Siemens Lifebook E4010D, newest Bios.


But I thought setting a governor is totally independant from setting the
cpu_freq, using speedstep-technology?


Any other ideas for me?

Thanks

christian


Am So, den 18.01.2004 schrieb Yury V. Umanets um 12:18:
> On Sun, 2004-01-18 at 02:43, christian graf wrote:
> > Hi,
> Hello,
> > 
> > reading the /usr/src/linux-2.6.1/drivers/acpi/processor.c
> > i thought the kernel should set the state dynamically, based on the
> > load. Maybe it is possible to set the processor-state of my centrino
> > manually. Can please anybody tell me how to get it right?
> > 
> 
> There is an user-space daemon, which adjusts CPU speed basing on current
> loading. And it is able to change CPU frequency if userspace cpufreq
> governor is turned on. I would like to see this functionality in kernel
> though.
> 
> > The reason I'm asking is, that once I do load the processor.ko module,
> > my Centrino switches immediately into C2-state. It never switches back
> > to C1 state, even under heavy load like compiling the kernel.
> > 
> I guess, that there is no code in kernel, which does watch current
> loading and adjust CPU speed. Also this is job for a cpufreq governor,
> not for CPU driver. 
> 
> For now, there are three governors:
> (1) powersave -- setting CPU frequency statically to lowest available
> frequency.
> (2) performance -- setting to highest available frequency.
> (3) userspace -- used for setting CPU frequency manually.
> 
> Probably there also should be number (4), which will set it basing on
> current loading.
> > I think the kernel should switch back from C2 to C1 state from alone????
> > 
> > Please ask me whatever you need to help me swtiching back into C1 state.
> > 
> > christian



-------------------------------------------------------
The SF.Net email is sponsored by EclipseCon 2004
Premiere Conference on Open Tools Development and Integration
See the breadth of Eclipse activity. February 3-5 in Anaheim, CA.
http://www.eclipsecon.org/osdn