Re: Userspace: available processorspeeds

[Ducrot Bruno <ducrot@poupinou.org>]

On Mon, Oct 06, 2003 at 11:19:25AM +0200, Jeroen Van der Vegt wrote:
> Hello,
> 
> I'm trying to write a userspace processor-speed governor for my laptop, 
> an Asus L3000D. It has an AMD Athlon Mobile processor and runs on Linux 
> 2.6.0-test5 (and Debian unstable).
> 
> For some reason, my laptop crashes when the speed changes from maximum 
> to minimum at once. So my program is to step the speed only to the next 
> level available. This is repeated every 5 seconds, so both the maximum 
> and minimum speed are reachable.

Please be sure to upgrade to linux-2.6.0-test6 at least, due to some bugs
in previous versions in powernow-k7.

> The available speeds are printed when the module PowerNow is loaded, but 
> isn't there a 'better' way to retrieve this information? There doesn't 
> seem to be a file listing all possible speeds in either /proc nor /sys. 
> Have I overlooked a file perhaps, or is there some function call I can use?
> 
> Besides this, I have experienced the following weirdness: according to 
> /sys/.../scaling_min_freq, my processor's minimum speed is 532 Mhz. I 
> have, however, had it running at 292Mhz (as reported by /proc/cpuinfo). 

Strange.  Perhaps a bug somewhere in core?

> It's not really reproducible unfortunately, and I only noticed it once 
> or twice.The laptops keeps working fine though, so it's not much of a 
> problem to that respect. Any actions I should take the next time I see it?

Look what say bogomips, or x86info --mhz

Cheers,

-- 
Ducrot Bruno

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