CPU freq scaling

Ken Moffat ken at linuxfromscratch.org
Mon Oct 8 06:18:53 PDT 2007

On Sun, Oct 07, 2007 at 05:52:12PM -0700, Walter Barnes wrote:
> From: Ken Moffat <ken at linuxfromscratch.org>
> >Unfortunately, /sys seems to be forever changing - what worked 2
> >releases ago might have been renamed by now, so if it _isn't_
> >working, try using the different path to ignore_nice_load and see if
> >that helps.  ISTR that the logic was reversed at some point, so it
> >might not be necessary.
> Ok, I'll use the new path; however, I'm not up on all the acronyms used in mailing lists so I don't know what ISTR means.
http://acronyms.thefreedictionary.com/ISTR (only the first two
definitions, for any list I've ever been on).

 So, you have tested that it isn't working correctly for you ?  My
own bootscript has a comment that ignore_nice was for 2.6.12
possibly through to 2.6.15 (in other words, definitely not required
for 2.6.16).  For me  (on an amd x86_64) ondemand works - if I untar
the gcc sources and check /proc/cpuinfo from another term, the speed
jumps from 1000 MHz to 2000, stays there, briefly falls back to
1800 after untarring finishes, then drops to 1000 again shortly

> >Wild guess - the Knoppix kernel is quite a bit older than the LFS
> >kernel ?
> I should have mentioned this in my original post: I'm using Knoppix 5.1.1 released in Jan of this year
> and the kernel is a 2.6 series (might be 2.6.19 but not sure - I'm in Windows right now and can't check)
 I'm guessing that the increased restrictions (limit acpi
frequencies to what the bios returns) were probably in the 2.6.18 to
2.6.20 timeframe.

das eine Mal als Tragödie, das andere Mal als Farce

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