CPU frequency control

Jon Dixon dixon.jon at gmail.com
Tue Mar 8 11:05:44 UTC 2005

I have a P4 2.53GHz which never used to be supported on Ubuntu for
this, and now it is.

I checked the /proc/cpuinfo and /proc/cpufeq files and indeed it was
scaled down.

However, it appears to be ramping up fine when it needs to and I am
experiencing no obvious performance hits.

- Jon

On Tue, 08 Mar 2005 09:12:44 +0000, Lyndon Drake <lyndon at arotau.com> wrote:
> On Mon, 2005-03-07 at 11:37 -0800, Ryan Thiessen wrote:
> > On Mon, 07 Mar 2005 19:34:14 +0100, Hervé Cauwelier
> > > So powerscaling is functionning properly. You should be happy. :-)
> >
> > No, it's not functioning properly, it's causing severe lag that makes
> > Gnome feel unusable.  I've had the exact same results as Lyndon after
> > moving to hoary and have reported it to bugzilla.  Watch my bug report
> > at https://bugzilla.ubuntu.com/show_bug.cgi?id=7259 to see if anything
> > is found on this.
> The power scaling was kicking in far too quickly (taking the PC down to
> 300MHz in under a minute, I think), and then not picking up quickly
> enough when it needed to.  The big benefit was that the machine was
> running almost silently as the fans were switched off most of the time.
> This was all with powernowd - switching back to cpufreqd results in the
> processor never having its frequency scaled.
> Maybe someone can come up with a better powernowd profile?
> Lyndon
> --
> Lyndon Drake <lyndon at arotau.com>
> http://arotau.com/
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