CPU frequency control
mathbymath at aol.com
Tue Mar 8 15:59:17 UTC 2005
According to my experience, Intel processors have a better track-record
for CPU scaling than AMD processors when it comes to dynamically
changing it. In other words, they're able to change faster.
On Mar 8, 2005, at 6:05 AM, Jon Dixon wrote:
> 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>
>> 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
>>> at https://bugzilla.ubuntu.com/show_bug.cgi?id=7259 to see if
>>> is found on this.
>> The power scaling was kicking in far too quickly (taking the PC down
>> 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
>> This was all with powernowd - switching back to cpufreqd results in
>> processor never having its frequency scaled.
>> Maybe someone can come up with a better powernowd profile?
>> Lyndon Drake <lyndon at arotau.com>
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