CPU frequency control

[Matthew S-H]

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.

~Matt



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> 
> 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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>>
>
>
> -- 
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> can solve them.
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