Re: [atlas-devel] [Math-atlas-devel] CPU throttling

[Mikhail K. <ku...@fr...>]

In message from dean gaudet <de...@ar...> (Fri, 21 Jul 2006 
17:00:30 -0700 (PDT)):
>On Fri, 21 Jul 2006, Clint Whaley wrote:
>> Dean,
>> >the acpi driver is the best first choice -- it requires the bios 
>>support but works cross-architecture.
>> >after that the powernow-k8 and speedstep-centrino modules are the 
>>next best bets... (may even work if you disabled the support in the 
>>bios).
<skipped>
>modprobe...
>i can't remember what my original message said... but i think what i 
>was trying to say was if cpufreq is enabled then it's easy to force 
> the cpu to max frequency... aside from telling the user to 
> modprobe    something  (or 
>doing it for them) there's not much else you can do.
>however i don't think any amd/intel processors change their 
>freq/voltage unless you actually set up one of these methods.  unless > they overheat 
>(which overrides what the user wants anyhow)...

Sorry, are you sure that it's right also for modern dual-core chips, 
especially for last Core-based Intel Xeon/Woodcrest ?

Yours
Mikhail Kuzminsky


>
>only transmeta processors change speed without the kernel being 
>involved... transmeta was also the first to maintain a constant tsc 
>because of this -- because otherwise the kernel gets confused when 
>tsc 
>changes rate without any notice.
>
>if you're seeing frequency changes and you don't have cpufreq 
>installed 
>then are you sure it's not overheating?
>
>i could be totally wrong... there are so many forms of "throttling" 
>now...
>
>-dean
>
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