Re: Centrino not scaling to lowest frequency

[Felix Homann <fexpop-53koH/AXb86i2/dY4+mD5w@public.gmane.org>]

On Thursday 25 August 2005 17:37, Dominik Brodowski wrote:
> > BTW, Intel's CPU identifiction utility reports a system bus frequency of
> > 400 MHz when the CPU is reported to work at 600 MHz. Usually the system
> > bus is running at 533 MHz. Is this the effect of "throttling" on top of
> > "CPU frequency scaling" or is this something different?
>
> Uh, this is strange. I know of no implementation on Intel CPUs to scale the
> system bus frequency.
>
> However.... Are you relying on centrino-decode of cpufrequtils? IIRC
> it is broken for the 533 MHz case, so if it reports 400 MHz it actually
> means 600 MHz.  *clicketiclick* Yes, cpufrequtils-0.3 still contains this
> bug; need to release 0.4 soon.
>
> 	Dominik

Sorry, I guess I haven't made myself clear enough in the previous mail. The 
Intel tool I mentioned is a Windows utility available here:

http://support.intel.com/support/processors/tools/piu/

When in Windows my Pentium M 730 is reported to run at 600 MHz the Intel tool 
reports a 400 MHz system bus. When the processor is running at  1.60 GHz it 
reports a 533 MHz system bus.

Is there a really reliable tool to get information on the respective 
frequencies?

Regards,

Felix


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