Re: Dothan VID# identification script (was Re: [ACPI] Speedstep-centrino problems)

[Rich Townsend <rhdt@bartol.udel.edu>]

Pallipadi, Venkatesh wrote:
>>-----Original Message-----
>>From: cpufreq-bounces@ZenII.linux.org.uk 
>>[mailto:cpufreq-bounces@ZenII.linux.org.uk] On Behalf Of Rich Townsend
>>Sent: Sunday, February 13, 2005 6:12 AM
>>To: Dominik Brodowski
>>Cc: cpufreq@ZenII.linux.org.uk; Simon Moore
>>Subject: Re: Dothan VID# identification script (was Re: [ACPI] 
>>Speedstep-centrino problems)
>>
>>Dominik Brodowski wrote:
>>
>>>On Sat, Feb 12, 2005 at 06:28:27PM -0500, Rich Townsend wrote:
>>>
>>>
>>>>Of course, we can't guarantee that there will always be a 
>>
>>match; or that 
>>
>>>>there won't be duplicate matches. Also, this approach relies 
>>
>>on having 
>>
>>>>ACPI P-states, to build up the frequency/voltage table. However, it 
>>>>still seems to me to be a pretty robust way of determining 
>>
>>the VID# in a 
>>
>>>>system, and one that could be incorporated into speedstep-centrino. 
>>>>Dominik, what do you think?
>>>
>>>
>>>It indeed seems somewhat robust to me, I'd like to get 
>>
>>Venkatesh's input on
>>
>>>this, though. "Transient voltages" may pose a problem, though...
>>
>>Gak, hadn't thought of that.
>>
> 
> 
> Actually, if you use CNTL MSR in place of STATUS MSR, you don't have to
> worry about transients.

OK! What is the offset of the CNTL MSR? And does it decode to a 
freq/voltage pair in the same way as STATUS?

On a related note, is there a simple way to set the CPU to its maximum 
frequency, without having to know what the associated voltage is?

cheers,

Rich