From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rich Townsend Subject: Re: Dothan VID# identification script (was Re: [ACPI] Speedstep-centrino problems) Date: Sun, 20 Feb 2005 09:23:12 -0500 Message-ID: <42189D50.8020501@bartol.udel.edu> References: <88056F38E9E48644A0F562A38C64FB60040DBAD8@scsmsx403.amr.corp.intel.com> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit In-Reply-To: <88056F38E9E48644A0F562A38C64FB60040DBAD8@scsmsx403.amr.corp.intel.com> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: cpufreq-bounces@lists.linux.org.uk Errors-To: cpufreq-bounces+glkc-cpufreq=gmane.org@lists.linux.org.uk Content-Type: text/plain; charset="us-ascii"; format="flowed" To: "Pallipadi, Venkatesh" Cc: cpufreq@ZenII.linux.org.uk, Simon Moore , Dominik Brodowski 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