From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bruno Ducrot Subject: Re: powernow-k8 manual voltage selection ? Date: Mon, 20 Dec 2004 15:12:03 +0100 Message-ID: <20041220141203.GO2140@poupinou.org> References: Mime-Version: 1.0 Return-path: Content-Disposition: inline In-Reply-To: List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: cpufreq-bounces@www.linux.org.uk Errors-To: cpufreq-bounces+glkc-cpufreq=gmane.org@www.linux.org.uk Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Nebojsa Trpkovic Cc: cpufreq@www.linux.org.uk Hi, On Sun, Dec 19, 2004 at 04:15:31AM +0300, Nebojsa Trpkovic wrote: > Hello. > > I just got my new box and I'm testing it all day long :) > It's Socket754 AMD Athlon (Newcastle) 3000+. I've spotted that it can run stable (>=1h in prime95) at voltages much lover than it's by default. Default is: > 1.500V @2.0GHz > 1.100V @1.0GHz > And my tests show something like this (I haven't tested all frequencies yet): > 1.525V @2.5GHz > 1.400V @2.4GHz > 1.325V @2.3GHz > 1.250V @2.2GHz > 1.200V @2.1GHz > 1.150V @2.0GHz <--- > 1.075V @1.9GHz > ... and so on. How you have done this? By powernow-k8 or via BIOS setting? If the latter, I will not trust this input yet. You can verify this is OK via cpufrequtils at http://www.kernel.org/pub/linux/utils/kernel/cpufreq/cpufrequtils-0.1.tar.bz2 then go to cpufrequtils-0.1/debug/x86_64 and issue a make, then ./powernow-k8-decode as root. You must have the msr kernel driver loaded to get it working. > My question is: > Is there some way (PATCH) to specify manualy voltages for every FID my CPU can run? This has been discussed some times ago. You have to do it yourself (or maybe ask someone to give you some advice or browse the cpufreq archive, etc). Such patch will never reach mainline (but may be posted to this list for reference purpose only). Cheers, -- Bruno Ducrot -- Which is worse: ignorance or apathy? -- Don't know. Don't care.