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 17:45:04 +0100 Message-ID: <20041220164504.GP2140@poupinou.org> References: <20041220141203.GO2140@poupinou.org> <41C6F43F.4000306@gmail.com> Mime-Version: 1.0 Return-path: Content-Disposition: inline In-Reply-To: <41C6F43F.4000306@gmail.com> 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 On Mon, Dec 20, 2004 at 04:48:15PM +0100, Nebojsa Trpkovic wrote: > Bruno Ducrot wrote: > > >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. > > > > > I've done that by some software tool in window$ (I just didn't want to > lock up system several times in my Gentoo :) ). By that tool (can't > remember name) I was able to change multiplicators and voltages. I was > monitoring voltages by other 2 tools and I could saw that my mobo > overvolts CPU a little bit under heavy load, but it's about ~0.000V > @0.800V, ~0.025V @1.100V and ~0.050V @1.5V > I've tried to undervolt in BIOS and it worked, too. But, my BIOS allows > only 0.9V and by software I was able to go under that voltage. Here you > can see results (all of them passed few hours in prime): > > http://www.aaen.edu.yu/~tnt/graf.png > > Now, I'm running at 2.385MHz at 1.425V and under full load my lm_sensors > show VCore = 1.46V Could you please ./powernow-k8-decode in this case (nb: powernow-k8-decode do not need powernow-k8). > I'll try to play a little bit more when I get 1 x 512MB module, as my > mobo would lock up every time I try to change something on the fly with > 2 modules. It's comon issue with Socket 754 boards. > > >Such patch will never reach mainline (but may be posted to this list for > >reference purpose only). > > > > > Yes... I guess so... I'm a little bit sad because linux becomes such > conservative... linux have been always conservative in mainline if running hardware out-of-spec AFAIK. Cheers, -- Bruno Ducrot -- Which is worse: ignorance or apathy? -- Don't know. Don't care.