From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ivor Hewitt Subject: Re: starting governor ondemand failed Date: Mon, 04 Apr 2005 14:50:51 +0100 Message-ID: <4251463B.6000300@ivor.org> References: <42511A0B.1070008@ivor.org> <20050404124304.GA17732@isilmar.linta.de> <425140A7.6020804@ivor.org> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <425140A7.6020804@ivor.org> Content-Disposition: inline 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: Ivor Hewitt Cc: cpufreq@ZenII.linux.org.uk, Dominik Brodowski Ivor Hewitt wrote: > Dominik Brodowski wrote: > >> On Mon, Apr 04, 2005 at 11:42:19AM +0100, Ivor Hewitt wrote: >> >>> Hi, >>> I was trying to have a play with the ondemand governor but I just get >>> the following logged when I try to switch to it:- >>> >>> cpufreq-core: governor switch >>> cpufreq-core: __cpufreq_governor for CPU 0, event 2 >>> userspace: managing cpu 0 stopped >>> cpufreq-core: __cpufreq_governor for CPU 0, event 1 >>> cpufreq-core: starting governor ondemand failed >>> cpufreq-core: __cpufreq_governor for CPU 0, event 1 >>> >>> This is on a PIIIM using the speedstep-smi interface. >>> The cpu is only capable of switching between two frequencies, would >>> this prevent ondemand starting up? >> >> >> This isn't the problem, but the following: we do not know how long >> transitions using speedstep-smi take, therefore we still need to assume >> that it takes very long, thus making it unable to be used for ondemand >> frequency switching. >> > Hi, > I'll stick to to cpufreqd then. :-) > > Ah I see "CPUFREQ_ETERNAL". > > What should be an acceptable transition time? Is it possible for me to > determine my speedstep-smi transition time and enable the switching? > Or are you saying that there's no way of knowing how long the smi > transition would take, therefore it has to be disabled? > Ok terrible form replying to myself! :-) Using the magic transition value of 10000 seems to behave nicely; idling along nicely, kick off a compile and it turns the dial up to '11'. Since I only have two frequency choices does the transition time matter that much? Cheers, -- Ivor http://www.ivor.it