From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthew East Subject: Re: celeron *clutches at straws* Date: Thu, 6 Jan 2005 17:16:34 +0000 Message-ID: <3bd9116050106091631b1282d@mail.gmail.com> References: <3bd91160501051619632315d0@mail.gmail.com> <20050106161312.GC10011@dominikbrodowski.de> Reply-To: Matthew East Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20050106161312.GC10011@dominikbrodowski.de> 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" To: Matthew East , cpufreq@www.linux.org.uk, linux@dominikbrodowski.de Hi Dominik, > > Whereever I look on the internet a Family 15 Model 2 is reported as a > > Pentium 4!! I know that the chips are similar. So what is the truth? > > Is my chip cpufreq capable or not? > > AFAIK no. Even though many parts of the CPU are similar so that they can be > represented with the same CPUID, Celerons only do have one multiplier so > SpeedStep is not supported on them. > > > If not, is there anything else I can do to save battery power? > > You can use throttling (/proc/acpi/processor/./throttling or the cpufreq - > p4-clockmod driver) to avoid the CPU heating so much the fan has to be > enabled / has to turn at a higher speed which causes an increase in energy > consumption. It doesn't save any real CPU power, though, as the CPU most > likely is put into a good idle power state already (check for C2 or higher > in /proc/acpo/processor/./power ) > > Dominik > That is seriously useful thanks very much. I haven't looked in /proc/acpi/processor before! I have found that the C2 state is supported. mdke@kallisto mdke $ cat /proc/acpi/processor/CPU0/power active state: C2 default state: C1 bus master activity: 00000000 states: C1: promotion[C2] demotion[--] latency[000] usage[07824590] *C2: promotion[--] demotion[C1] latency[002] usage[134432919] C3: mdke@kallisto mdke $ cat /proc/acpi/processor/CPU0/info processor id: 0 acpi id: 0 bus mastering control: yes power management: yes throttling control: yes limit interface: yes Most useful of all will be your information on throttling, which i will experiment with. The last time I tried using throttling (through some kde gui on a mandrake live disk), it made some strange whining noises ;) Is it wholly safe? Noises make me uneasy... but of course cooling down the processor would be nice as my fan is on far too much! I'd like a bit of reassurance before I start though, so I'll post this reply back to the list. Any help is appreciated very much! Thanks again, Matt