From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Yury V. Umanets" Subject: Re: acpi_processor.c - kernel 2.6.1 Date: Sun, 18 Jan 2004 14:18:48 +0300 Sender: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Message-ID: <1074424728.1914.24.camel@firefly> References: <1074382993.674.24.camel@dragon> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1074382993.674.24.camel-GKM3wtwTCu0@public.gmane.org> Errors-To: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: christian graf Cc: acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: linux-acpi@vger.kernel.org On Sun, 2004-01-18 at 02:43, christian graf wrote: > Hi, Hello, > > reading the /usr/src/linux-2.6.1/drivers/acpi/processor.c > i thought the kernel should set the state dynamically, based on the > load. Maybe it is possible to set the processor-state of my centrino > manually. Can please anybody tell me how to get it right? > There is an user-space daemon, which adjusts CPU speed basing on current loading. And it is able to change CPU frequency if userspace cpufreq governor is turned on. I would like to see this functionality in kernel though. > The reason I'm asking is, that once I do load the processor.ko module, > my Centrino switches immediately into C2-state. It never switches back > to C1 state, even under heavy load like compiling the kernel. > I guess, that there is no code in kernel, which does watch current loading and adjust CPU speed. Also this is job for a cpufreq governor, not for CPU driver. For now, there are three governors: (1) powersave -- setting CPU frequency statically to lowest available frequency. (2) performance -- setting to highest available frequency. (3) userspace -- used for setting CPU frequency manually. Probably there also should be number (4), which will set it basing on current loading. > I think the kernel should switch back from C2 to C1 state from alone???? > > Please ask me whatever you need to help me swtiching back into C1 state. > > christian -- umka ------------------------------------------------------- The SF.Net email is sponsored by EclipseCon 2004 Premiere Conference on Open Tools Development and Integration See the breadth of Eclipse activity. February 3-5 in Anaheim, CA. http://www.eclipsecon.org/osdn