From mboxrd@z Thu Jan 1 00:00:00 1970 From: Johan Vromans Subject: Re: Centrino speedstep Date: Sat, 01 Jan 2005 11:50:59 +0100 Message-ID: References: <20041228212653.GA8436@dominikbrodowski.de> <20041229181834.GA19199@poupinou.org> <41D42E88.5080800@mega.ist.utl.pt> <41D43A9F.5050507@mega.ist.utl.pt> <16852.15668.315630.700537@phoenix.squirrel.nl> <41D4AA9F.7080200@mega.ist.utl.pt> <20041231082524.GA8312@dominikbrodowski.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: In-Reply-To: <20041231082524.GA8312-X3ehHDuj6sIIGcDfoQAp7BvVK+yQ3ZXh@public.gmane.org> (Dominik Brodowski's message of "Fri, 31 Dec 2004 09:25:24 +0100") Sender: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: linux-acpi@vger.kernel.org Dominik Brodowski writes: > On Fri, Dec 31, 2004 at 01:25:51AM +0000, Pedro Venda wrote: >> also, how exactly can I use ACPI throttling? because with the speestep >> driver, I can't go below 600MHz, but 12% of maximum frequency is 180MHz >> which I can reach using ACPI throttling. > > but throttling doesn't save you anything. Do you have any idea of the actual power savings in relation to frequency scaling and sleep states? E.g., stepping down from 1.6Ghz to 800Mhz will save a lot (50%?), but how much is saved by using C3 state. More interesting, how much savings are lost by not being able to use C3 state? -- Johan ------------------------------------------------------- The SF.Net email is sponsored by: Beat the post-holiday blues Get a FREE limited edition SourceForge.net t-shirt from ThinkGeek. It's fun and FREE -- well, almost....http://www.thinkgeek.com/sfshirt