From owner-freebsd-mobile@FreeBSD.ORG Tue Aug 17 07:37:52 2004 Return-Path: Delivered-To: freebsd-mobile@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 7DEE316A4CE; Tue, 17 Aug 2004 07:37:52 +0000 (GMT) Received: from t40.kaktusas.org (office.microlink.lt [213.197.128.76]) by mx1.FreeBSD.org (Postfix) with ESMTP id A1FE343D41; Tue, 17 Aug 2004 07:37:51 +0000 (GMT) (envelope-from paulius@devnull.lt) Date: Tue, 17 Aug 2004 10:37:52 +0300 From: Paulius Bulotas To: Colin Percival Message-ID: <20040817073752.GC675@devnull.lt> Mail-Followup-To: Colin Percival , freebsd-mobile@freebsd.org, freebsd-current@freebsd.org References: <6.1.0.6.1.20040816074348.03f99338@popserver.sfu.ca> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <6.1.0.6.1.20040816074348.03f99338@popserver.sfu.ca> X-URL: http://devnull.lt/ cc: freebsd-current@freebsd.org cc: freebsd-mobile@freebsd.org Subject: Re: Enhanced SpeedStep driver available X-BeenThere: freebsd-mobile@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Mobile computing with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 17 Aug 2004 07:37:52 -0000 Hello, On 04 08 16, Colin Percival wrote: > I've also put together a very simple control daemon which > reads kern.cp_time every second and adjusts the cpu frequency > based on the fraction of cpu time which is idle. This increases > my laptop's battery life by around 40%. works with my T40 with Pentium M 1300MHz. Only I doubt it would increase life on battery, since the lowest speed is 600MHz. And if I run on battery all the time, it's always 600MHz. So, now it only raises speed (which still is good, since it makes cpu intensive jobs run faster), but how this could prolong battery life? In normal conditions on battery I can work ~2 hours (and in Windows ~4, but I use them rarely). So now probably less? Or this has to do something with voltage? Paulius