From owner-freebsd-mobile@FreeBSD.ORG Mon Nov 3 09:16:07 2008 Return-Path: Delivered-To: freebsd-mobile@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 27884106567B; Mon, 3 Nov 2008 09:16:07 +0000 (UTC) (envelope-from mav@FreeBSD.org) Received: from cmail.optima.ua (cmail.optima.ua [195.248.191.121]) by mx1.freebsd.org (Postfix) with ESMTP id 72E758FC12; Mon, 3 Nov 2008 09:16:06 +0000 (UTC) (envelope-from mav@FreeBSD.org) X-Spam-Flag: SKIP X-Spam-Yversion: Spamooborona-2.1.0 Received: from orphanage.alkar.net (account mav@alkar.net [212.86.226.11] verified) by cmail.optima.ua (CommuniGate Pro SMTP 5.2.9) with ESMTPA id 226841837; Mon, 03 Nov 2008 11:16:05 +0200 Message-ID: <490EC154.9020801@FreeBSD.org> Date: Mon, 03 Nov 2008 11:16:04 +0200 From: Alexander Motin User-Agent: Thunderbird 2.0.0.14 (X11/20080612) MIME-Version: 1.0 To: "Alexandre \"Sunny\" Kovalenko" References: <490DF584.5080506@FreeBSD.org> <1225656933.1202.2.camel@RabbitsDen> <490E245C.7070900@FreeBSD.org> <1225664813.1202.5.camel@RabbitsDen> <490E2D19.1030502@FreeBSD.org> <1225670686.1153.8.camel@RabbitsDen> In-Reply-To: <1225670686.1153.8.camel@RabbitsDen> X-Enigmail-Version: 0.95.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Cc: FreeBSD acpi , freebsd-mobile@FreeBSD.org Subject: Re: Is the C3 possible with SMP? X-BeenThere: freebsd-mobile@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Mobile computing with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 03 Nov 2008 09:16:07 -0000 Alexandre "Sunny" Kovalenko wrote: > When laptop is moving around with me, all USB modules are unloaded and I I will try to unload USB later today. > get about 4 hours of battery life with wireless on, admittedly on the > light usage (reading/writing E-mails, browsing web, typing up occasional > document). I consider this good for 4.4lbs (<2kg) laptop. I have a bit more then 3 hours at the same weight. Which CPU, video and chipset do you have? > OK, so we have C3. Is this the machine you see no difference in power > consumption between C3 and no C3? How did you measure it? Yes. I am using `acpiconf -i 0`. I have no way to measure AC power and I am not sure in precision of such measurements due to limited AC power supply effectiveness. I have some doubts that C3 on only one of two cores could give much benefit. I have already lowered frequency and voltage via EST by powerd. I have turned off most of CPU clocks with Core2Duo C2E state. So, according to what I have read, now only APICs and bus controller are active. As soon as I see timer interrupt on cpu1 it's APIC is not sleeping. Bus controller is shared by cores, so it can't be disabled until at least one core is active. -- Alexander Motin