From owner-freebsd-mobile@FreeBSD.ORG Sun Nov 2 20:16:05 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 223B61065677; Sun, 2 Nov 2008 20:16:05 +0000 (UTC) (envelope-from gaijin.k@gmail.com) Received: from qw-out-2122.google.com (qw-out-2122.google.com [74.125.92.24]) by mx1.freebsd.org (Postfix) with ESMTP id 780BB8FC25; Sun, 2 Nov 2008 20:16:04 +0000 (UTC) (envelope-from gaijin.k@gmail.com) Received: by qw-out-2122.google.com with SMTP id 9so887403qwb.7 for ; Sun, 02 Nov 2008 12:16:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:subject:from:to:cc :in-reply-to:references:content-type:date:message-id:mime-version :x-mailer:content-transfer-encoding; bh=0t0iupSRV8Qs+C0/ZroGEyzzd59NZf796SRlC0ekOW0=; b=O6QXoDtet1lJhm3wjRK+bG2C71Ui+D2zfggPT57ZobaRZV8g5PL41LjHLmBYD8W0lU ucXKkpldQKa1HqBk8B6B9El9P1wyF+/UZ0iJnlVkTNmZhQtnn+mkV0xBHpBxxt56XgN8 /eFQMjLHui04bv3o/juBt1q6zlg2WPAAOxX+k= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=subject:from:to:cc:in-reply-to:references:content-type:date :message-id:mime-version:x-mailer:content-transfer-encoding; b=KjTW3QHoSFPvaaV9YCOQkv5rPDe130y1aZiQiHNNGE7cDq263M3f1zmJmKxvfZGZ7P 3YTMtoW0Ey/F02lfZXkTIoUpLLhIapyjU+GWj+9E97QjudS+lyoT57ACOh7hUg0/Inzo V3QNHfi+k3l839g1tDnavlH7cDy5Kt29FZmWQ= Received: by 10.214.181.1 with SMTP id d1mr10792963qaf.1.1225656963764; Sun, 02 Nov 2008 12:16:03 -0800 (PST) Received: from ?10.0.3.231? ([70.111.21.88]) by mx.google.com with ESMTPS id 7sm5521358ywo.7.2008.11.02.12.16.02 (version=SSLv3 cipher=RC4-MD5); Sun, 02 Nov 2008 12:16:03 -0800 (PST) From: "Alexandre \"Sunny\" Kovalenko" To: Alexander Motin In-Reply-To: <490DF584.5080506@FreeBSD.org> References: <490DF584.5080506@FreeBSD.org> Content-Type: text/plain; charset=utf-8 Date: Sun, 02 Nov 2008 15:15:33 -0500 Message-Id: <1225656933.1202.2.camel@RabbitsDen> Mime-Version: 1.0 X-Mailer: Evolution 2.22.3.1 FreeBSD GNOME Team Port Content-Transfer-Encoding: 8bit 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: Sun, 02 Nov 2008 20:16:05 -0000 On Sun, 2008-11-02 at 20:46 +0200, Alexander Motin wrote: > Hi. > > I have tried to enable C3 state on my Core2Duo laptop and found that it > is not working good. System HZ timer stops during CPU sleep. After some > investigation I have found that it is due to LAPIC timer used for HZ > stopped during C3 state (same as during AMD's C1E). > > So the question is: Is it possible (or planned) to make it work somehow? > For example, by using some external timer instead of LAPIC's one? > > ACPI reports about 20% less idle power consumption with C3 state > comparing to C2. It would be interesting to get additional half an hour > on battery. > You can get half way there by adding dev.cpu.1.cx_lowest=C3 to /etc/sysctl.conf I do realize that this is not The Solution, but it still saves battery. HTH, -- Alexandre "Sunny" Kovalenko (Олександр Коваленко)