From owner-freebsd-mobile@FreeBSD.ORG Sun Nov 2 18:46:34 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 F40D3106567C; Sun, 2 Nov 2008 18:46:33 +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 9F9C98FC08; Sun, 2 Nov 2008 18:46:32 +0000 (UTC) (envelope-from mav@FreeBSD.org) X-Spam-Flag: SKIP X-Spam-Yversion: Spamooborona-2.1.0 Received: from [212.86.226.226] (account mav@alkar.net HELO mavbook.mavhome.dp.ua) by cmail.optima.ua (CommuniGate Pro SMTP 5.2.9) with ESMTPSA id 226786720; Sun, 02 Nov 2008 20:46:31 +0200 Message-ID: <490DF584.5080506@FreeBSD.org> Date: Sun, 02 Nov 2008 20:46:28 +0200 From: Alexander Motin User-Agent: Thunderbird 2.0.0.17 (X11/20081029) MIME-Version: 1.0 To: FreeBSD acpi , freebsd-mobile@FreeBSD.org Content-Type: text/plain; charset=KOI8-R; format=flowed Content-Transfer-Encoding: 7bit Cc: Subject: 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 18:46:34 -0000 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. -- Alexander Motin