Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751073AbXBVQ1h (ORCPT ); Thu, 22 Feb 2007 11:27:37 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751212AbXBVQ1h (ORCPT ); Thu, 22 Feb 2007 11:27:37 -0500 Received: from 85.8.24.16.se.wasadata.net ([85.8.24.16]:44316 "EHLO smtp.drzeus.cx" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751073AbXBVQ1g (ORCPT ); Thu, 22 Feb 2007 11:27:36 -0500 Message-ID: <45DDC488.1080008@drzeus.cx> Date: Thu, 22 Feb 2007 17:27:52 +0100 From: Pierre Ossman User-Agent: Thunderbird 1.5.0.9 (X11/20070212) MIME-Version: 1.0 To: tglx@linutronix.de CC: Arjan van de Ven , Jan Engelhardt , Luca Tettamanti , linux-kernel@vger.kernel.org Subject: Re: NO_HZ: timer interrupt stuck [Re: Linux 2.6.21-rc1] References: <20070221230409.GA1158@dreamland.darkstar.lan> <1172099859.25076.132.camel@localhost.localdomain> <1172150712.3531.265.camel@laptopd505.fenrus.org> <45DDA43A.4030509@drzeus.cx> <1172154034.3531.270.camel@laptopd505.fenrus.org> <45DDADEB.3030309@drzeus.cx> <45DDB31C.8070306@drzeus.cx> <1172160024.25076.188.camel@localhost.localdomain> In-Reply-To: <1172160024.25076.188.camel@localhost.localdomain> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1019 Lines: 28 Thomas Gleixner wrote: > > Here is the reason. The local APIC stops working in C3 state and we fall > back to the PIT in that case. Not really exciting for dynticks, but the > only way to keep the system alive. There is a patch coming up from > Intel, which finds out how to use HPET even if it is not enabled by the > BIOS. This will still end up on IRQ#0, but will give way longer idle > sleeps than the PIT. > > So then the next two questions are; is it possible to disable C3 and is it a net power gain to get rid of the wakeups in favor of having C3. Rgds -- -- Pierre Ossman Linux kernel, MMC maintainer http://www.kernel.org PulseAudio, core developer http://pulseaudio.org rdesktop, core developer http://www.rdesktop.org - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/