From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754569Ab1FJQns (ORCPT ); Fri, 10 Jun 2011 12:43:48 -0400 Received: from out4.smtp.messagingengine.com ([66.111.4.28]:41355 "EHLO out4.smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752889Ab1FJQnp (ORCPT ); Fri, 10 Jun 2011 12:43:45 -0400 X-Sasl-enc: 7fp6se4pkQItnsM86qNv/2Q7YTdNGoGMrm6H2x1mTdqP 1307724224 Date: Fri, 10 Jun 2011 13:43:41 -0300 From: Henrique de Moraes Holschuh To: Mark Lord Cc: Simon Horman , Brad Campbell , Eric Dumazet , Patrick McHardy , Bart De Schuymer , kvm@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, netfilter-devel@vger.kernel.org Subject: Re: KVM induced panic on 2.6.38[2367] & 2.6.39 Message-ID: <20110610164341.GA784@khazad-dum.debian.net> References: <4DEE27DE.7060004@trash.net> <4DEE3859.6070808@fnarfbargle.com> <4DEE4538.1020404@trash.net> <1307471484.3091.43.camel@edumazet-laptop> <4DEEACC3.3030509@trash.net> <4DEEBFC2.4060102@fnarfbargle.com> <1307505541.3102.12.camel@edumazet-laptop> <4DEFAB15.2060905@fnarfbargle.com> <20110610025249.GD643@verge.net.au> <4DF21002.3040708@teksavvy.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4DF21002.3040708@teksavvy.com> X-GPG-Fingerprint: 1024D/1CDB0FE3 5422 5C61 F6B7 06FB 7E04 3738 EE25 DE3F 1CDB 0FE3 User-Agent: Mutt/1.5.20 (2009-06-14) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 10 Jun 2011, Mark Lord wrote: > Something many of us don't realize is that nearly all Intel chipsets > have a built-in hardware watchdog timer. This includes chipset for > consumer desktop boards as well as the big iron server stuff. > > It's the "i8xx_tco" driver in the kernel enables use of them: That's the old module name, but yes, it is very useful in desktops and laptops (when it works). Server-class hardware will have a baseboard management unit that can really power-cycle the system instead of just rebooting. And test it first before you depend on it triggering at a remote location, as the firmware might cause the Intel chipset watchdog to actually hang the box instead of causing a proper reboot (happens on the IBM thinkpad T43, for example). -- "One disk to rule them all, One disk to find them. One disk to bring them all and in the darkness grind them. In the Land of Redmond where the shadows lie." -- The Silicon Valley Tarot Henrique Holschuh From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail6.bemta7.messagelabs.com (mail6.bemta7.messagelabs.com [216.82.255.55]) by kanga.kvack.org (Postfix) with ESMTP id 9F9F36B004A for ; Fri, 10 Jun 2011 12:43:46 -0400 (EDT) Date: Fri, 10 Jun 2011 13:43:41 -0300 From: Henrique de Moraes Holschuh Subject: Re: KVM induced panic on 2.6.38[2367] & 2.6.39 Message-ID: <20110610164341.GA784@khazad-dum.debian.net> References: <4DEE27DE.7060004@trash.net> <4DEE3859.6070808@fnarfbargle.com> <4DEE4538.1020404@trash.net> <1307471484.3091.43.camel@edumazet-laptop> <4DEEACC3.3030509@trash.net> <4DEEBFC2.4060102@fnarfbargle.com> <1307505541.3102.12.camel@edumazet-laptop> <4DEFAB15.2060905@fnarfbargle.com> <20110610025249.GD643@verge.net.au> <4DF21002.3040708@teksavvy.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4DF21002.3040708@teksavvy.com> Sender: owner-linux-mm@kvack.org List-ID: To: Mark Lord Cc: Simon Horman , Brad Campbell , Eric Dumazet , Patrick McHardy , Bart De Schuymer , kvm@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, netfilter-devel@vger.kernel.org On Fri, 10 Jun 2011, Mark Lord wrote: > Something many of us don't realize is that nearly all Intel chipsets > have a built-in hardware watchdog timer. This includes chipset for > consumer desktop boards as well as the big iron server stuff. > > It's the "i8xx_tco" driver in the kernel enables use of them: That's the old module name, but yes, it is very useful in desktops and laptops (when it works). Server-class hardware will have a baseboard management unit that can really power-cycle the system instead of just rebooting. And test it first before you depend on it triggering at a remote location, as the firmware might cause the Intel chipset watchdog to actually hang the box instead of causing a proper reboot (happens on the IBM thinkpad T43, for example). -- "One disk to rule them all, One disk to find them. One disk to bring them all and in the darkness grind them. In the Land of Redmond where the shadows lie." -- The Silicon Valley Tarot Henrique Holschuh -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org