Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932088AbWEWOQA (ORCPT ); Tue, 23 May 2006 10:16:00 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932110AbWEWOP7 (ORCPT ); Tue, 23 May 2006 10:15:59 -0400 Received: from aun.it.uu.se ([130.238.12.36]:11984 "EHLO aun.it.uu.se") by vger.kernel.org with ESMTP id S932088AbWEWOP6 (ORCPT ); Tue, 23 May 2006 10:15:58 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <17523.6413.711397.401340@alkaid.it.uu.se> Date: Tue, 23 May 2006 16:15:41 +0200 From: Mikael Pettersson To: Mike Mason Cc: linux-kernel@vger.kernel.org Subject: Re: nmi_watchdog default setting on i386 and x86_64 In-Reply-To: <44724DE3.2000209@us.ibm.com> References: <44724DE3.2000209@us.ibm.com> X-Mailer: VM 7.17 under Emacs 20.7.1 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 774 Lines: 17 Mike Mason writes: > Does anybody know the reasoning behind having nmi_watchdog turned off by > default on i386 and on by default on x86_64. I've heard that i386 had > problems with false positives in the past, but that local apic watchdog > may make that concern obsolete. On i386 the problems are mainly hardware and BIOS. In particular, lots of Dell laptops have capable hardware but broken BIOSen that hang the machines if we try to enable anything sending performance counter interrupts via the local APIC. /Mikael - 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/