From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757240AbXIQTlw (ORCPT ); Mon, 17 Sep 2007 15:41:52 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754400AbXIQTlp (ORCPT ); Mon, 17 Sep 2007 15:41:45 -0400 Received: from outbound-mail-78.bluehost.com ([69.89.22.27]:40619 "HELO outbound-mail-78.bluehost.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1753766AbXIQTlo (ORCPT ); Mon, 17 Sep 2007 15:41:44 -0400 From: Jesse Barnes To: Thomas Gleixner Subject: Re: Lossy interrupts on x86_64 Date: Mon, 17 Sep 2007 12:40:54 -0700 User-Agent: KMail/1.9.7 Cc: Randy Dunlap , linux-kernel@vger.kernel.org References: <200709120833.15980.jbarnes@virtuousgeek.org> <200709171213.21511.jbarnes@virtuousgeek.org> <1190056703.2995.11.camel@chaos> In-Reply-To: <1190056703.2995.11.camel@chaos> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200709171240.55260.jbarnes@virtuousgeek.org> X-Identified-User: {642:box128.bluehost.com:virtuous:virtuousgeek.org} {sentby:smtp auth 67.88.206.99 authed with jbarnes@virtuousgeek.org} X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - box128.bluehost.com X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [642 12] / [47 12] X-AntiAbuse: Sender Address Domain - virtuousgeek.org Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Monday, September 17, 2007, Thomas Gleixner wrote: > On Mon, 2007-09-17 at 12:13 -0700, Jesse Barnes wrote: > > On Wednesday, September 12, 2007, Thomas Gleixner wrote: > > > does it make any difference when you boot the box with: > > > > > > nohz=off > > > > > > on the kernel command line ? > > > > Yeah, that makes a difference: the box hangs when I start > > receiving vblank interrupts instead. However it's not a hard hang, > > I think X just becomes unresponsive. I can still hit the power > > button on the laptop and the machine shuts down gracefully, but > > ctl-alt-delete and ctl-alt-backspace don't work. So X is probably > > still up and in charge of input but may not be getting any more > > timeslices or something. > > Eeek, that sounds scary. Can you add "highres=off" as well ? with nohz=off and highres=off I get a similar but not quite identical hang: the mouse pointer still moves around but my desktop is still hung and glxgears doesn't come up. Behavior is identical without boot options and with highres=off however (i.e. lossy interrupts in both cases). Jesse