From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934485AbXILPkk (ORCPT ); Wed, 12 Sep 2007 11:40:40 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1764519AbXILPkc (ORCPT ); Wed, 12 Sep 2007 11:40:32 -0400 Received: from outbound-mail-76.bluehost.com ([69.89.22.25]:56579 "HELO outbound-mail-76.bluehost.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1764060AbXILPkb (ORCPT ); Wed, 12 Sep 2007 11:40:31 -0400 X-Greylist: delayed 400 seconds by postgrey-1.27 at vger.kernel.org; Wed, 12 Sep 2007 11:40:31 EDT From: Jesse Barnes To: Thomas Gleixner , linux-kernel@vger.kernel.org Subject: Lossy interrupts on x86_64 Date: Wed, 12 Sep 2007 08:33:15 -0700 User-Agent: KMail/1.9.7 MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200709120833.15980.jbarnes@virtuousgeek.org> X-Identified-User: {642:box128.bluehost.com:virtuous:virtuousgeek.org} {sentby:smtp auth 131.111.214.99 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 I just narrowed down a weird problem where I was losing more than 50% of my vblank interrupts to what seems to be the hires timers patch. Stock 2.6.23-rc5 works fine, but the latest (171) kernel from rawhide drops most of my interrupts unless I also have another interrupt source running (e.g. if I hold down a key or move the mouse I get the expected number of vblank interrupts, otherwise I get between 3 and 30 instead of the expected 60 per second). Any ideas? It seems like it might be bad APIC programming, but I haven't gone through those mods to look for suspects... Thanks, Jesse