Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754763Ab3GJPqT (ORCPT ); Wed, 10 Jul 2013 11:46:19 -0400 Received: from mx1.redhat.com ([209.132.183.28]:14275 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753948Ab3GJPqS (ORCPT ); Wed, 10 Jul 2013 11:46:18 -0400 Date: Wed, 10 Jul 2013 11:45:40 -0400 From: Dave Jones To: Vince Weaver Cc: Ingo Molnar , Thomas Gleixner , Linus Torvalds , Linux Kernel , Peter Anvin , Peter Zijlstra Subject: Re: Yet more softlockups. Message-ID: <20130710154540.GC11309@redhat.com> Mail-Followup-To: Dave Jones , Vince Weaver , Ingo Molnar , Thomas Gleixner , Linus Torvalds , Linux Kernel , Peter Anvin , Peter Zijlstra References: <20130704015525.GA8486@redhat.com> <20130705143821.GB325@redhat.com> <20130705160043.GF325@redhat.com> <20130706072408.GA14865@gmail.com> <20130710151324.GA11309@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1163 Lines: 32 On Wed, Jul 10, 2013 at 11:39:50AM -0400, Vince Weaver wrote: > On Wed, 10 Jul 2013, Dave Jones wrote: > > > Something is really fucked up in the kernel side of perf. > > I get this right after booting.. > > > > [ 114.516619] perf samples too long (4262 > 2500), lowering kernel.perf_event_max_sample_rate to 50000 > > > > That's before I even get a chance to log in, so I'm pretty sure perf isn't even being run. > > > > And this is just booting up my desktop, not fuzzing. > > This is probably related to the problem described in the thread > perf: fix interrupt handler timing harness > http://comments.gmane.org/gmane.linux.kernel/1520775 > which in theory has a fix. Not sure why it'd trigger during boot. Ah, missed that thread. Thanks for the pointer. That looks important, and might actually explain some of the other oddness I've been seeing. > NMI watchdog? likely. Davek -- 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/