Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751773Ab2FFBrN (ORCPT ); Tue, 5 Jun 2012 21:47:13 -0400 Received: from mx1.redhat.com ([209.132.183.28]:38852 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751103Ab2FFBrM (ORCPT ); Tue, 5 Jun 2012 21:47:12 -0400 Date: Tue, 5 Jun 2012 21:46:56 -0400 From: Dave Jones To: Francois Romieu Cc: Marc Dionne , Thomas Gleixner , Linux Kernel Subject: Re: NOHZ: local_softirq_pending 08 Message-ID: <20120606014656.GA24870@redhat.com> Mail-Followup-To: Dave Jones , Francois Romieu , Marc Dionne , Thomas Gleixner , Linux Kernel References: <20120530214809.GA19223@redhat.com> <20120601225754.GA25281@electric-eye.fr.zoreil.com> <20120605231550.GA20981@electric-eye.fr.zoreil.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20120605231550.GA20981@electric-eye.fr.zoreil.com> 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: 1886 Lines: 46 On Wed, Jun 06, 2012 at 01:15:50AM +0200, Francois Romieu wrote: > Marc Dionne : > > If it helps, I've been seeing the same thing here on a system with an > > r8169. The message appears consistently enough on network startup to > > be able to track it down to this specific commit: > > 98ddf986fca17840e46e070354b7e2cd2169da15: r8169: bh locking redux > > and task scheduling. > > > > The softirq pending messages always come right after "link down" > > messages for the interface. for me, they're during boot when the nic comes up, and then very occasionally afterwards. > Let's see the traces. > > I have added some code to trace the timing and values of the irq in > rtl8169_interrupt(). Patches against current git are attached. with these patches applied, I get a lot of spew in dmesg like .. [ 98.659314] r8169 0000:01:00.0: eth0: event ring full. [ 98.763513] r8169 0000:01:00.0: eth0: event ring full. [ 99.182103] r8169 0000:01:00.0: eth0: event ring full. [ 99.294426] r8169 0000:01:00.0: eth0: event ring full. [ 99.420255] r8169 0000:01:00.0: eth0: event ring full. [ 99.455811] r8169 0000:01:00.0: eth0: event ring full. [ 99.520541] r8169 0000:01:00.0: eth0: event ring full. [ 99.730789] r8169 0000:01:00.0: eth0: event ring full. [ 99.887643] r8169 0000:01:00.0: eth0: event ring full. [ 103.798861] net_ratelimit: 43 callbacks suppressed over and over.. > 'ip link set dev 8168b-lom up' + 'cat /sys/kernel/debug/tracing/trace': What tracer do I need to configure to get make this work ? irqsoff ? finally, /sys/kernel/debug/r8169/ is empty. Dave -- 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/