Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758199Ab2EaOEl (ORCPT ); Thu, 31 May 2012 10:04:41 -0400 Received: from mx1.redhat.com ([209.132.183.28]:31529 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757496Ab2EaOEj (ORCPT ); Thu, 31 May 2012 10:04:39 -0400 Date: Thu, 31 May 2012 10:04:32 -0400 From: Dave Jones To: Eric Dumazet Cc: Thomas Gleixner , Linux Kernel Subject: Re: NOHZ: local_softirq_pending 08 Message-ID: <20120531140432.GC1749@redhat.com> Mail-Followup-To: Dave Jones , Eric Dumazet , Thomas Gleixner , Linux Kernel References: <20120530214809.GA19223@redhat.com> <1338450985.2760.1270.camel@edumazet-glaptop> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1338450985.2760.1270.camel@edumazet-glaptop> 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: 1231 Lines: 36 On Thu, May 31, 2012 at 09:56:25AM +0200, Eric Dumazet wrote: > On Thu, 2012-05-31 at 09:52 +0200, Thomas Gleixner wrote: > > Dave, > > > > On Wed, 30 May 2012, Dave Jones wrote: > > > > > May 30 17:43:04 [ 1095.335659] NOHZ: local_softirq_pending 08 > > > > > > According to git, you ratelimited this back in 2007 with the message > > > "until we found the root cause of that problem." > > > > > > Is this an old problem that has returned ? > > > > Looks like. > > > > > Maybe interesting note: Both machines I see this on regularly are Atom cpus, > > > and it's always '08'. > > > > So it goes idle with NET_RX softirq pending. That really should not > > happen. I fear you need to fire up the tracer :) > > It might be a bug in the network driver, a race with NAPI completion. > > Dave, which net drivers run on these machines ? r8169. I got an email from someone else asking if I used Realtek drivers, which I thought was an uncanny guess. 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/