Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757928Ab2EaH4b (ORCPT ); Thu, 31 May 2012 03:56:31 -0400 Received: from mail-bk0-f46.google.com ([209.85.214.46]:40714 "EHLO mail-bk0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757764Ab2EaH4a (ORCPT ); Thu, 31 May 2012 03:56:30 -0400 Subject: Re: NOHZ: local_softirq_pending 08 From: Eric Dumazet To: Thomas Gleixner Cc: Dave Jones , Linux Kernel In-Reply-To: References: <20120530214809.GA19223@redhat.com> Content-Type: text/plain; charset="UTF-8" Date: Thu, 31 May 2012 09:56:25 +0200 Message-ID: <1338450985.2760.1270.camel@edumazet-glaptop> Mime-Version: 1.0 X-Mailer: Evolution 2.28.3 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 981 Lines: 30 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 ? -- 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/