From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752854AbXDNXef (ORCPT ); Sat, 14 Apr 2007 19:34:35 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932282AbXDNXef (ORCPT ); Sat, 14 Apr 2007 19:34:35 -0400 Received: from mms3.broadcom.com ([216.31.210.19]:3252 "EHLO MMS3.broadcom.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752841AbXDNXec (ORCPT ); Sat, 14 Apr 2007 19:34:32 -0400 X-Server-Uuid: 20144BB6-FB76-4F11-80B6-E6B2900CA0D7 Subject: Re: intermittant petabyte usage reported with broadcom nic From: "Michael Chan" To: "CaT" cc: "Andrew Morton" , linux-kernel@vger.kernel.org, netdev@vger.kernel.org In-Reply-To: <20070402074108.GB8345@zip.com.au> References: <20070402014319.GA8345@zip.com.au> <20070402001300.3b66007d.akpm@linux-foundation.org> <20070402074108.GB8345@zip.com.au> Date: Sat, 14 Apr 2007 17:20:01 -0700 Message-ID: <1176596401.5847.7.camel@dell> MIME-Version: 1.0 X-Mailer: Evolution 2.0.2 (2.0.2-8) X-WSS-ID: 6A3FBB7038G17105691-01-01 Content-Type: text/plain Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2007-04-02 at 17:41 +1000, CaT wrote: > On Mon, Apr 02, 2007 at 12:13:00AM -0700, Andrew Morton wrote: > > On Mon, 2 Apr 2007 11:43:19 +1000 CaT wrote: > > > > > I take minute by minute snapshots of network traffic by sampling > > > /proc/net/dev and most of the time everything works fine. Occasionally > > > though I get petabyte byte traffic and corresponding packet traffic. > > > > How frequently? > > I can count about 6 over the past month. > I did a quick test on a 64-bit kernel and did not see any problem with the counters. I'll ask the lab to set up a longer term test and monitor the counters for bogus values. I also like Andi's idea of using change_page_attr() to isolate the problem. I'll try to send you a debug patch in the next few days to try that out. Thanks.