From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Michael Chan" Subject: Re: intermittant petabyte usage reported with broadcom nic Date: Sat, 14 Apr 2007 17:20:01 -0700 Message-ID: <1176596401.5847.7.camel@dell> References: <20070402014319.GA8345@zip.com.au> <20070402001300.3b66007d.akpm@linux-foundation.org> <20070402074108.GB8345@zip.com.au> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Cc: "Andrew Morton" , linux-kernel@vger.kernel.org, netdev@vger.kernel.org To: "CaT" Return-path: 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 In-Reply-To: <20070402074108.GB8345@zip.com.au> Sender: netdev-owner@vger.kernel.org List-Id: netdev.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.