netdev - Re: intermittant petabyte usage reported with broadcom nic

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Message-ID: <1176596401.5847.7.camel@dell>
Date:	Sat, 14 Apr 2007 17:20:01 -0700
From:	"Michael Chan" <mchan@...adcom.com>
To:	"CaT" <cat@....com.au>
cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: intermittant petabyte usage reported with broadcom nic

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 <cat@....com.au> 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.

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