netdev - Re: e100 REGRESSION in 2.6.32

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Message-Id: <200912162246.49611.roger.oksanen@cs.helsinki.fi>
Date:	Wed, 16 Dec 2009 22:46:49 +0200
From:	Roger Oksanen <roger.oksanen@...helsinki.fi>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	"Allan, Bruce W" <bruce.w.allan@...el.com>,
	"Waskiewicz Jr, Peter P" <peter.p.waskiewicz.jr@...el.com>,
	"Ronciak, John" <john.ronciak@...el.com>,
	"e1000-devel@...ts.sourceforge.net" 
	<e1000-devel@...ts.sourceforge.net>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	netdev@...r.kernel.org
Subject: Re: e100 REGRESSION in 2.6.32

On Wednesday 16 December 2009 21:50:38 Alan Stern wrote:
> On Wed, 16 Dec 2009, Brandeburg, Jesse wrote:
> >  Alan thanks for the report, I wonder if 
> > you can revert 98468efddb101f8a29af974101c17ba513b07be1 and see if that 
> > fixes it?
> 
> It does indeed.  Thanks for the quick response.
> 
> > Roger on the To: line made that change, which may have broken e100 for 
> > your system.
> 
> It looks simple enough, but obviously something is wrong with it.

I'm looking into this. Quite a baffling problem though. I have no idea what
causes the last 4 bytes  to change slightly (6c 6b 6b a3). Perhaps the patch 
only changed the timings to uncloak a lurking bug.. 
struct sk_buff has users as it's last member, so perhaps there is a preempt
point in dmapool that triggers a race with the rx path.

I'll try to reproduce this..

-- 
Roger Oksanen <roger.oksanen@...helsinki.fi>
http://www.cs.helsinki.fi/u/raoksane
+358 50 355 1990
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