netdev - Re: TG3 network data corruption regression 2.6.24/2.6.23.4

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Message-Id: <20080218.163554.74130592.davem@davemloft.net>
Date:	Mon, 18 Feb 2008 16:35:54 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	mchan@...adcom.com
Cc:	tonyb@...ernetics.com, herbert@...dor.apana.org.au,
	netdev@...r.kernel.org, gregkh@...e.de,
	linux-kernel@...r.kernel.org
Subject: Re: TG3 network data corruption regression 2.6.24/2.6.23.4

From: "Michael Chan" <mchan@...adcom.com>
Date: Mon, 18 Feb 2008 16:32:00 -0800

> On Mon, 2008-02-18 at 17:41 -0500, Tony Battersby wrote:
> > I am experiencing network data corruption with a 3Com 3C996B-T NIC
> > (Broadcom NetXtreme BCM5701; driver tg3.ko).  I have identified the
> > following patch as the trigger:
> 
> Assuming this problem is unique to the 5701, I'm not sure how it is
> exposed by Herbert's patch.  One thing unique on the 5701 is that it
> double-copies all RX packets so that the data starts at offset 2, but
> that's quite unrelated to the patch below.

One consequence of Herbert's change is that the chip will see a
different datastream.  The initial skb->data linear area will be
smaller, and the transition to the fragmented area of pages will be
quicker.
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