netdev - Re: PROBLEM: Silent data corruption when using sendfile()

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Message-ID: <1342275540.3265.9760.camel@edumazet-glaptop>
Date:	Sat, 14 Jul 2012 16:19:00 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Hillf Danton <dhillf@...il.com>
Cc:	Johannes Truschnigg <johannes@...schnigg.info>,
	linux-kernel@...r.kernel.org, Willy Tarreau <w@....eu>,
	Linux-Netdev <netdev@...r.kernel.org>
Subject: Re: PROBLEM: Silent data corruption when using sendfile()

On Sat, 2012-07-14 at 22:08 +0800, Hillf Danton wrote:
> On Sat, Jul 14, 2012 at 4:20 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> >
> > Might be, or not (could be a NIC bug)
> >
> Dunno why sendfile sits in the layer of NIC and
> how they interact.

sendfile() relies heavily on TSO capabilities, a buggy NIC could
corrupt frame content on some obscure occasions.

We had some known cases on IPv6 for example.


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