netdev - Re: high rate injection and fragmentation

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Message-Id: <20090209.151058.193026368.davem@davemloft.net>
Date:	Mon, 09 Feb 2009 15:10:58 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	rauhersu@...il.com
Cc:	ilpo.jarvinen@...sinki.fi, netdev@...r.kernel.org
Subject: Re: high rate injection and fragmentation

From: Raúl Hernández <rauhersu@...il.com>
Date: Mon, 9 Feb 2009 18:18:50 +0100

> Hi Ilpo,
> 
> Thanks for your answer, I did not know about that feature. Looking at
> my settings:
> 
> # ethtool -k eth2
> ...
> tcp segmentation offload: on
> 
> I think ethereal hooks up before reaching the TCP offload which is
> handled by the NIC.

No, the packets will be large as created by the TCP stack,
and then the NIC hardware splits them up as it transmits
them onto the wire.
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