netdev - Re: tx-checksumming for an Intel Corporation 82540EP Gigabit Ethernet Controller (Mobile)

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Message-Id: <20080327.040139.233337573.davem@davemloft.net>
Date:	Thu, 27 Mar 2008 04:01:39 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	toralf.foerster@....de
Cc:	netdev@...r.kernel.org
Subject: Re: tx-checksumming for an Intel Corporation 82540EP Gigabit
 Ethernet Controller (Mobile)

From: Toralf Förster <toralf.foerster@....de>
Date: Thu, 27 Mar 2008 11:44:52 +0100

> I'm wondering why I have to add this line in my startup scripts : 
> 
> $> /usr/sbin/ethtool -K eth0 tx off
> to avoid that all outgoing packets have bad check sums (seen with wireshark).
> 
> Wouldn't it makes sense to make this behaviour as default ?

The checksums are computed by the card, so the packets seen by
wireshark simply haven't been checksummed by the card yet.
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