netdev - Re: Gianfar ethernet drop package

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Date:	Fri, 24 Aug 2012 20:17:03 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Aníbal Almeida Pinto <anibal.pinto@...cec.com>
Cc:	netdev@...r.kernel.org
Subject: Re: Gianfar ethernet drop package

On Fri, 2012-08-24 at 17:14 +0100, Aníbal Almeida Pinto wrote:
> Hi,
> 
> I have an board with a ppc with a 8379, kernel 3.0.39 and with a Gianfar 
> Ethernet Controller Version 1.2.
> 
> When connect the board to office network the number of dropped packets 
> reported by ifconfig continues to increase.
> 
> Following the test made at [1] I use tcpdump and when running it the 
> number of drop packages don't have increased.
> 
> When executing ethtool eth0 -S it return a rx-dropped-by-kernel != 0. 
> And the rest of drop packages
> 
> Is possible to get info why the packages are dropped?

You receive frames for unknown protocols. So they are dropped.

When running tcpdump, your tcpdump get them, they are not dropped.

So just parse your tcpdump output ?



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