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Date:	Wed, 25 Jan 2012 10:40:59 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Rune Magnussen <rum@...kdata.dk>
Cc:	netdev@...r.kernel.org
Subject: Re: [BISECTED] Linux 3.2: Networking out of LAN does not work

Le mercredi 25 janvier 2012 à 10:35 +0100, Rune Magnussen a écrit :
> Hi
> 
> Networking to and from the outside of my LAN does not work with Linux 
> 3.2.x.
> Linux 3.1.x works. Using ssh from a PC on the LAN also works.
> The machine has a VIA C7 CPU and the NIC uses the 8139too-driver.
> 
> Another machine with a r8169-NIC and an Atom-CPU (32bit) did not 
> show any problems.
> It was used very ligtly though.
> 
> Bisection led to this:
> ---
> f04565ddf52e401880f8ba51de0dff8ba51c99fd is the first bad commit
> commit f04565ddf52e401880f8ba51de0dff8ba51c99fd
> Author: Mihai Maruseac <mihai.maruseac@...il.com>
> Date:   Thu Oct 20 20:45:10 2011 +0000
> 
>     dev: use name hash for dev_seq_ops
>  
>     Instead of using the dev->next chain and trying to resync at each call 
> to
>     dev_seq_start, use the name hash, keeping the bucket and the offset in
>     seq->private field.
>  
>     Tests revealed the following results for ifconfig > /dev/null
>        * 1000 interfaces:
>           * 0.114s without patch
>           * 0.089s with patch
>        * 3000 interfaces:
>           * 0.489s without patch
>           * 0.110s with patch
>        * 5000 interfaces:
>           * 1.363s without patch
>           * 0.250s with patch
>        * 128000 interfaces (other setup):
>           * ~100s without patch
>           * ~30s with patch
>  
>     Signed-off-by: Mihai Maruseac <mmaruseac@...acom.com>
>     Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
>     Signed-off-by: David S. Miller <davem@...emloft.net>
> 
> :040000 040000 2e86e1c9ecaf719d312a8b5863ec9e89d92bc4b3 
> 8b0d09ca105502dd5389bb6281ef059c8bb38667 M   net
> ---
> 
> Simply reverting the commit on top of Linux 3.2.1 resultet in a build 
> error.
> 
> Used kernel configuration: http://knus.info/kernel/config-3.1.txt
> 
> Greetings Rune

It might be a userland error, because order of devices might be
different in :

ip link
cat /proc/net/dev



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