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Date:	Wed, 25 Jan 2012 10:45:30 +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 10:40 +0100, Eric Dumazet a écrit :
> 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
> 
> 

Or it also be a bug introduced by this commit and fixed in
5cac98dd06bc43a
(net: Fix corruption in /proc/*/net/dev_mcast)




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