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 :

quoted

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 [off-list ref]
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 [off-list ref]
    Signed-off-by: Eric Dumazet [off-list ref]
    Signed-off-by: David S. Miller [off-list ref]

: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)