netdev - Re: Regression in bonding between 2.6.26.8 and 2.6.27.6

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Date:	Fri, 27 Feb 2009 21:07:30 +0100
From:	Jesper Krogh <jesper@...gh.cc>
To:	Jay Vosburgh <fubar@...ibm.com>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Jeff Garzik <jgarzik@...hat.com>, aowi@...ozymes.com
Subject: Re: Regression in bonding between 2.6.26.8 and 2.6.27.6 - bisected

Jay Vosburgh wrote:
> Jesper Krogh <jesper@...gh.cc> wrote:
> [...]
>> The offending commit seems to be:
>>
>> A test with a fresh 2.6.29-rc6 revealed that the problem has been fixed
>> subsequently.. but still exists in 2.6.27-newest.  (havent tested
>> 2.6.28-newest yet).
>>
>> Any ideas of what the "fixing" commit is .. or should that also be
>> bisected?
> 
> 	I went back and looked at your earlier mail.  Since you're using
> 802.3ad mode, my first guess would be this commit:
> 
> commit fd989c83325cb34795bc4d4aa6b13c06f90eac99
> Author: Jay Vosburgh <fubar@...ibm.com>
> Date:   Tue Nov 4 17:51:16 2008 -0800
> 
>     bonding: alternate agg selection policies for 802.3ad

That didn't do it.. I applied it to 2.6.27.19 but it didnt make that work.
dmesg | grep bond (2.6.27.19 + above patch).

[   13.643301] bonding: MII link monitoring set to 100 ms
[   13.730455] bonding: bond0: enslaving eth0 as a backup interface with 
an up link.
[   13.781934] bonding: bond0: enslaving eth1 as a backup interface with 
an up link.
[   13.904665] bonding: bond0: enslaving eth2 as a backup interface with 
a down link.
[   16.945264] bonding: bond0: link status definitely up for interface eth2.
[   75.040290] bond0: no IPv6 routers present

dmesg | grep bond (2.6.29-rc6)

$ ssh quad02 dmesg | grep bond
[   27.437877] bonding: MII link monitoring set to 100 ms
[   27.445246] ADDRCONF(NETDEV_UP): bond0: link is not ready
[   27.493260] bonding: bond0: enslaving eth0 as a backup interface with 
a down link.
[   27.521397] bonding: bond0: enslaving eth1 as a backup interface with 
a down link.
[   27.542332] bonding: bond0: Warning: No 802.3ad response from the 
link partner for any adapters in the bond
[   27.611509] bonding: bond0: enslaving eth2 as a backup interface with 
a down link.
[   27.617017] ADDRCONF(NETDEV_CHANGE): bond0: link becomes ready
[   27.642330] bonding: bond0: Warning: No 802.3ad response from the 
link partner for any adapters in the bond
[   30.042501] bonding: bond0: link status definitely up for interface eth1.
[   30.142505] bonding: bond0: link status definitely up for interface eth0.
[   30.742547] bonding: bond0: link status definitely up for interface eth2.
[   37.875044] bond0: no IPv6 routers present

I just tested 2.6.28.7.. it still broken. So the fix probably has to be 
somewhere in the post 2.6.28 sets.

-- 
Jesper
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