Re: e1000 and bonding overruns with jumbo

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Philip -

You will probably get better answers if you send this to
netdev@xxxxxxxxxxxxxxx and bonding-devel@xxxxxxxxxxxxxxxxxxxxxx  That
way you'll get the attention of the various developers.

Jason

On 6/26/05, Philip Molter <philip@xxxxxxxxxxxxxxx> wrote:
> I have this scenario with a dual-Intel gigabit machine setup with
> channel bonding:
> 
> eth0 : MTU 9000, slave to bond0
> eth1 : MTU 9000, slave to bond0
> bond0: MTU 9000, bonding mode=5 (also happens with bonding mode=1)
> 
> This box takes small broadcast packets in on both interfaces, small
> request packets in on the primary incoming interface, and sends out huge
> packets out both interfaces.  After letting this setup run for about 20
> minutes, I can issue an 'ethtool -G eth0 rx 1024'.  The interface will
> reset, as expected.  The bonding will fail over to eth1, as expected.
> When eth0 is redetected, eth1 will start logging huge number of overruns
> (4-5k pkts/sec) and networking will effectively stop until eth1 is
> disabled.  A reboot is required to fix this problem.  Unloading and
> reloading the network driver or toggling its link status will not fix it.
> 
> This is the semi-reproducible case.  It's actually a bigger problem for
> me because this situation can happen spontaneously for seemingly no
> reason, although it's often (not always) tied to a bonding failover.
> 
> Does anyone have any ideas?  It doesn't happen with the tg3 driver, and
> it doesn't happen if the interfaces aren't handling jumbo packets.  It
> also needs to run for a while before the ethtool trick will trigger it,
> although it's entirely reproducible otherwise.
> 
> Thank you for any information,
> Philip
> 
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