On Thu, 2012-06-07 at 14:27 +0200, Jean-Michel Hautbois wrote:

I made some tests, and I didn't mention it : I am using the bonding
driver over my ethernet drivers (be2net/mlx4 etc.).
When I am using bonding, I need a big txqeuelen in order to send 2.4Gbps.
When I disable bonding, and use directly the NIC then I don't see any
drops in qdisc and it works well.
So, I think there is something between 2.6.26 and 3.0 in the bonding
driver which causes this issue.

What your bond configuration looks like ?

cat /proc/net/bonding/bond0
ifconfig -a
tc -s -d qdisc