2016-10-13 10:33 GMT-07:00 Géza Gémes <geza.ge...@gmail.com>:

> 2016-10-13 19:28 GMT+02:00 Géza Gémes <geza.ge...@gmail.com>:
>> Hi,
>> Sorry for cross-posting, but I feel this might be an interesting topic
>> for the dev list as well.
>> I've recreated my setup with qemu VM instead of lxc container and the
>> situation is the same.
>> Summary of my setup:
>> Ovs compiled with dpdk (from ubuntu-cloud-archive/newton) deployed on a
>> libvirt VM having 3 network connections to a shared network:
>> [image: Szövegközi kép 3]
>> I've set up two bridges: dpdk-br0 with dpdk and non-dpdk-br1 with kernel
>> datapath each having an interface to the host provided network. For both
>> bridges only the normal action is present, no flows were defined.
> I forgot to mention, that intentionally I didn't use dpdkvhostuser ports
> even with the dpdk datapath bridge as the problem I try to investigate is
> whether there can be traffic in this scenario.

A symptom like the one you describe usually points to problem with offloads.

When the userspace datapath receives packets from "system" devices, the
kernel might forward packets with wrong checksums, if offloads are enabled.

Could you try to disable tx offloads inside the VM (or maybe on the host,
although there shouldn't be any problem with "internal"/"tap" device)?

ethtool -K eth0 tx off
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