This is still a bug on Xenial with OpenvSwitch-2.6 and DPDK-16.07, from
Ubuntu Cloud Archive.

I just crashed the OVS+DPDK running at the host, right after trying to
enable multiqueue inside of a KVM Guest, also running OVS+DPDK.

NOTE: Multiqueue was enabled at the host in advance, on both OVS and
Libvirt VM XML.

I also noted that right after enabling 2 queues at the host, the speed
improved inside of the running guest! Without doing anything with it.
But, then, after trying to enable multiqueue at the KVM guest, on its
OVS+DPDK on top of VirtIO, host crashed.

After running on the KVM Guest:

---
root@ubuntu-ovs-dpdk-vm-1:~# ovs-vsctl set interface dpdk0 options:n_rxq=2 ; 
ovs-vsctl set interface dpdk1 options:n_rxq=2
---

At the host, ovs-vswitchd crashed:

---
root@ubuntu-ovs-dpdk-kvm-1:~# tail -F /var/log/openvswitch/ovs-vswitchd.log
......
2016-12-02T04:11:28.578Z|00127|dpdk(vhost_thread2)|INFO|State of queue 0 ( 
tx_qid 0 ) of vhost device '/var/run/openvswitch/vhost-user1'changed to 
'enabled'
2016-12-02T04:11:28.578Z|00128|dpdk(vhost_thread2)|INFO|State of queue 2 ( 
tx_qid 1 ) of vhost device '/var/run/openvswitch/vhost-user1'changed to 
'enabled'
2016-12-02T04:11:28.956Z|00002|daemon_unix(monitor)|ERR|1 crashes: pid 3841 
died, killed (Segmentation fault), core dumped, restarting
---

I REALLY want to be able to use DPDK Apps, on top of OVS+DPDK at the
host but, it still looks unstable to me.

:-(

** Summary changed:

- OVS+DPDK segfault at the host, after running "ovs-vsctl set Open_vSwitch . 
other_config:n-dpdk-rxqs=4" within a KVM Guest
+ OVS+DPDK segfault at the host, after running "ovs-vsctl set interface dpdk0 
options:n_rxq=2 " within a KVM Guest

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https://bugs.launchpad.net/bugs/1577088

Title:
  OVS+DPDK segfault at the host, after running "ovs-vsctl set interface
  dpdk0 options:n_rxq=2 " within a KVM Guest

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