[ovs-discuss] mod_vlan_id affect bandwith a lot

[Li, Chen]

Hi list,

I'm working on Openvswitch + Openstack.

I tested the bandwidth between the virtual machine (host 1) and a physical machine (host 2).

Physical machine       -  >   virtual machine                             2.92 Gbits/sec

virtual machine         -  >   Physical machine                           7.31 Gbits/sec

(The link between host 1 and host 2 is 10 Gbit/sec)

After
1. Stop openvswitch-agent:

service quantum-openvswitch-agent stop
2. removed flow rules on OVS bridge:

ovs-ofctl del-flows br-eth4 in_port=17

ovs-ofctl del-flows br-int in_port=5
3. removed VLAN tag for OVS port:

ovs-vsctl clear port "qvo8fe2b20a-d3" tag

ovs-vsctl clear port "qvo906d5a8c-c1" tag

The network bandwidth between instance and a physical host reached 9.4 Gb/s.
Physical machine       -  >   virtual machine                             9.40 Gbits/sec

virtual machine         -  >   Physical machine                           9.39 Gbits/sec

Looks like mod_vlan_id/add_vlan_id really affect bandwidth a lot.

I want to get higher bandwidth under Openstack, especially for receive side.
Anyone know how to tuning it ?

Thanks.
-chen
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