[ovs-discuss] network bandwidth in Openstack when using OVS+VLAN

Li, Chen chen.li at intel.com
Mon Jul 29 01:48:13 PDT 2013


Hi list,

I'm a new user to OVS.

I installed OpenStack Grizzly, and  using Quantum + OVS + VLAN for network.

I have two compute nodes with 10 Gb NICs, and the bandwidth between them is about  8.49 Gbits/sec (tested by iperf).

I started one instance at each compute node:
instance-a => compute1
instance-b=> compute2
The bandwidth between this two virtual machine is only 1.18 Gbits/sec.

Then I start 6 instances at each compute node:
          (   instance-a => compute1 ) ----- iperf------ > (instance-b=> compute2)
                          (   instance-c => compute1 ) ----- iperf------ > (instance-d=> compute2)
                          (   instance-e => compute1 ) ----- iperf------ > (instance-f=> compute2)
                          (   instance-g => compute1 ) ----- iperf------ > (instance-h=> compute2)
                          (   instance-i => compute1 ) ----- iperf------ > (instance-j=> compute2)
                          (   instance-k => compute1 ) ----- iperf------ > (instance-l=> compute2)
The total bandwidth is only 4.25 Gbits/sec.


Anyone know why the performance is this low ?

Thanks.
-chen
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