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Hi,

I am using openstack victoria and neutron with ovn latest releases. I was
trying to assess network performance between the vms first. I have created
two ubuntu 20.04 VMs installed iperf3 in them and executed a bidirectional
test between VMs. The instance are on same network and network type is
geneve. Both VMs are on same host. I have tested by keeping VM to different
compute hosts, but results are same.

Here are the results.

root at iperf3-1:~# iperf3 -c 192.168.100.50 --bidir
Connecting to host 192.168.100.50, port 5201
[  5] local 192.168.100.120 port 53156 connected to 192.168.100.50 port 5201
[  7] local 192.168.100.120 port 53158 connected to 192.168.100.50 port 5201
[ ID][Role] Interval           Transfer     Bitrate         Retr  Cwnd
[  5][TX-C]   0.00-1.00   sec   311 MBytes  2.61 Gbits/sec  407   1.41
MBytes
[  7][RX-C]   0.00-1.00   sec   627 MBytes  5.26 Gbits/sec
[  5][TX-C]   1.00-2.00   sec  1.07 GBytes  9.18 Gbits/sec  2638   1.71
MBytes
[  7][RX-C]   1.00-2.00   sec   778 MBytes  6.53 Gbits/sec
[  5][TX-C]   2.00-3.00   sec  1.14 GBytes  9.75 Gbits/sec  603   1.98
MBytes
[  7][RX-C]   2.00-3.00   sec   922 MBytes  7.73 Gbits/sec
[  5][TX-C]   3.00-4.00   sec  1.00 GBytes  8.62 Gbits/sec  594   2.16
MBytes
[  7][RX-C]   3.00-4.00   sec   935 MBytes  7.84 Gbits/sec
[  5][TX-C]   4.00-5.00   sec   988 MBytes  8.29 Gbits/sec  2431   1.42
MBytes
[  7][RX-C]   4.00-5.00   sec   932 MBytes  7.82 Gbits/sec
[  5][TX-C]   5.00-6.00   sec   879 MBytes  7.37 Gbits/sec  599    991
KBytes
[  7][RX-C]   5.00-6.00   sec   996 MBytes  8.36 Gbits/sec
[  5][TX-C]   6.00-7.00   sec   721 MBytes  6.05 Gbits/sec  389   1.10
MBytes
[  7][RX-C]   6.00-7.00   sec   963 MBytes  8.08 Gbits/sec
[  5][TX-C]   7.00-8.00   sec   901 MBytes  7.56 Gbits/sec   33   1.54
MBytes
[  7][RX-C]   7.00-8.00   sec  1.02 GBytes  8.79 Gbits/sec
[  5][TX-C]   8.00-9.00   sec   889 MBytes  7.44 Gbits/sec  376   1.33
MBytes
[  7][RX-C]   8.00-9.00   sec  1.14 GBytes  9.78 Gbits/sec
[  5][TX-C]   9.00-10.00  sec   671 MBytes  5.64 Gbits/sec  1017    984
KBytes
[  7][RX-C]   9.00-10.00  sec   975 MBytes  8.19 Gbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID][Role] Interval           Transfer     Bitrate         Retr
[  5][TX-C]   0.00-10.00  sec  8.44 GBytes  7.25 Gbits/sec  9087
  sender
[  5][TX-C]   0.00-10.00  sec  8.44 GBytes  7.25 Gbits/sec
 receiver
[  7][RX-C]   0.00-10.00  sec  9.13 GBytes  7.84 Gbits/sec  7914
  sender
[  7][RX-C]   0.00-10.00  sec  9.12 GBytes  7.84 Gbits/sec
 receiver

Here is the xmldump of instance interface.

    <interface type='bridge'>
      <mac address='fa:16:3e:02:bc:33'/>
      <source bridge='br-int'/>
      <virtualport type='openvswitch'>
        <parameters interfaceid='73e9f047-70de-4d9f-a656-e311dd54975f'/>
      </virtualport>
      <target dev='tap73e9f047-70'/>
      <model type='virtio'/>
      <driver name='vhost' queues='8'/>
      <mtu size='1442'/>
      <alias name='net0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03'
function='0x0'/>
    </interface>

My overlay network IP interface mtu is 1500. Please advise if there is any
network performance tuning required ?
-- 
Regards,


Syed Ammad Ali
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