[ovs-discuss] Openstack VM to VM Communication so slow when using OVN+GENEVE

Popoi Zen alterriu at gmail.com
Mon Sep 21 09:14:26 UTC 2020


I have Openstack cluster with following environments:
* 3 Controller+ 2 Compute
* Interfaces example:
bond0: provider network mapped to here using vlan
bond0.2602 at bond0: interface for overlay
br-tun:  172.28.237.13/24 --> bond0.2602 attached to here --> this is
overlay endpoint for Geneve.

On each compute node, I exec this command:

```
ovs-vsctl add-br br-tun
ovs-vsctl add-port br-tun bond0.2602
ip addr delete 172.28.237.13/24 dev bond0.2602
ip addr add 172.28.237.13/24 dev br-tun
sudo ip link set br-tun up
```

I create 2 VM ubuntu0(on compute2) and ubuntu1 (on compute3) then testing
SSH between VM using private IP. It took times ~1 minutes until login
prompt appear.

It seams normal when pinging:
```
ubuntu at ubuntu1:~$ ping ubuntu0
PING ubuntu0 (192.168.5.187) 56(84) bytes of data.
64 bytes from ubuntu0 (192.168.5.187): icmp_seq=1 ttl=64 time=1.13 ms
64 bytes from ubuntu0 (192.168.5.187): icmp_seq=2 ttl=64 time=0.968 ms
64 bytes from ubuntu0 (192.168.5.187): icmp_seq=3 ttl=64 time=0.911 ms
64 bytes from ubuntu0 (192.168.5.187): icmp_seq=4 ttl=64 time=0.567 ms
64 bytes from ubuntu0 (192.168.5.187): icmp_seq=5 ttl=64 time=0.645 ms
64 bytes from ubuntu0 (192.168.5.187): icmp_seq=6 ttl=64 time=0.602 ms
64 bytes from ubuntu0 (192.168.5.187): icmp_seq=7 ttl=64 time=0.635 ms
64 bytes from ubuntu0 (192.168.5.187): icmp_seq=8 ttl=64 time=0.380 ms
64 bytes from ubuntu0 (192.168.5.187): icmp_seq=9 ttl=64 time=0.640 ms
64 bytes from ubuntu0 (192.168.5.187): icmp_seq=10 ttl=64 time=0.523 ms
64 bytes from ubuntu0 (192.168.5.187): icmp_seq=11 ttl=64 time=0.907 ms
64 bytes from ubuntu0 (192.168.5.187): icmp_seq=12 ttl=64 time=0.725 ms
64 bytes from ubuntu0 (192.168.5.187): icmp_seq=13 ttl=64 time=0.574 ms
64 bytes from ubuntu0 (192.168.5.187): icmp_seq=14 ttl=64 time=0.724 ms
64 bytes from ubuntu0 (192.168.5.187): icmp_seq=15 ttl=64 time=1.16 ms
64 bytes from ubuntu0 (192.168.5.187): icmp_seq=16 ttl=64 time=0.947 ms
64 bytes from ubuntu0 (192.168.5.187): icmp_seq=17 ttl=64 time=0.457 ms
64 bytes from ubuntu0 (192.168.5.187): icmp_seq=18 ttl=64 time=0.428 ms
64 bytes from ubuntu0 (192.168.5.187): icmp_seq=19 ttl=64 time=1.08 ms
```

Could someone give me some hint where to start to debug or where is the
issue?
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