Ovn network slow

LXD
#1

I am trying to use ovn but I am running into a performance issue.

I have downloaded the speedtest-cli and on the host I am getting 50M up and down
when using lxdfan I am also getting 50M up and down
when using ovn I am getting 6M Down and 6M Up.

I am not even sure where to start troubleshooting this issue.

Thanks in advance.

1 Like
#2

What is your network layout?

Please show lxc network show <uplink network> and lxc network show <ovn network>

#3 
lxc network show UPLINK
config:
  dns.nameservers: 8.8.8.8,1.1.1.1
  ipv4.gateway: 64.X.X.65/28
  ipv4.ovn.ranges: 64.X.X.69-64.X.X.69
  ipv4.routes: 64.X.X.64/28
  volatile.last_state.created: "false"
description: ""
name: UPLINK
type: physical
used_by:
- /1.0/networks/ovn0
managed: true
status: Created
locations:
- lxd1
- lxd2
- lxd3

lxc network show ovn0
config:
  bridge.mtu: "1442"
  dns.domain: foo.net
  ipv4.address: 10.1.1.1/24
  ipv4.nat: "true"
  ipv6.address: fd42:9ce4:b0ee:e3ff::1/64
  ipv6.nat: "true"
  network: UPLINK
  volatile.network.ipv4.address: 64.X.X.69
description: ""
name: ovn0
type: ovn
used_by:
- /1.0/instances/c2
- /1.0/instances/c3
managed: true
status: Created
locations:
- lxd1
- lxd2
- lxd3

lxc network info UPLINK
Error: Network interface "UPLINK" not found
username@lxd1:~$ lxc network status UPLINK
Error: unknown command "status" for "lxc network"
username@lxd1:~$ lxc network info ovn0
Name: ovn0
MAC address: 00:aa:3e:bb:74:d2
MTU: 1442
State: up
Type: broadcast

IP addresses:
  inet	10.1.1.1/24 (link)
  inet6	fd42:9ce4:b0ee:e3ff::1/64 (link)

Network usage:
  Bytes received: 0B
  Bytes sent: 0B
  Packets received: 0
  Packets sent: 0

OVN:
  Chassis: lxd1
#4

speeds are near native if the container is on the host with the chassis

speeds drop by half if the container runs on any of the other hosts.

I tested the same container by stopping and moving it between each of the hosts and testing the speeds

#5

I installed speedtest-cli and iperf
I just issued the command speedtest to test the speeds.

iperf is showing slow traffic between containers.

#6

And you’ve confirmed the speeds between the cluster members is fast outside of OVN?

#7

yes. there is a 10G internode link that is giving 10Gb speeds.

#8

What does ip a on each host show?

#9

We can close this. I used different test tools and it seems to have resolved itself.

I am not sure i understand why i was getting different results with the speedtest tool. But the netflix fast tool is showing proper speeds. Something else might be going on but at the moment i cannot reproduce my earlier results.

1 Like