Neutron, openvswitch jumbo packets

[ed bond]

Anyone have experience with the charms to be able to set the MTU to jumbo packets?

Right now in testing to see if it would work we had to do this:

for i in `ip a | grep mtu| egrep -ve "eth0|eth1|eth2|eth3|bond0|lo|juju-br0" | awk '{print $2}' | awk -F: '{print $1}'`; do ip link set ${i} mtu 8900; done

We were able to get 6.5 Gigabit/s throughput with enabling jumbo packets. 


ubuntu at 3-885bd897-3655-42ab-b0b9-a97b31826f88:~$ sudo ip link set dev ens3 mtu 8000
ubuntu at 3-885bd897-3655-42ab-b0b9-a97b31826f88:~$ sudo iperf -c 192.168.10.116 -i1 -t 10 -m
…
[  3] local 192.168.10.115 port 33920 connected with 192.168.10.116 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0- 1.0 sec   845 MBytes  7.09 Gbits/sec
[  3]  1.0- 2.0 sec   781 MBytes  6.55 Gbits/sec
[  3]  2.0- 3.0 sec   762 MBytes  6.40 Gbits/sec
[  3]  3.0- 4.0 sec   758 MBytes  6.36 Gbits/sec

Any openstack charmers have some insight? 

- Ed
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