Configurable MTU

Ports are configured with 1500-byte MTU by default. The MTU size is configurable using the mtu_request attribute. The following example shows how to change the MTU size of an existing port.

ovs-vsctl set int dpdkvp0 mtu_request=9000

This sets the MTU to 9000 bytes on dpdkvp0. This means that IP Packets larger than 9000 bytes are dropped on this port. To see the MTU configuration for all ports, run the following command:

ovs-appctl dpctl/show --statistics

An output example:

...
  port 3: dpdkvp0 (dpdk: configured_rx_queues=1, configured_rxq_descriptors=2048, configured_tx_queues=1, configured_txq_descriptors=2048, lsc_interrupt_mode=false, mtu=9000, requested_rx_queues=1, requested_rxq_descriptors=2048, requested_tx_queues=)
    RX packets:51016171 errors:0 dropped:0 overruns:? frame:?
    TX packets:222058411 errors:0 dropped:0 aborted:? carrier:?
    collisions:?
    RX bytes:4640370096 (4.3 GiB)  TX bytes:90159340830 (84.0 GiB)
...