Quality of Service (QoS)

It is possible to apply both ingress and egress limiting when using the DPDK datapath. These are referred to as QoS and Rate Limiting, respectively.

New in version 2.7.0.

QoS (Egress Policing)

Assuming you have a vhost-user port transmitting traffic consisting of packets of size 64 bytes, the following command would limit the egress transmission rate of the port to ~1,000,000 packets per second:

$ ovs-vsctl set port vhost-user0 [email protected] -- \
    [email protected] create qos type=egress-policer other-config:cir=46000000 \
    other-config:cbs=2048`

To examine the QoS configuration of the port, run:

$ ovs-appctl -t ovs-vswitchd qos/show vhost-user0

To clear the QoS configuration from the port and ovsdb, run:

$ ovs-vsctl destroy QoS vhost-user0 -- clear Port vhost-user0 qos

Refer to vswitch.xml for more details on egress policer.

Rate Limiting (Ingress Policing)

Assuming you have a vhost-user port receiving traffic consisting of packets of size 64 bytes, the following command would limit the reception rate of the port to ~1,000,000 packets per second:

$ ovs-vsctl set interface vhost-user0 ingress_policing_rate=368000 \
    ingress_policing_burst=1000`

To examine the ingress policer configuration of the port:

$ ovs-vsctl list interface vhost-user0

To clear the ingress policer configuration from the port:

$ ovs-vsctl set interface vhost-user0 ingress_policing_rate=0

Refer to vswitch.xml for more details on ingress policer.

Flow Control

Flow control is available for DPDK physical ports. For more information, refer to Flow Control.