In XenEnterprise, virtual networks have an optional i/o priority Quality of Service (QoS) setting for maximum network transfer rate (in KB/s). This setting can be made to existing virtual networks with the CLI as described in this section.

The first parameter is qos_algorithm_type. This parameter needs to be set to the value ratelimit, which is the only type of QoS algorithm supported for virtual networks in this release.

The QoS parameters themselves are set with key/value pairs assigned to the qos_algorithm_params parameter. For virtual networks, qos_algorithm_params takes a kbps key, set to a valid number of kilobytes per second.

For example, the following CLI commands set the virtual networks's VIF to be limited to 100kb/s transfer rate:

xe vif-param-set uuid=<VIF UUID> qos_algorithm_type=ratelimit
xe vif-param-set uuid=<VIF UUID> qos_algorithm_params:kbps=100