What determines the arrival rate and service rate for IP QoS buffers?

What determines the arrival rate and service rate for IP QoS buffers?

You can specify a processing speed for the IP QoS buffer using the Interface Information attribute under IP QoS Parameters. When Reserved Bandwidth Type is set to Absolute, then the value specified under Maximum Reserved Bandwidth attribute determines the buffer's processing speed in bits per second. If the type is Relative, then Maximum Reserved Bandwidth specifies the percentage of the link bandwidth that is used as the processing speed.Once packets arrive at a router, the rate at which packets arrive at the buffer of the output interface depends on the routing speed of the router. A router's speed is specified using the attributes found under the compound attribute IP > IP Processing Information. Note that the service rate specified under this attribute will be serving to all output interfaces. If there are multiple active output interfaces, then the packet arrival rate for one output interface will be only a portion of that service rate.The attribute IP > IP Routing Parameters >Interface Information > Interface Speed is not used by IP QoS. For more information about the purpose of this attribute please refer to its description.

Protocols->QoS