The controlled load reservation requests a reservation for a guaranteed data rate. The receiver is asking for an IP packet byte rate that is no greater than r*T+b bytes for any arbitrary time of T seconds. The receiver expects to not need more than b bytes of packet space for arriving packets in the TCP/IP stack, while it is busy processing previously received packets. The receiver should request a maximum packet size M no bigger than the composedMTU from the controlled load adspec. When computing r*T+b, packets smaller than m should be treated as if they were size m. The peak rate p in the reservation is checked for validity but usually is ignored.
For more information, refer to Internet RFC 1633, Integrated Services in the Internet Architecture: an Overview, and Internet Draft draft-ietf-intserv-ctrl-load-svc-07.