Preliminary Measurement of the RMTP/RTIP

		       Hui Zhang and Tom Fisher 
	                
		      hzhang,fisher@tenet.Berkeley.EDU
    
                       Computer Science Division 
                University of California at Berkeley 
                         Berkeley, CA 94720


The Real-time Message Transport Protocol (RMTP) and the Real-Time Internetwork
Protocol (RTIP) are the transport and network layer data delivery
protocols in the Tenet Protocol Suite. We implemented the protocols in Ultrix
on the DECstation 5000 workstations and in HP/UX on the HP 9000/7000 
workstations. A preliminary measurement study has been conducted to evaluate 
the performance of the prototype implementation. Some of the results
are: the throughput  obtained by using RMTP/RTIP is comparable to that 
obtained by using raw IP; the rate control mechanism in RMTP/RTIP effectively
enforces the traffic specification of communication clients; the scheduling 
mechanism in RTIP protects the real-time channel so that the performance of 
a real-time channel is not affected by the presence of IP traffic or 
other real-time channels in the network.