Performance analysis of WWW traffic over a DQDB network
Halid Hrasnica, Thorsten Mueller, Ralf Lehnert · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1999
We present a simulation study of WWW traffic over a DQDB network running the TCP/IP protocol stack. All network and protocol elements have been implemented in detail. A realistic DQDB network with 12 nodes and 24 access units is studied. QoS parameters of 552 TCP connections between end users are analyzed. Our traffic source model and its parameters has been chosen according to the characteristics of typical WWW traffic. We have analyzed several network models with different kinds of buffer management in the DQDB access unit. The influence of the buffer management on QoS parameters and transmission performance has been examined. In this paper we describe and compare the results of our investigations for two types of the access unit; with separate buffer management and with shared buffer management. Simulation results for the throughput of the DQDB busses and the loss of IP packets in the DQDB network are given. TCP throughput and transmission times at two protocol levels are measured. Our results show a good utilization of the DQDB network for both types of access units studied.