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Comprehensive performance model of differentiated service with token bucket marker

Summary: Comprehensive performance model of differentiated
service with token bucket marker
H. Su and M. Atiquzzaman
Abstract: Differentiated services (DiffServ) networks use two type of routers: edge routers mark
the packet headers according to their service profile, while the core routers implement queue
management to provide service differentiation between packets according to information in their
packet headers. Most previous studies on the performance of DiffServ have considered either the
effect of the edge marking scheme or the effect of core queue management on the throughput of
TCP applications. To study the combined effect of marking at the edge router and queue
management at the core router on the performance of DiffServ, the authors propose a simple
model that takes into consideration the committed information rate and maximum allowed burst
size of the marker, in addition to the number of flows in an aggregate, round trip time, and the
probability of a packet dropping at the core network. Observations from the model are presented,
and simulations were performed to validate the accuracy of the model. The model shows that the
performance of DiffServ is largely flow-based rather than desired-aggregate-based, and the
DiffServ network suffers from unfairness issues.
1 Introduction
The Internet has successfully provided a worldwide data
communication service for the past few decades. However,
it does not provide any quality of service (QoS) guarantee to


Source: Atiquzzaman, Mohammed - School of Computer Science, University of Oklahoma


Collections: Computer Technologies and Information Sciences