Title page for ETD etd-04112007-120231


Document Type Master's Dissertation
Author Strauss, Marthinus David
URN etd-04112007-120231
Document Title A Simulation study of traffic conditioner performance
Degree MSc (Computer Science)
Department Computer Science
Supervisor
Advisor Name Title
Prof D G Kourie
Keywords
  • traffic conditioners
  • Quality of service
  • diffserv
  • FSP.
  • simulation
Date 2006-05-04
Availability unrestricted
Abstract
A traffic conditioner is an element of the Differentiated Services architecture. This

architecture is used to regulate quality of service in computer networks. Five traffic

conditioners were selected for the study. These include the token bucket marker and

four conditioners described in RFCs. The contribution of this dissertation is two-fold.

Firstly, it presents process algebra models of the five identified traffic conditioners.

These models provide succinct descriptions of the conditioners thereby highlighting essential

features. The models are, however, not intended for model checking purposes,

but rather serve as a convenient pedagogical device. The second and main contribution

of the dissertation is a simulation study to investigate the relative performance of

the five traffic conditioners across a range of simulated scenarios in which traffic patterns

and subscription levels are varied in a fixed network topology. Two performance

measures—TargetRatio and GreenRatio—are defined, justified, and used to compare

the traffic conditioners. The GreenRatio measure was found to be more discriminating

than the TargetRatio measure. A variant of the GreenRatio measure was used to

further illuminate the differences between conditioners. The simulation results suggest

that the performance of the conditioners are sensitive to parameter values such

as token bucket size and that bursty traffic patterns are particularly sensitive to these

parameters. Under such bursty conditions, these parameters should be chosen with care.

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