Comparing different approaches to the use of DiffServ in the internet

McNickle, Don and Addie, Ron (2005) Comparing different approaches to the use of DiffServ in the internet. In: 2005 IEEE Region 10 International Conference (TENCON 2005), 21-24 Nov 2005, Melbourne, Australia.


The existing Internet appears to provide good quality service for a very wide range of services, possibly because
the TCP protocols aim to achieve fair queueing, or processor sharing. The DiffServ architecture aims to do better than this by providing different performance standards for different classes of service. The natural way to apply DiffServ is to allocate classes in accordance with the urgency or priority of the requests. However,another approach is to use DiffServ to allocate service classes according to the 'size' of the requests, where the concept of 'size' can be defined in a variety of ways: total bytes in a flow, rate of a flow, or by a series of token buckets. We use simple queueing models to investigate how much improvement in performance could be obtained by implementing this service discipline, and whether, as a consequence, it is unnecessary and perhaps even dangerous to assign classes of service in accordance with the type of service requested. The results suggest that shortest job first offers considerable advantages over processor sharing. Thus in spite of the difficulties of identifying the size of flows it may be worthwhile to consider how something like shortest job first can be implemented. On the other hand it appears that other priority queue strategies, not based on job size, are risky, in that the marginal advantages gained by favoured jobs are very small, and the majority of jobs can expect to suffer worse response times.

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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
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Faculty / Department / School: Historic - Faculty of Sciences - Department of Maths and Computing
Date Deposited: 11 Oct 2007 00:16
Last Modified: 13 Feb 2017 23:56
Uncontrolled Keywords: differential service; internet architectures; delay; Diffserv networks; protocols; quality management; tagging; web and internet services
Fields of Research : 08 Information and Computing Sciences > 0805 Distributed Computing > 080503 Networking and Communications
08 Information and Computing Sciences > 0805 Distributed Computing > 080505 Web Technologies (excl. Web Search)
15 Commerce, Management, Tourism and Services > 1503 Business and Management > 150313 Quality Management
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970108 Expanding Knowledge in the Information and Computing Sciences
Identification Number or DOI: 10.1109/TENCON.2005.301038

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