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World class computing and information science research at Strathclyde...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including by researchers from the Department of Computer & Information Sciences involved in mathematically structured programming, similarity and metric search, computer security, software systems, combinatronics and digital health.

The Department also includes the iSchool Research Group, which performs leading research into socio-technical phenomena and topics such as information retrieval and information seeking behaviour.

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Keeping order: determining the effect of TCP packet reordering

Arthur, C.M. and Harle, D.A. and Lehane, A. (2007) Keeping order: determining the effect of TCP packet reordering. In: Third International Conference on Networking and Services, 2007-06-19 - 2007-06-25.

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Abstract

Packet reordering over TCP/IP networks is a phenomenon which is becoming increasingly important in network performance analysis. Reordering is a consequence of network equipment manufacturers increasing switch and link level parallelism on the Internet, seeking performance, reliability and economical improvements. This paper presents a methodology for simulating and measuring TCP reordering, providing an insight into the behaviours of the congestion and retransmission algorithms, and demonstrating that reordering has a measurable effect on performance. These measurements illustrate that there is a maximum reordering delay threshold that should be applied to packets, regardless of percentage reordering, below which reordering has negligible effects. Determination of this threshold, on a specific path, is key to ensuring that a specific switch or router does not introduce reordering to such an extent that it causes unnecessary retransmissions and an associated reduction in throughput.