Performance of a software router using AltQ/CBQ – a measurement-based analysis

Authors:
Daniel Breest;Jean-Alexander Müller
Affiliations:
Department of Computer Science, Leipzig University, Leipzig, Germany;Department of Information Technology and Mathematics, Hochschule für Technik und Wirtschaft Dresden (FH) – University of Applied Sciences, Dresden, Germany
Venue:
QoS-IP'05 Proceedings of the Third international conference on Quality of Service in Multiservice IP Networks
Year:
2005

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Abstract

An AltQ-based software router, using CBQ as key building block, offers a flexible platform to provide service differentiation in the future Internet. This paper presents an experimental analysis of the actual performance and scheduling accuracy of an AltQ/CBQ-based software router, using a very precise hardware-based measuring technique. Our results show, that even though several jitter effects can be estimated very well in advance, they can become considerably large with only a small number of concurrent flows. Moreover, the forwarding performance of the test system is still not sufficient to handle a single Fast Ethernet link, which will lead to an unpredictable delay jitter.