Theoretical analysis of an ideal startup scheme in multihomed SCTP

Authors:
Johan Eklund;Karl-Johan Grinnemo;Anna Brunstrom
Affiliations:
Department of Computer Science, Karlstad University, Sweden;School of Information and Communication Technology, KTH, Sweden;Department of Computer Science, Karlstad University, Sweden
Venue:
EUNICE'10 Proceedings of the 16th EUNICE/IFIP WG 6.6 conference on Networked services and applications: engineering, control and management
Year:
2010

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Abstract

SCTP congestion control includes the slow-start mechanism to probe the network for available bandwidth. In case of a path switch in a multihomed association, this mechanism may cause a sudden drop in throughput and increased message delays. By estimating the available bandwidth on the alternate path it is possible to utilize a more efficient startup scheme. In this paper, we analytically compare and quantify the degrading impact of slow start in relation to an ideal startup scheme. We consider three different scenarios where a path switch could occur. Further, we identify relevant traffic for these scenarios. Our results point out that the most prominent performance gain is seen for applications generating high traffic loads, like video conferencing. For this traffic, we have seen reductions in transfer time of more than 75% by an ideal startup scheme. Moreover, the results show an increasing impact of an improved startup mechanism with increasing RTTs.