Abstract
Re-inserted ECN (re-ECN) is a proposed TCP/IP extension that informs the routers on a path about the estimated level of congestion. The re-ECN protocol extends the Explicit Congestion Notification (ECN) mechanism and reinserts the obtained feedback into the network. This exposure of congestion information is a new economic traffic management mechanism that enables the network to share the available capacity more equally and to police the compliance of congestion control through e. g. a per-user congestion limitation.
This paper studies performance implications of the re-ECN mechanism. Our evaluation is based on simulations with an own re-ECN implementation in the Linux TCP/IP stack. Our results also confirm that congestion exposure generally works. But we also show that traffic characteristics such as the round-trip time (RTT), flow sizes, as well as the selection of congestion control algorithms have a significant impact on the congestion exposure information. These non-trivial effects have to be taken into account when using the re-ECN information as input parameter for congestion control mechanisms in end-systems or for routing/policing inside the network. Comparable results have not been published so far.
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Kühlewind, M., Scharf, M. (2010). Implementation and Performance Evaluation of the re-ECN Protocol. In: Stiller, B., Hoßfeld, T., Stamoulis, G.D. (eds) Incentives, Overlays, and Economic Traffic Control. ETM 2010. Lecture Notes in Computer Science, vol 6236. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-15485-0_5
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DOI: https://doi.org/10.1007/978-3-642-15485-0_5
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