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doi:10.1016/j.comnet.2004.12.006 
Copyright © 2005 Elsevier B.V. All rights reserved.
Received 29 July 2004;
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Abstract
A problem common to packet markers used in DiffServ architectures is the provision of Quality of Service to TCP flows: specifically, short-lived TCP flows suffer from packet losses at small congestion windows, which inevitably leads to lengthy retransmission timeouts. It would therefore be sensible to mark packets of short-lived flows so as to offer them a greater level of protection. In this work, we propose a class of Fair Markers that, without the penalty of per-flow management, achieves the same performance enhancement of a per-flow marker, but with a much simpler design and limited implementation complexity. Extensive simulations with realistic traffic scenarios and simple analytical models allow us to compare our proposal with existing ones. We also underline the importance of providing a minimum protection to both data and acknowledgment segments of traffic crossing congested domains.
Keywords: DiffServ; TCP; Packet marking; Fairness
Article Outline
- 1. Introduction
- 2. Simulation scenario
- 3. TSW2CM evaluation and drawbacks
- 4. Fair markers architecture
- 4.1. The Flow Classifier
- 4.2. The pre-marker
- 4.3. The rate estimator
- 4.4. The random-marker
- 5. Simulation results
- 6. Modeling TCP flows in DiffServ networks
- 7. Parameter tuning
- 8. Conclusions and future work
- Acknowledgements
- References
- Vitae
