Performance sensitivity and fairness of ECN-aware 'modified TCP'

  • Authors:
  • A. Misra;T. Ott

  • Affiliations:
  • IBM T J Watson Research Center, 19 Skyline Drive, Hawthorne, NY;Department of Computer Science, New Jersey Institute of Technology, Newark, NJ

  • Venue:
  • Performance Evaluation
  • Year:
  • 2003

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Abstract

The paper discusses how explicit congestion notification (ECN) can be used to devise an Internet congestion control mechanism that is more rapidly reactive and allows best-effort flows to rapidly adjust to fluctuations in available capacity. Our ECN-mod protocol involves simple modifications to TCP behavior and leverages more aggressive marking-based router feedback. Simulations show that ECN-mod is better than TCP NewReno for both persistent sources and Web-style intermittent traffic sources, and makes the link utilization significantly less sensitive to the variation in the number of active flows. Simulations also show that, while ECN-mod flows obtain a larger portion of the available capacity than conventional best-effort traffic, they do not starve or significantly penalize such TCP-based flows.