Window-Based Error Recovery and Flow Control with a Slow Acknowledgement Channel: A Study of TCP/IP Performance

  • Authors:
  • T. V. Lakshman;B. Suter;U. Madhow

  • Affiliations:
  • -;-;-

  • Venue:
  • INFOCOM '97 Proceedings of the INFOCOM '97. Sixteenth Annual Joint Conference of the IEEE Computer and Communications Societies. Driving the Information Revolution
  • Year:
  • 1997

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Abstract

With the envisaged growth in Internet access services over networks with asymmetric links such as Asymmetric Digital Subscriber Line (ADSL) and Hybrid Fiber Coax (HFC), it becomes crucial to evaluate the performance of window-based protocols over systems in which the reverse link is considerably slower than the forward link. Even if the actual bandwidth asymmetry is moderate, high effective asymmetries can result because of bidirectional traffic. Our objective is to determine, whether TCP/IP performs reasonably in a setting in which the reverse link is the primary bottleneck.Our main results are: (1) For both the prevalent Tahoe version with Fast Retransmit and the Reno version of TCP, we determine the throughput as a function of buffering, round-trip times and (normalized) asymmetry. (2) Asymmetry increases TCP's already high sensitivity to random packet losses. (3) Congestion in the reverse path adds considerably to TCP's unfairness when multiple connections share the reverse link.