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A new method for analysing feedback-based protocols with applications to engineering Web traffic over the Internet

Published: 01 June 1997 Publication History
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  • Abstract

    Most of the studies of feedback-based flow and congestion control consider only persistent sources which always have data to send. However, with the rapid growth of Internet applications built on TCP/IP such as the World Wide Web and the standardization of traffic management schemes such as Available Bit Rate (ABR) in Asynchronous Transfer Mode (ATM) networks, it is essential to evaluate the performance of feedback-based protocols using traffic models which are specific to dominant applications. This paper presents a method for analysing feedback-based protocols with a Web-user-like input traffic where the source alternates between "transfer" periods followed by "think" periods. Our key results, which are presented for the TCP protocol, are:(1) The goodputs and the fraction of time that the system has some given number of transferring sources are insensitive to the distributions of transfer (file or page) sizes and think times except through the ratio of their means. Thus, apart from network round-trip times, only the ratio of average transfer sizes and think times of users need be known to size the network for achieving a specific quality of service.(2) The Engset model can be adapted to accurately compute goodputs for TCP and TCP over ATM, with different buffer management schemes. Though only these adaptations are given in the paper, the method based on the Engset model can be applied to analyze other feedback systems, such as ATM ABR, by finding a protocol specific adaptation. Hence, the method we develop is useful not only for analysing TCP using a source model significantly different from the commonly used persistent sources, but also can be useful for analysing other feedback schemes.(3) Comparisons of simulated TCP traffic to measured Ethernet traffic shows qualitatively similar autocorrelation when think times follow a Pareto distribution with infinite variance. Also, the simulated and measured traffic have long range dependence. In this sense our traffic model, which purports to be Web-user-like, also agrees with measured traffic.

    References

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    T. V. Lakshman and U. Madhow, "Performance Analysis of Window-Based Flow Control using TCP/IP: the Effect of High Bandwidth-Delay Products and Random Loss" IFIP 7Yansactions C-26, High Performance Networking V, pp. 135-150, North-HoUand, 1994.
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    T. V. Lakshman, A. Neidhardt and T. J. Ott, "The Drop from Front Strategy in TCP over ATM and its Interworking with other Control Features", Proceeding of IEEE Infoeom 1996, pp. 1242-1250, April 1996.
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    S. Shenker, L. Zhang, and D. D. Clark, "Some Observations on the Dynamics of a Congestion Control Algorithm," Computer Communication Review, pp. 30-39, October 1990.
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    W. Willinger, M.S. Taqqu, W. E. Leland and D. V. Wilson, "On the Self-Similar Nature of Ethernet Traffic", IEEE Transactions on Networking, vol. 2, No. 1, pp. 1-15, 1994.
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    G. R. Wright and W. R. Stevens, "TCP/IP Illustrated, Volume 2, The Implementation", Addison Wesley, 1995.
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    Published In

    cover image ACM SIGMETRICS Performance Evaluation Review
    ACM SIGMETRICS Performance Evaluation Review  Volume 25, Issue 1
    June 1997
    298 pages
    ISSN:0163-5999
    DOI:10.1145/258623
    Issue’s Table of Contents
    • cover image ACM Conferences
      SIGMETRICS '97: Proceedings of the 1997 ACM SIGMETRICS international conference on Measurement and modeling of computer systems
      June 1997
      302 pages
      ISBN:0897919092
      DOI:10.1145/258612
    Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected]

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    Association for Computing Machinery

    New York, NY, United States

    Publication History

    Published: 01 June 1997
    Published in SIGMETRICS Volume 25, Issue 1

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    • (2014)Evaluating user-perceived performance in high-speed backhaul networks2014 16th International Telecommunications Network Strategy and Planning Symposium (Networks)10.1109/NETWKS.2014.6959254(1-6)Online publication date: Sep-2014
    • (2014)Towards stochastic flow-level network modeling: Performance evaluation of short TCP flows39th Annual IEEE Conference on Local Computer Networks10.1109/LCN.2014.6925817(462-465)Online publication date: Sep-2014
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