使用多个网络探测聚合TCP拥塞控制

P. Pradhan, T. Chiueh, A. Neogi
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引用次数: 44

摘要

对TCP拥塞控制机制的广泛研究已经产生了一种有效的算法,可以相当精确地估计给定网络路径上的可用带宽(J. Postel, 1981;V. Jacobson, 1988)。然而,大多数过去的努力集中在提高单个TCP连接的路径带宽估计算法的准确性和鲁棒性上。通过在具有相同源和目的的并发TCP连接之间共享路径带宽信息来进一步提高数据传输效率的尝试相对较少。本文提出了一种基于聚合TCP的拥塞控制算法(ATCP),该算法允许单个TCP连接更快地达到其可用网络路径带宽的公平份额,同时仍然观察TCP的拥塞控制语义。此外,该算法保证在任何情况下都不会比当前的TCP拥塞控制算法性能差,并以对TCP连接的两端完全透明的方式实现。ATCP对于时间较短但有较长往返延迟的TCP连接特别有用,例如使用HTTP 1.0的Web页面传输。我们的跟踪驱动仿真研究表明,与标准TCP相比,聚合拥塞控制算法可以将规范化事务延迟减少2倍。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Aggregate TCP congestion control using multiple network probing
Extensive research in TCP's congestion control mechanism has resulted in an effective algorithm that gives fairly precise estimates on the available bandwidth on a given network path (J. Postel, 1981; V. Jacobson, 1988). However, most past efforts focused on enhancing the accuracy and robustness of the path bandwidth estimation algorithms for individual TCP connections. Relatively fewer attempts have been made to further improve data transport efficiency by sharing path bandwidth information among concurrent TCP connections with the same sources and destinations. The paper proposes an aggregate TCP-based congestion control algorithm (ATCP) that allows individual TCP connections to reach their fair shares of the available network path bandwidth more quickly, while still observing TCP's congestion control semantics. In addition, the proposed algorithm is guaranteed to perform no worse than current TCP congestion control algorithm in all cases, and is designed to be implemented in a way that is completely transparent to both ends of a TCP connection. ATCP is particularly useful for TCP connections that are short-lived and yet have a long round-trip delay, such as Web page transfers using HTTP 1.0. Our trace-driven simulation study shows that the aggregate congestion control algorithm can reduce the normalized transaction latency by a factor of up to 2, compared to standard TCP.
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