TCP的协议半径:计时器阻止通信的距离

L. Wood, C. Peoples, G. Parr, B. Scotney, A. Moore
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引用次数: 17

摘要

我们研究了传输控制协议(TCP)的设计如何隐含地假设通信端点之间的路径延迟和距离的有限范围。我们表明,由于TCP实现中存在的各种计时器的相互作用,TCP不太适合较大的延迟,这会限制性能,最终,随着距离的增加,通信能力也会受到限制。我们通过模拟建立的性能和协议半径指标表明TCP协议如何随着两个通信节点之间距离半径的增加而执行,并显示协议经历可见性能变化的边界。这使我们能够评估TCP对长延迟通信的适用性,包括对深空链路的适用性。
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TCP's protocol radius: the distance where timers prevent communication
We examine how the design of the Transmission Control Protocol (TCP) implicitly presumes a limited range of path delays and distances between communicating endpoints. We show that TCP is less suited to larger delays due to the interaction of various timers present in TCP implementations that limit performance and, eventually, the ability to communicate at all as distances increase. The resulting performance and protocol radius metrics that we establish by simulation indicate how the TCP protocol performs with increasing distance radius between two communicating nodes, and show the boundaries where the protocol undergoes visible performance changes. This allows us to assess the suitability of TCP for long-delay communication, including for deep-space links.
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