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Predicting short-transfer latency from TCP arcana: extended version

Arlitt, Martin; Krishnamurthy, Balachander; Mogul, Jeffrey C.


Keyword(s): TCP latency; network performance

Abstract: In some contexts it may be useful to predict the latency for short TCP transfers. For example, a Web server could automatically tailor its content depending on the network path to each client, or an "opportunistic networking” application could improve its scheduling of data transfers. Several techniques have been proposed to predict the latency of short TCP transfers based on online measurements of characteristics of the current TCP connection, or of recent connections from the same client. We analyze the predictive abilities of these techniques using traces from a variety of Web servers, and show that they can achieve useful accuracy in many, but not all, cases. We also show that a previously-described model for predicting short-transfer TCP latency can be improved with a simple modification. Ours is the first trace-based analysis that evaluates these prediction techniques across diverse user communities. Notes: This is an extended version of a paper originally published in the Proceedings of the Internet Measurement Conference, 19-21 October 2005, Berkeley, CA, USA

33 Pages

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