TCP initial window: a study

Authors:
Runa Barik;Dinil Mon Divakaran
Affiliations:
School of Computing and Electrical Engineering, Indian Institute of Technology Mandi, Mandi, India;School of Computing and Electrical Engineering, Indian Institute of Technology Mandi, Mandi, India
Venue:
WWIC'12 Proceedings of the 10th international conference on Wired/Wireless Internet Communication
Year:
2012

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Abstract

The research community has for sometime argued the need to increase the size of TCP initial-window (IW). While it is probably high time that IW-size is increased, we note that a comprehensive study on this front is missing. In this paper, we attempt to build that gap, analyzing the affects increasing IW on various important parameters correlated to the performance of flows. In particular, given the mice-elephant phenomenon, we focus on how the response times of small TCP flows are affected with increasing IW. Our study reveals that, it is difficult to set one single value for IW that improves various parameters such as number of time-outs, retransmission rate, number of spurious time-outs, completion times of flows, etc. Instead, we propose to use a simple function to set the value of IW of a flow depending on the flow-size. Through simulations, we show that such a function performs better.