RFC 6928

Increasing TCP's Initial Window, April 2013

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J. Chu
N. Dukkipati
Y. Cheng
M. Mathis
tcpm (tsv)

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DOI:  http://dx.doi.org/10.17487/RFC6928

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This document proposes an experiment to increase the permitted TCP initial window (IW) from between 2 and 4 segments, as specified in RFC 3390, to 10 segments with a fallback to the existing recommendation when performance issues are detected. It discusses the motivation behind the increase, the advantages and disadvantages of the higher initial window, and presents results from several large-scale experiments showing that the higher initial window improves the overall performance of many web services without resulting in a congestion collapse. The document closes with a discussion of usage and deployment for further experimental purposes recommended by the IETF TCP Maintenance and Minor Extensions (TCPM) working group.

For the definition of Status, see RFC 2026.

For the definition of Stream, see RFC 4844.

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