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Increasing TCP's Initial Window

Document Type Replaced Internet-Draft (individual)
Expired & archived
Authors Jerry Chu , Nandita Dukkipati , Yuchung Cheng , Matt Mathis
Last updated 2012-04-19 (Latest revision 2010-07-12)
Replaced by draft-ietf-tcpm-initcwnd
RFC stream (None)
Intended RFC status (None)
Stream Stream state (No stream defined)
Consensus boilerplate Unknown
RFC Editor Note (None)
IESG IESG state Replaced by draft-ietf-tcpm-initcwnd
Telechat date (None)
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


This document proposes an increase in the permitted TCP initial window (IW) from between 2 and 4 segments, as specified in RFC 3390, to 10 segments. 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 risking congestion collapse. Finally, it outlines a list of concerns to be addressed in future tests.


Jerry Chu
Nandita Dukkipati
Yuchung Cheng
Matt Mathis

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)