[rfc-dist] RFC 3742 on Limited Slow-Start for TCP with Large Congestion Windows

rfc-editor at rfc-editor.org rfc-editor at rfc-editor.org
Tue Mar 30 16:56:19 PST 2004

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        RFC 3742

        Title:      Limited Slow-Start for TCP with Large Congestion
        Author(s):  S. Floyd
        Status:     Experimental
        Date:       March 2004
        Mailbox:    floyd at icir.org
        Pages:      7
        Characters: 14840
        Updates/Obsoletes/SeeAlso:    None

        I-D Tag:    draft-ietf-tsvwg-slowstart-00.txt

        URL:        ftp://ftp.rfc-editor.org/in-notes/rfc3742.txt

This document describes an optional modification for TCP's slow-start
for use with TCP connections with large congestion windows.  For TCP
connections that are able to use congestion windows of thousands (or
tens of thousands) of MSS-sized segments (for MSS the sender's MAXIMUM
SEGMENT SIZE), the current slow-start procedure can result in
increasing the congestion window by thousands of segments in a single
round-trip time.  Such an increase can easily result in thousands of
packets being dropped in one round-trip time.  This is often
counter-productive for the TCP flow itself, and is also hard on the
rest of the traffic sharing the congested link.  This note describes
Limited Slow-Start as an optional mechanism for limiting the number of
segments by which the congestion window is increased for one window of
data during slow-start, in order to improve performance for TCP
connections with large congestion windows.

This document is a product of the Transport Area Working Group of the

This memo defines an Experimental Protocol for the Internet community.
It does not specify an Internet standard of any kind.  Discussion and
suggestions for improvement are requested.  Distribution of this memo
is unlimited.

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USC/Information Sciences Institute


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