A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Detection and Quantification of Packet Reordering with TCP
Authors : Alexander Zimmermann
Lennart Schulte
Carsten Wolff
Arnd Hannemann
Filename : draft-zimmermann-tcpm-reordering-detection-02.txt
Pages : 22
Date : 2014-11-10
Abstract:
This document specifies an algorithm for the detection and
quantification of packet reordering for TCP. In the absence of
explicit congestion notification from the network, TCP uses only
packet loss as an indication of congestion. One of the signals TCP
uses to determine loss is the arrival of three duplicate
acknowledgments. However, this heuristic is not always correct,
notably in the case when paths reorder packets. This results in
degraded performance.
The algorithm for the detection and quantification of reordering in
this document uses information gathered from the TCP Timestamps
Option, the TCP SACK Option and its DSACK extension. When a
reordering event is detected, the algorithm calculates a reordering
extent by determining the number of segments the reordered segment
was late with respect to its position in the sequence number space.
Additionally, the algorithm computes a second reordering extent that
is relative to the amount of outstanding data and thus provides a
better estimation of the reordering delay when other sender state
changes.
The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-zimmermann-tcpm-reordering-detection/
There's also a htmlized version available at:
http://tools.ietf.org/html/draft-zimmermann-tcpm-reordering-detection-02
A diff from the previous version is available at:
http://www.ietf.org/rfcdiff?url2=draft-zimmermann-tcpm-reordering-detection-02
Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.
Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
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