A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the TCP Maintenance and Minor Extensions Working Group of the IETF.
Title : Proportional Rate Reduction for TCP
Author(s) : Matt Mathis
Nandita Dukkipati
Yuchung Cheng
Filename : draft-ietf-tcpm-proportional-rate-reduction-00.txt
Pages : 15
Date : 2011-10-24
This document describes an experimental algorithm, Proportional Rate
Reduction (PPR) to improve the accuracy of the amount of data sent by
TCP during loss recovery. Standard Congestion Control requires that
TCP and other protocols reduce their congestion window in response to
losses. This window reduction naturally occurs in the same round
trip as the data retransmissions to repair the losses, and is
implemented by choosing not to transmit any data in response to some
ACKs arriving from the receiver. Two widely deployed algorithms are
used to implement this window reduction: Fast Recovery and Rate
Halving. Both algorithms are needlessly fragile under a number of
conditions, particularly when there is a burst of losses that such
that the number of ACKs returning to the sender is small.
Proportional Rate Reduction avoids these excess window reductions
such that at the end of recovery the actual window size will be as
close as possible to ssthresh, the window size determined by the
congestion control algorithm. It is patterned after Rate Halving,
but using the fraction that is appropriate for target window chosen
by the congestion control algorithm.
A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-tcpm-proportional-rate-reduction-00.txt
Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
This Internet-Draft can be retrieved at:
ftp://ftp.ietf.org/internet-drafts/draft-ietf-tcpm-proportional-rate-reduction-00.txt
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