A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Proportional Rate Reduction for TCP
Author(s) : Matt Mathis
Nandita Dukkipati
Yuchung Cheng
Filename : draft-mathis-tcpm-proportional-rate-reduction-01.txt
Pages : 16
Date : 2011-07-11
This document describes an experimental algorithm, Proportional Rate
Reduction (PPR) and related algorithms 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
so small that the effective window falls below the target congestion
window chosen by the congestion control algorithm. 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
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. In addition we propose two slightly different algorithms
to bound the total window reduction due to all mechanisms, including
application stalls, the losses themselves and inhibit further window
reductions when possible.
A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-mathis-tcpm-proportional-rate-reduction-01.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-mathis-tcpm-proportional-rate-reduction-01.txt
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