The IESG has approved the following document: - 'Proportional Rate Reduction for TCP' (draft-ietf-tcpm-proportional-rate-reduction-04.txt) as Experimental RFC This document is the product of the TCP Maintenance and Minor Extensions Working Group. The IESG contact persons are Wesley Eddy and Martin Stiemerling. A URL of this Internet Draft is: http://datatracker.ietf.org/doc/draft-ietf-tcpm-proportional-rate-reduction/ Technical Summary This document describes an algorithm to improve the accuracy of the amount of data sent by TCP during loss recovery. The existing TCP recovery algorithms can make excess window adjustments in some situations, such as in the presence of heavy losses, and may result in abrupt TCP behavior in the form of packet bursts or increased risk of timeouts. Proportional Rate Reduction aims to minimize the needed window adjustments, to result in more stable TCP congestion control behavior in the presence of losses. Working Group Summary The document was adopted as Experimental TCPM working group item by clear working group consensus, and no opinions against it have been raised during its progress or in the working group last call. Document Quality The algorithm specified in the document has been implemented in Linux and integrated to the main kernel distribution. The algorithm has also been evaluated through measurements, and the evaluation results reported in a paper published in the IMC'11 conference. Different versions of the document have been thoroughly reviewed by TCPM working group members. Personnel Document Shepherd is Pasi Sarolahti <pasi.sarolahti@iki.fi>. Responsible Area Director is Wesley Eddy <wes@mti-systems.com>. RFC Editor Note (1) Please change the Abstract to: This document describes an experimental Proportional Rate Reduction (PPR) algorithm as an alternative to the widely deployed Fast Recovery and Rate Halving algorithms. These algorithms determine the amount of data sent by TCP during loss recovery. PRR minimizes excess window adjustments and the actual window size at the end of recovery will be as close as possible to the ssthresh determined by the congestion control algorithm. (2) Please change all occurrences of "PPR" to "PRR". (3) Please change all occurrences of "PRR+SSRB" to "PRR-SSRB" and all occurrences of "PRR+CRB" to "PRR-CRB" (4) On Page 3, please change: "slight difference" to "slight differences" and "discussions algorithms" to "discussions of algorithms" and "of RFC 3517 we are" to "of RFC 3517, we are" (5) On Page 11, please change: "Bound in very" to "Bound is very"
