The IESG has approved the following document:
- 'Proportional Rate Reduction'
  (draft-ietf-tcpm-prr-rfc6937bis-21.txt) as Proposed Standard

This document is the product of the TCP Maintenance and Minor Extensions
Working Group.

The IESG contact persons are Gorry Fairhurst and Mike Bishop.

A URL of this Internet-Draft is:
https://datatracker.ietf.org/doc/draft-ietf-tcpm-prr-rfc6937bis/




Technical Summary

This document is a product of the TCPM working group. PRR provides logic to 
regulate the amount of data sent by TCP or other transport protocols during 
fast recovery. PRR accurately regulates the actual flight size through recovery 
such that at the end of loss recovery. This will be as close as possible to the 
slow start threshold (ssthresh), as determined by the congestion control 
algorithm.

The WG notes that this has received feedback from the implementors of Linux and 
FreeBSD among others. There was a broad consensus in the WG on the document 
including from major OS implementers such as Linux, FreeBSD and Windows as the 
previous version of the algorithm has already been used by these OSes as the 
default. 

Working Group Summary

This draft specifies a congestion control algorithm during recovery period 
which is the updated version of RFC6317 published 12 years ago. The intention 
of the draft is to promote the specification to a proposed standard based on 
the experiences accumulated over the period. Sections 3 and 4 provide the 
rationale for why this update is needed to the current RFC for PRR. The 
intended status of the document is Proposed Standard as there is a strong 
consensus in the WG. Publication will obsolete RFC6937 as the new specification 
for PRR and will move the specification to the Standards Track. 

Personnel

   The Document Shepherd for this document is Yoshifumi Nishida. The
   Responsible Area Director is Gorry Fairhurst.

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