RFC 9937: Proportional Rate Reduction (PRR)
Recent RFCs 2025-12-19
Summary:
This document specifies a Standards Track version of the Proportional
Rate Reduction (PRR) algorithm that obsoletes the Experimental
version described in RFC 6937. PRR regulates 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 recovery it will be as close as possible to the
slow start threshold (ssthresh), as determined by the congestion
control algorithm.