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RFC 9937: Proportional Rate Reduction (PRR)

In plain English — editorial summary, not part of the RFC

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.

Document record

Document ID
RFC9937
Published
December 2025
Authors
M. Mathis; N. Cardwell; Y. Cheng; N. Dukkipati
Status
PROPOSED STANDARD
Stream
IETF
Area
wit
Pages
20
Also known as
—
Obsoletes:
RFC 6937

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The document record above — title, authors, date, status, stream, area, relationships, DOI and errata — is imported verbatim from the public RFC Editor index. The “in plain English” section is editorial: written by The metasystema editorial team, not part of the RFC. Where the two differ, the RFC text governs.

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