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RFC 9406: HyStart++: Modified Slow Start for TCP

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

This document describes HyStart++, a simple modification to the slow start phase of congestion control algorithms. Slow start can overshoot the ideal send rate in many cases, causing high packet loss and poor performance. HyStart++ uses increase in round-trip delay as a heuristic to find an exit point before possible overshoot. It also adds a mitigation to prevent jitter from causing premature slow start exit.

Document record

Document ID
RFC9406
Published
May 2023
Authors
P. Balasubramanian; Y. Huang; M. Olson
Status
PROPOSED STANDARD
Stream
IETF
Area
wit
Pages
9
Also known as
—

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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.

Last checked against the RFC Editor index on . RFCs are never revised after publication; changes are issued as new documents.

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canonical URL: /rfc/9406-hystart-modified-slow-start-for-tcp