Technical Summary
This document describes HyStart++, a simple modification to the slow start phase of congestion control algorithms. Traditional slow start can overshoot the ideal send rate in many cases, causing high packet loss and poor performance. HyStart++ uses a delay increase heuristic to find an exit point before possible overshoot. It also adds a mitigation to prevent jitter from causing premature slow start exit.
Working Group Summary
The document has broad agreement, in particular from TCP implementers. There was no controversy.
Document Quality
There are implementations for the TCP stacks in FreeBSD, Linux, and Windows,
and a QUIC implementations Quiche from CloudFlare and s2n-quic from AWS.?
Personnel
The document shepherd is Michael Tuexen. The AD is Martin Duke.