envoyproxy/envoy

quic: add a config knob for congestion control algorithm

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#20,109 opened on Feb 24, 2022

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area/quicenhancementhelp wanted

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Description

Right now the default is BBR and enabled by hard coding a QUICHE reloadable flag in #19349 quic: enable BBR congestion control. But we want it to be configurable, especially distinguishable between upstream and downstream. As discussed with @ggreenway, the preferred default value should be CUBIC, in consideration of https://en.m.wikipedia.org/wiki/TCP_congestion_control#TCP_BBR.

Contributor guide

Research direction
Investigate the QUICHE reloadable flag mechanism and add a new configuration option in Envoy's QUIC config to allow selecting congestion control algorithm (e.g., CUBIC or BBR). Ensure it distinguishes between upstream and downstream connections.
Tech stack
cpp
Domain
backendapi
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
C++Git
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40