This repository hosts various resources about L4S, and the existing implementations.

See the general L4S Landing Page for various resources around L4S.


All various components required to test L4S are under a common Github umbrella. In particular:

Prague requirements Compliance

The IETF draft-ietf-tsvwg-ecn-l4s-id contains a list of requirements an L4S congestion control should comply with. The following template document provides a checklist to the different normative paragraphs listed in draft-ietf-tsvwg-ecn-l4s-id-12:

This list of requirements is still being discussed and finetuned. Consensus on feasibility, performance and usefulness needs to be reached. The following contributions, grouped in (partial) available implementations and potential/planned implementations will be taken into account for that purpose.

Currently existing implementations:

Planned/potential implementations:

Consolidated view including private contributions (updated v2): Prague_requirements_consolidated.pdf


TCP Prague controlled RTT dependence

ECT(1) tests

DualPI2 overload experiments

ICCRG experiments (21/11/2020)

PIE, DualPI2 and CoDel overload comparison