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Acknowledgments

The authors would like to thank the following individuals and organizations for their contributions to this work and the development of the Proportional Rate Reduction algorithm:

This document is based on RFC 6937, and we thank all those who contributed to that earlier work.

The PRR algorithm described in this document has benefited from extensive implementation experience in multiple TCP stacks, including Linux, FreeBSD, and others. We are grateful to the implementers and operators who deployed PRR and provided valuable feedback based on real-world experience.

We would like to acknowledge the contributions of the TCP Maintenance and Minor Extensions (tcpm) Working Group for their careful review and thoughtful feedback on this specification.

Special thanks to:

  • Van Jacobson for the foundational work on packet conservation principles that inspired PRR
  • Sally Floyd for her pioneering work on TCP congestion control
  • The Linux TCP development community for the first widely deployed implementation of PRR in 2011
  • Google's Content Delivery Network (CDN) team for extensive experimentation with the SafeACK heuristic and PRR variants

We are grateful to the researchers who conducted measurement studies of PRR performance, particularly those who contributed to the IMC 2011 paper that provided empirical validation of the algorithm.

The development of the SafeACK heuristic was motivated by the discovery of challenging traffic policing scenarios. We thank:

  • Tobias Flach and co-authors for their Internet-wide analysis of traffic policing that revealed critical edge cases
  • The operators and network administrators who shared data and insights about traffic policing behavior

We acknowledge the IETF community for promoting open standards and the RFC Editor for their meticulous work in preparing this document for publication.

Finally, we thank all the reviewers who provided detailed comments and suggestions that improved the clarity and technical accuracy of this specification, including members of the TCPM Working Group and the IETF community at large.

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