Dual-Queue Coupled Active Queue Management (AQM) for Low Latency, Low Loss, and Scalable Throughput (L4S)

Metadata

Publisher: IETF
Doc Type: Experimental
Pages: 52
Abstract: This specification defines a framework for coupling the Active Queue Management (AQM) algorithms in two queues intended for flows with different responses to congestion. This provides a way for the Internet to transition from the scaling problems of standard TCP-Reno-friendly ('Classic') congestion controls to the family of 'Scalable' congestion controls. These are designed for consistently very low queuing latency, very low congestion loss, and scaling of per-flow throughput by using Explicit Congestion Notification (ECN) in a modified way. Until the Coupled Dual Queue (DualQ), these Scalable L4S congestion controls could only be deployed where a clean-slate environment could be arranged, such as in private data centres. This specification first explains how a Coupled DualQ works. It then gives the normative requirements that are necessary for it to work well. All this is independent of which two AQMs are used, but pseudocode examples of specific AQMs are given in appendices.
Publication Date: 2023-01-01
Status Note: Experimental
DOI: 10.17487/RFC9332
Link: https://doi.org/10.17487/RFC9332
Author(s): Koen De Schepper
Bob Briscoe
Greg White
Keyword(s): Queuing Delay, One-way Delay, RTT, Jitter, Congestion Control, Congestion Avoidance, Quality Of Service, QoS, Quality of Experience, QoE, AQM, ECN, Pacing, Burstiness

Latest version of IETF RFC 9332

Document Versions — IETF RFC 9332

▶ IETF RFC 9332 (2023-01-01)

THIS DOC [ACTIVE] [LATEST VERSION]

Normative Reference(s)

IETF RFC 2119 [Active*]
IETF RFC 3168 [Active*]
IETF RFC 8311 [Active*]
IETF RFC 9331 [Active*]

Bibliographic Reference(s)

10.1109-90.251892 — FLOY1993 EXTERNAL
10.1109-INFCOM.2003.1208948 — MEDF EXTERNAL
10.1117-12.473021 — AQMmetrics EXTERNAL
10.1145-1111322.1111336 — Dukkipati06 EXTERNAL
10.1145-1851275.1851194 — Labovitz10 EXTERNAL
10.1145-1993744.1993753 — ADCTCP EXTERNAL
10.1145-2910017.2910633 — L4Sdemo16 EXTERNAL
10.1145-2999572.2999578 — PI2 EXTERNAL
10.1145-3366693 — CCcensus19 EXTERNAL
10.1145-3402413.3402419 — Boru20 EXTERNAL
10.48550-arXiv.1904.07044 — QDyn EXTERNAL
10.48550-arXiv.1904.07339 — CRED_Insights EXTERNAL
10.48550-arXiv.2107.01003 — BDPdata EXTERNAL
10.48550-arXiv.2209.01078 — L4Seval22 EXTERNAL
GITHUB.EricssonResearch.scream — SCReAM-L4S EXTERNAL
GITHUB.google.bbr — BBRv2 EXTERNAL
GITHUB.heistp.l4s-tests — Heist21 EXTERNAL
IETF.draft-briscoe-docsis-q-protection-06 — I-D.briscoe-docsis-q-protection EXTERNAL
IETF.draft-briscoe-iccrg-prague-congestion-control-01 — I-D.briscoe-iccrg-prague-congestion-control EXTERNAL
IETF.draft-briscoe-tsvwg-l4s-diffserv-02 — I-D.briscoe-tsvwg-l4s-diffserv EXTERNAL
IETF draft-cardwell-iccrg-bbr-congestion-control-02 [Active*]
IETF.draft-mathis-iccrg-relentless-tcp-00 — I-D.mathis-iccrg-relentless-tcp EXTERNAL
Nichols, K. and V. Jacobson, "Controlling Queue Delay", ACM Queue, Vol. 10, Issue 5, May 2012, <https://queue.acm.org/issuedetail.cfm?issue=2208917>. EXTERNAL
Willars, P., Wittenmark, E., Ronkainen, H., Östberg, C., Johansson, I., Strand, J., Lédl, P., and D. Schnieders, "Enabling time-critical applications over 5G with rate adaptation", Ericsson - Deutsche Telekom White Paper, BNEW-21:025455, May 2021, <https://www.ericsson.com/en/reports-and-papers/white-papers/enabling-time-critical-applications-over-5g-with-rate-adaptation>. EXTERNAL
Steen, H., "Destruction Testing: Ultra-Low Delay using Dual Queue Coupled Active Queue Management", Master's Thesis, Department of Informatics, University of Oslo, May 2017. EXTERNAL
Albisser, O., De Schepper, K., Briscoe, B., Tilmans, O., and H. Steen, "DUALPI2 - Low Latency, Low Loss and Scalable (L4S) AQM", Proceedings of Linux Netdev 0x13 , March 2019, <https://www.netdevconf.org/0x13/session.html?talk-DUALPI2-AQM>. EXTERNAL
Briscoe, B., De Schepper, K., Albisser, O., Misund, J., Tilmans, O., Kuehlewind, M., and A. Ahmed, "Implementing the 'TCP Prague' Requirements for L4S", Proceedings of Linux Netdev 0x13, March 2019, <https://www.netdevconf.org/0x13/session.html?talk-tcp-prague-l4s>. EXTERNAL
White, G., Sundaresan, K., and B. Briscoe, "Low Latency DOCSIS: Technology Overview", CableLabs White Paper, February 2019, <https://cablela.bs/low-latency-docsis-technology-overview-february-2019>. EXTERNAL
CableLabs, "DOCSIS 3.1 MAC and Upper Layer Protocols Interface Specification", CM-SP-MULPIv3.1, Data-Over-Cable Service Interface Specifications DOCSIS 3.1 Version I17 or later, January 2019, <https://specification-search.cablelabs.com/CM-SP-MULPIv3>. EXTERNAL
Floyd, S., Gummadi, R., and S. Shenker, "Adaptive RED: An Algorithm for Increasing the Robustness of RED's Active Queue Management", ACIRI Technical Report 301, August 2001, <https://www.icsi.berkeley.edu/icsi/node/2032>. EXTERNAL
IETF RFC 970 [Active*]
IETF RFC 2914 [Active*]
IETF RFC 3246 [Active*]
IETF RFC 3649 [Active*]
IETF RFC 5033 [Superseded*]
IETF RFC 5348 [Active*]
IETF RFC 5681 [Active*]
IETF RFC 5706 [Active*]
IETF RFC 7567 [Active*]
IETF RFC 8033 [Active*]
IETF RFC 8034 [Active*]
IETF RFC 8174 [Active*]
IETF RFC 8257 [Active*]
IETF RFC 8290 [Active*]
RFC8298 — RFC8298 EXTERNAL
IETF RFC 8312 [Superseded*]
RFC8404 — RFC8404 EXTERNAL
IETF RFC 9000 [Active*]
IETF RFC 9330 [Active*]

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IETF RFC 9332, Dual-Queue Coupled Active Queue Management (AQM) for Low Latency, Low Loss, and Scalable Throughput (L4S). Available at https://doi.org/10.17487/RFC9332

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IETF RFC 9332, Dual-Queue Coupled Active Queue Management (AQM) for Low Latency, Low Loss, and Scalable Throughput (L4S). Available at https://doi.org/10.17487/RFC9332

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IETF RFC 9332, Dual-Queue Coupled Active Queue Management (AQM) for Low Latency, Low Loss, and Scalable Throughput (L4S). Available at https://doi.org/10.17487/RFC9332

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<span class="citation"><cite>IETF RFC 9332</cite>, Dual-Queue Coupled Active Queue Management (AQM) for Low Latency, Low Loss, and Scalable Throughput (L4S). Available at <a href="https://doi.org/10.17487/RFC9332" target="_blank" rel="noopener">https://doi.org/10.17487/RFC9332</a></span>

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IETF RFC 9332, Dual-Queue Coupled Active Queue Management (AQM) for Low Latency, Low Loss, and Scalable Throughput (L4S)
doi: 10.17487/RFC9332
url: https://doi.org/10.17487/RFC9332

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<li>
<cite id="bib-rfc9332">IETF RFC 9332</cite>, Dual-Queue Coupled Active Queue Management (AQM) for Low Latency, Low Loss, and Scalable Throughput (L4S)
<span class="doi">10.17487/RFC9332</span>
</li>

Referenced By

IETF RFC 9330 [Active*]
IETF RFC 9331 [Active*]
IETF RFC 9522 [Active*]
IETF RFC 9743 [Active*]