[tsvwg] I-D Action: draft-ietf-tsvwg-aqm-dualq-coupled-09.txt
internet-drafts@ietf.org Wed, 03 July 2019 22:23 UTC
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Subject: [tsvwg] I-D Action: draft-ietf-tsvwg-aqm-dualq-coupled-09.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Transport Area Working Group WG of the IETF. Title : DualQ Coupled AQMs for Low Latency, Low Loss and Scalable Throughput (L4S) Authors : Koen De Schepper Bob Briscoe Greg White Filename : draft-ietf-tsvwg-aqm-dualq-coupled-09.txt Pages : 49 Date : 2019-07-03 Abstract: The Low Latency Low Loss Scalable Throughput (L4S) architecture allows data flows over the public Internet to predictably achieve ultra-low queuing latency, generally zero congestion loss and scaling of per-flow throughput without the problems of traditional TCP. To achieve this, L4S data flows have to use one of the family of 'Scalable' congestion controls (Data Centre TCP and TCP Prague are examples) and a form of Explicit Congestion Notification (ECN) with modified behaviour. However, until now, Scalable congestion controls did not co-exist with existing TCP Reno/Cubic traffic --- Scalable controls are so aggressive that 'Classic' TCP algorithms drive themselves to a small capacity share. Therefore, until now, L4S controls could only be deployed where a clean-slate environment could be arranged, such as in private data centres (hence the name DCTCP). This specification defines `DualQ Coupled Active Queue Management (AQM)', which enables these Scalable congestion controls to safely co-exist with Classic Internet traffic. The Coupled AQM ensures that competing Scalable and Classic flows run at about the same rate. It achieves this indirectly, without having to inspect transport layer flow identifiers, When tested in a residential broadband setting, DCTCP also achieves sub-millisecond average queuing delay and zero congestion loss under a wide range of mixes of DCTCP and `Classic' broadband Internet traffic, without compromising the performance of the Classic traffic. The solution also reduces network complexity and requires no configuration for the public Internet. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-tsvwg-aqm-dualq-coupled/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-tsvwg-aqm-dualq-coupled-09 https://datatracker.ietf.org/doc/html/draft-ietf-tsvwg-aqm-dualq-coupled-09 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-tsvwg-aqm-dualq-coupled-09 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/
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