[tsvwg] New SCE-related I-Ds
Jonathan Morton <chromatix99@gmail.com> Wed, 03 July 2019 09:34 UTC
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From: Jonathan Morton <chromatix99@gmail.com>
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Date: Wed, 03 Jul 2019 12:34:44 +0300
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Subject: [tsvwg] New SCE-related I-Ds
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We've just submitted three new Internet Drafts related to our ongoing work on SCE. Rolling these up into a single notification… > Name: draft-morton-tsvwg-sce > Revision: 00 > Title: The Some Congestion Experienced ECN Codepoint > Document date: 2019-07-03 > Group: Individual Submission > Pages: 9 > URL: https://www.ietf.org/internet-drafts/draft-morton-tsvwg-sce-00.txt > Status: https://datatracker.ietf.org/doc/draft-morton-tsvwg-sce/ > Htmlized: https://tools.ietf.org/html/draft-morton-tsvwg-sce-00 > Htmlized: https://datatracker.ietf.org/doc/html/draft-morton-tsvwg-sce > > > Abstract: > This memo reclassifies ECT(1) to be an early notification of > congestion on ECT(0) marked packets, which can be used by AQM > algorithms and transports as an earlier signal of congestion than CE. > It is a simple, transparent, and backward compatible upgrade to > existing IETF-approved AQMs, RFC3168, and nearly all congestion > control algorithms. Although this appears to be a -00, that's because it was submitted under a new filename to better match IETF conventions. It is a major revision of draft-morton-taht-tsvwg-sce-00, addressing in particular the interaction with single-queue AQMs supporting SCE, and also bringing the text into line with the current state of our reference implementation. > Name: draft-morton-tsvwg-lightweight-fair-queueing > Revision: 00 > Title: Lightweight Fair Queueing > Document date: 2019-07-03 > Group: Individual Submission > Pages: 10 > URL: https://www.ietf.org/internet-drafts/draft-morton-tsvwg-lightweight-fair-queueing-00.txt > Status: https://datatracker.ietf.org/doc/draft-morton-tsvwg-lightweight-fair-queueing/ > Htmlized: https://tools.ietf.org/html/draft-morton-tsvwg-lightweight-fair-queueing-00 > Htmlized: https://datatracker.ietf.org/doc/html/draft-morton-tsvwg-lightweight-fair-queueing > > > Abstract: > This note presents Lightweight Fair Queueing (LFQ), a fair queueing > algorithm with a small code footprint, low memory requirements, no > multiply operations, only two physical queues, and only one set of > AQM state. LFQ provides throughput fairness, sparse flow > prioritization and ordering guarantees, making it suitable for a > mixture of traffic flow types. Although we found that SCE can be made to work acceptably well with single-queue AQMs, we felt that a middle ground between single-queue AQM and full FQ was relevant to high-capacity networks, in which a dual-FIFO queue discipline seems to be the maximum acceptable. We therefore developed LFQ to approach the favourable flow-isolation performance of DRR++ with considerably reduced implementation complexity. In turn, this allows transports employing high-fidelity ECN methods to coexist with conventional transports on the same link, without requiring an explicit identifier, nor heuristic fallbacks at the endpoints. Presently we have a working offline simulation of LFQ, and we hope to have a practical implementation for real-network experiments by Montreal. Ideas for efficiently implementing multi-level fairness are also being explored, and may appear in a later version of this draft. > Name: draft-heist-tsvwg-sce-one-and-two-flow-tests > Revision: 00 > Title: Some Congestion Experienced One and Two-Flow Tests > Document date: 2019-07-03 > Group: Individual Submission > Pages: 66 > URL: https://www.ietf.org/internet-drafts/draft-heist-tsvwg-sce-one-and-two-flow-tests-00.txt > Status: https://datatracker.ietf.org/doc/draft-heist-tsvwg-sce-one-and-two-flow-tests/ > Htmlized: https://tools.ietf.org/html/draft-heist-tsvwg-sce-one-and-two-flow-tests-00 > Htmlized: https://datatracker.ietf.org/doc/html/draft-heist-tsvwg-sce-one-and-two-flow-tests > > > Abstract: > This note presents one and two-flow test results for the SCE (Some > Congestion Experienced) reference implementation. These tests are > not intended to be a comprehensive real-world evaluation of SCE, but > an illustration of SCE's influence on basic TCP metrics in a > controlled environment. To demonstrate our progress, we are also publishing initial test results from our reference implementation. Constructive commentary is welcomed. - Jonathan Morton
- [tsvwg] New SCE-related I-Ds Jonathan Morton