research-article

PI²: A Linearized AQM for both Classic and Scalable TCP

Authors:

Koen De Schepper,

Olga Bondarenko,

Bob BriscoeAuthors Info & Claims

CoNEXT '16: Proceedings of the 12th International on Conference on emerging Networking EXperiments and Technologies

Pages 105 - 119

https://doi.org/10.1145/2999572.2999578

Published: 06 December 2016 Publication History

Abstract

This paper concerns the use of Active Queue Management (AQM) to reduce queuing delay. It offers insight into why it has proved hard for a Proportional Integral (PI) controller to remain both responsive and stable while controlling `Classic' TCP flows, such as TCP Reno and Cubic. Due to their non-linearity, the controller's adjustments have to be smaller when the target drop probability is lower. The PI Enhanced (PIE) algorithm attempts to solve this problem by scaling down the adjustments of the controller using a look-up table. Instead, we control an internal variable that is by definition linearly proportional to the load, then post-process it into the required Classic drop probability---in fact we show that the output simply needs to be squared. This allows tighter control, giving responsiveness and stability better or no worse than PIE achieves, but without all its corrective heuristics.

Additionally, with suitable packet classification, it becomes simple to extend this PI2 AQM to support coexistence between Classic and Scalable congestion controls in the public Internet. Unlike a Classic congestion control, a Scalable congestion control ensures sufficient feedback at any flow rate, an example being Data Centre TCP (DCTCP). A Scalable control is linear, so we can use the internal variable directly without any squaring, by omitting the post-processing stage.

We implemented this PI2 AQM as a Linux qdisc to extensively test our claims using Classic and Scalable TCPs.

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de Almeida LMatos GPasquini RPapagianni CVerdi F(2022)iREDProceedings of the 18th International Conference on Network and Service Management10.5555/3581644.3581710(1-9)Online publication date: 31-Oct-2022
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Hassan SRufai AOgunlere SAlao OOgundele LAgbaje MAdegbenjo AKuyoro S(2022)IRED: An Improved Active Queue Management AlgorithmJournal of Computer Science10.3844/jcssp.2022.130.13718:3(130-137)Online publication date: 1-Mar-2022
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Index Terms

PI²: A Linearized AQM for both Classic and Scalable TCP
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cover image ACM Conferences

CoNEXT '16: Proceedings of the 12th International on Conference on emerging Networking EXperiments and Technologies

December 2016

524 pages

ISBN:9781450342926

DOI:10.1145/2999572

General Chairs:
Athina Markopoulou
University of California, Irvine, USA
,
Michalis Faloutsos
University of California, Riverside, USA
,
Program Chairs:
Vyas Sekar
Carnegie Mellon University, USA
,
Dejan Kostic
KTH Royal Institute of Technology, Sweden

Copyright © 2016 ACM.

Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for components of this work owned by others than the author(s) must be honored. Abstracting with credit is permitted. To copy otherwise, or republish, to post on servers or to redistribute to lists, requires prior specific permission and/or a fee. Request permissions from [email protected].

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Published: 06 December 2016

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CoNEXT '16: The 12th International Conference on emerging Networking EXperiments and Technologies

December 12 - 15, 2016

California, Irvine, USA

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Overall Acceptance Rate 198 of 789 submissions, 25%

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https://doi.org/10.1007/978-3-031-52872-9_2
de Almeida LMatos GPasquini RPapagianni CVerdi F(2022)iREDProceedings of the 18th International Conference on Network and Service Management10.5555/3581644.3581710(1-9)Online publication date: 31-Oct-2022
https://dl.acm.org/doi/10.5555/3581644.3581710
Hassan SRufai AOgunlere SAlao OOgundele LAgbaje MAdegbenjo AKuyoro S(2022)IRED: An Improved Active Queue Management AlgorithmJournal of Computer Science10.3844/jcssp.2022.130.13718:3(130-137)Online publication date: 1-Mar-2022
https://doi.org/10.3844/jcssp.2022.130.137
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BoruOljira DGrinnemo KBrunstrom ATaheri J(2020)Validating the Sharing Behavior and Latency Characteristics of the L4S ArchitectureACM SIGCOMM Computer Communication Review10.1145/3402413.340241950:2(37-44)Online publication date: 23-May-2020
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