Loko: Predictable latency in small networks

Amaury Van Bemten, Nemanja Derić, Johannes Zerwas, Andreas Blenk, Stefan Schmid, Wolfgang Kellerer

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

11 Scopus citations

Abstract

A predictable network performance is mission critical for many applications and yet hard to provide due to difficulties in modeling the behavior of the increasingly complex network equipment. This paper studies the problem of providing deterministic latency guarantees in small networks based on low-capacity hardware (e.g., in-cabin and industrial networks): such networks are of increasing importance, need to meet stringent performance requirements, but have hardly been explored so far. Our main contribution is the design, implementation, and evaluation of Loko, a system which provides predictable latency guarantees in programmable networks using low-cost hardware. Loko relies on a novel measurement-based methodology and uses deterministic network calculus to derive a reliable performance model of a given switch. To this end, we also show that state-of-the-art models in the literature like QJump and Silo fall short to model the behavior of such switches, due to incorrect architectural and performance assumptions. As a case study, we implement Loko for the Zodiac FX switch. Our experiments are encouraging: we find that the derived models are indeed accurate, allowing Loko to provide deterministic end-to-end guarantees with low-cost programmable devices.

Original languageEnglish
Title of host publicationCoNEXT 2019 - Proceedings of the 15th International Conference on Emerging Networking Experiments and Technologies
PublisherAssociation for Computing Machinery, Inc
Pages355-369
Number of pages15
ISBN (Electronic)9781450369985
DOIs
StatePublished - 3 Dec 2019
Event15th ACM International Conference on Emerging Networking Experiments and Technologies, CoNEXT 2019 - Orlando, United States
Duration: 9 Dec 201912 Dec 2019

Publication series

NameCoNEXT 2019 - Proceedings of the 15th International Conference on Emerging Networking Experiments and Technologies

Conference

Conference15th ACM International Conference on Emerging Networking Experiments and Technologies, CoNEXT 2019
Country/TerritoryUnited States
CityOrlando
Period9/12/1912/12/19

Keywords

  • Guarantees
  • Latency
  • Low-cost
  • Network calculus
  • Network measurements
  • Predictability
  • Programmable networks
  • Zodiac FX

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