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DOI: 10.4230/OASIcs.AEiC.2026.6

Task-Based Constant Bandwidth Server in the Zephyr Operating System

Authors: Alexander Paschoaletto, Paulo Baltarejo Sousa, Luis Miguel Pinho, and Tiago Carvalho

Published in: OASIcs, Volume 143, 30th Ada-Europe International Conference on Reliable Software Technologies (AEiC 2026)

Abstract

The Constant Bandwidth Server (CBS) is a widely used method to support aperiodic soft real-time tasks in a system that uses dynamic scheduling algorithms, such as Earliest Deadline First (EDF), while providing end-to-end temporal guarantees through bandwidth reservation. We have recently proposed an approach to integrate CBS with the open-source real-time operating system, Zephyr, which involves developing CBS as a separate kernel component that can be shared by multiple execution contexts. In this paper, we propose an alternative approach, which provides each task with a dedicated CBS instance, which enables fine-grained control over task execution. The paper also presents a richer support for EDF scheduling in Zephyr, which is used to support the Task-Based CBS. The proposed method is validated through test cases, demonstrating its efficiency in supporting aperiodic real-time tasks with bandwidth constraints in Zephyr.

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Alexander Paschoaletto, Paulo Baltarejo Sousa, Luis Miguel Pinho, and Tiago Carvalho. Task-Based Constant Bandwidth Server in the Zephyr Operating System. In 30th Ada-Europe International Conference on Reliable Software Technologies (AEiC 2026). Open Access Series in Informatics (OASIcs), Volume 143, pp. 6:1-6:16, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2026)

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@InProceedings{paschoaletto_et_al:OASIcs.AEiC.2026.6,
  author =	{Paschoaletto, Alexander and Sousa, Paulo Baltarejo and Pinho, Luis Miguel and Carvalho, Tiago},
  title =	{{Task-Based Constant Bandwidth Server in the Zephyr Operating System}},
  booktitle =	{30th Ada-Europe International Conference on Reliable Software Technologies (AEiC 2026)},
  pages =	{6:1--6:16},
  series =	{Open Access Series in Informatics (OASIcs)},
  ISBN =	{978-3-95977-425-3},
  ISSN =	{2190-6807},
  year =	{2026},
  volume =	{143},
  editor =	{Filieri, Antonio and Backeman, Peter},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.AEiC.2026.6},
  URN =		{urn:nbn:de:0030-drops-259246},
  doi =		{10.4230/OASIcs.AEiC.2026.6},
  annote =	{Keywords: Constant Bandwidth Server, Zephyr Operating System}
}

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Task-Based Constant Bandwidth Server in the Zephyr Operating System

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