2026-09-18T20:59:23Z https://drops.dagstuhl.de/oai

oai:drops-oai.dagstuhl.de:25924 2026-09-05T19:32:50Z ddc:004 open_access

Task-Based Constant Bandwidth Server in the Zephyr Operating System Paschoaletto, Alexander Sousa, Paulo Baltarejo Pinho, Luis Miguel Carvalho, Tiago Constant Bandwidth Server Zephyr Operating System 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. Schloss Dagstuhl – Leibniz-Zentrum für Informatik Alexander Paschoaletto and Paulo Baltarejo Sousa and Luis Miguel Pinho and Tiago Carvalho 2026 Is Part Of OASIcs, Volume 143, 30th Ada-Europe International Conference on Reliable Software Technologies (AEiC 2026) InProceedings Text doc-type:ResearchArticle publishedVersion application/pdf doi:10.4230/OASIcs.AEiC.2026.6 urn:nbn:de:0030-drops-259246 https://drops.dagstuhl.de/entities/document/10.4230/OASIcs.AEiC.2026.6 eng https://creativecommons.org/licenses/by/4.0/legalcode