Creative Commons Attribution 3.0 Unported license
In a distributed computing environment, guaranteeing the hard deadline for real-time messages is essential to ensure schedulability of real-time tasks. Since capabilities of the shared resources for transmission are limited, e.g., the buffer size is limited on network devices, it becomes a challenge to design an effective and feasible resource sharing policy based on both the demand of real-time packet transmissions and the limitation of resource capabilities. We address this challenge in two cooperative mechanisms. First, we design a static routing algorithm to find forwarding paths for packets to guarantee their hard deadlines. The routing algorithm employs a validation-based backtracking procedure capable of deriving the demand of a set of real-time packets on each shared network device, and it checks whether this demand can be met on the device. Second, we design a packet scheduler that runs on network devices to transmit messages according to our routing requirements. We implement these mechanisms on virtual software-defined network (SDN) switches and evaluate them on real hardware in a local cluster to demonstrate the feasibility and effectiveness of our routing algorithm and packet scheduler.
@InProceedings{qian_et_al:LIPIcs.ECRTS.2017.25,
author = {Qian, Tao and Mueller, Frank and Xin, Yufeng},
title = {{A Linux Real-Time Packet Scheduler for Reliable Static SDN Routing}},
booktitle = {29th Euromicro Conference on Real-Time Systems (ECRTS 2017)},
pages = {25:1--25:22},
series = {Leibniz International Proceedings in Informatics (LIPIcs)},
ISBN = {978-3-95977-037-8},
ISSN = {1868-8969},
year = {2017},
volume = {76},
editor = {Bertogna, Marko},
publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
address = {Dagstuhl, Germany},
URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ECRTS.2017.25},
URN = {urn:nbn:de:0030-drops-71707},
doi = {10.4230/LIPIcs.ECRTS.2017.25},
annote = {Keywords: Real-time Networks, Packet Scheduling, Deadline Guarantee}
}