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(m,k)-WFQ : Integrating (m,k)-Firm Real-Time Constraints into Guaranteed-Rate Networks

Anis Koubaa 1 Ye-Qiong Song 1
1 TRIO - Real time and interoperability
INRIA Lorraine, LORIA - Laboratoire Lorrain de Recherche en Informatique et ses Applications
Abstract : Guaranteed-Rate (GR) servers, such as Weighted Fair Queueing (WFQ) and its variants, have been widely used to give mainly bandwidth guarantees and consequently delay guarantees for real-time flows provided that their arrivals are upper-bounded. Problems may arise if a bursty traffic with a small service share needs a specific short delay. In fact, the higher the service share is, the lower the delay the flow gets. However, WFQ and its variants are share-driven servers and no temporal constraint is considered in the scheduling process. Therefore, having in mind that real-time streams could tolerate some deadline misses according to their (m,k)-firm constraints, we propose a new scheduling technique called (m,k)-WFQ that extends WFQ to also consider (m,k)-firm temporal requirement. Analytic expressions using Network Calculus theory are derived to give deterministic upper bound on delay provided by the (m,k)-WFQ scheduler. Theoretical Results and simulations show lower average and maximum delays provided by the proposed scheduling algorithm, without much degrading bandwidth fairness.
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https://hal.inria.fr/inria-00108118
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Submitted on : Thursday, October 19, 2006 - 3:58:32 PM
Last modification on : Tuesday, March 16, 2021 - 5:42:05 PM
Long-term archiving on: : Wednesday, March 29, 2017 - 1:35:04 PM

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  • HAL Id : inria-00108118, version 1

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Anis Koubaa, Ye-Qiong Song. (m,k)-WFQ : Integrating (m,k)-Firm Real-Time Constraints into Guaranteed-Rate Networks. Conference on Real-Time Systems - RTS Embedded Systems 2004, 2004, Paris/France. ⟨inria-00108118⟩

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