(m,k)-WFQ : Integrating (m,k)-Firm Real-Time Constraints into Guaranteed-Rate Networks
Identifieur interne : 000051 ( Hal/Corpus ); précédent : 000050; suivant : 000052(m,k)-WFQ : Integrating (m,k)-Firm Real-Time Constraints into Guaranteed-Rate Networks
Auteurs : Anis Koubaa ; Ye-Qiong SongSource :
English descriptors
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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<front><div type="abstract" xml:lang="en">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.</div>
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<idno type="stamp" n="INPL">Institut National Polytechnique de Lorraine</idno>
<idno type="stamp" n="LORIA2">Publications du LORIA</idno>
<idno type="stamp" n="INRIA-NANCY-GRAND-EST">INRIA Nancy - Grand Est</idno>
<idno type="stamp" n="LORIA-NSS" p="LORIA">Réseaux, systèmes et services</idno>
<idno type="stamp" n="LORIA">LORIA - Laboratoire Lorrain de Recherche en Informatique et ses Applications</idno>
<idno type="stamp" n="UNIV-LORRAINE">Université de Lorraine</idno>
<idno type="stamp" n="INRIA-LORRAINE">INRIA Nancy - Grand Est</idno>
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<sourceDesc><biblStruct><analytic><title xml:lang="en">(m,k)-WFQ : Integrating (m,k)-Firm Real-Time Constraints into Guaranteed-Rate Networks</title>
<author role="aut"><persName><forename type="first">Anis</forename>
<surname>Koubaa</surname>
</persName>
<email>akoubaa@loria.fr</email>
<idno type="halAuthorId">131241</idno>
<orgName ref="#struct-364480"></orgName>
<affiliation ref="#struct-2406"></affiliation>
</author>
<author role="aut"><persName><forename type="first">Ye-Qiong</forename>
<surname>Song</surname>
</persName>
<idno type="halAuthorId">129569</idno>
<orgName ref="#struct-364475"></orgName>
<affiliation ref="#struct-2406"></affiliation>
</author>
</analytic>
<monogr><idno type="localRef">A04-R-214 || koubaa04c</idno>
<meeting><title>Conference on Real-Time Systems - RTS Embedded Systems 2004</title>
<date type="start">2004</date>
<settlement>Paris/France</settlement>
</meeting>
<imprint><date type="datePub">2004</date>
</imprint>
</monogr>
</biblStruct>
</sourceDesc>
<profileDesc><langUsage><language ident="en">English</language>
</langUsage>
<textClass><keywords scheme="author"><term xml:lang="en">Bandwidth Guarantee</term>
<term xml:lang="en">(m</term>
<term xml:lang="en">k)-firm</term>
<term xml:lang="en">Network Calculus</term>
<term xml:lang="en">Delay Guarantees</term>
<term xml:lang="en">WFQ</term>
<term xml:lang="en">borne sur le délai</term>
</keywords>
<classCode scheme="halDomain" n="info.info-oh">Computer Science [cs]/Other [cs.OH]</classCode>
<classCode scheme="halTypology" n="COMM">Conference papers</classCode>
</textClass>
<abstract xml:lang="en">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.</abstract>
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