(m,k)-WFQ : Integrating (m,k)-Firm Real-Time Constraints into Guaranteed-Rate Networks
Identifieur interne : 004F92 ( Hal/Checkpoint ); précédent : 004F91; suivant : 004F93(m,k)-WFQ : Integrating (m,k)-Firm Real-Time Constraints into Guaranteed-Rate Networks
Auteurs : Anis Koubaa [France] ; Ye-Qiong Song [France]Source :
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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<hal api="V3"><titleStmt><title xml:lang="en">(m,k)-WFQ : Integrating (m,k)-Firm Real-Time Constraints into Guaranteed-Rate Networks</title>
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<surname>Koubaa</surname>
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<author role="aut"><persName><forename type="first">Ye-Qiong</forename>
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<date type="whenModified">2016-05-19 01:09:12</date>
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<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>
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<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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