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  Improving fixed priority schedulability with dynamic priority as secondary criterion
 
 
Titel: Improving fixed priority schedulability with dynamic priority as secondary criterion
Auteur: Martin, Steven
Minet, Pascale
George, Laurent
Verschenen in: Journal of embedded computing
Paginering: Jaargang 2 (2008) nr. 3-4 pagina's 327-345
Jaar: 2008-11-18
Inhoud: In this paper, we focus on a non-preemptive scheduling, combining fixed priorities and dynamic priorities on a uniprocessor. This scheduling is called FP/DP. Results presented in this paper can be applied indifferently to tasks and flows. With any flow are associated a fixed priority denoting the importance degree of the flow and a temporal parameter, used to compute the dynamic priority. A packet can be transmitted only if there is no packet having a higher fixed priority and if this packet has the highest dynamic priority among all packets having its fixed priority. We are interested in the worst case response time of a sporadic flow set scheduled FP/DP and establish new results improving the classical FP analysis. Two examples of FP/DP scheduling are considered: FP/FIFO and FP/EDF. We show that FP/EDF dominates FP/FIFO when packets sharing the same fixed priority have the same processing time.
Uitgever: IOS Press
Bronbestand: Elektronische Wetenschappelijke Tijdschriften
 
 

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