Universidad de Castilla-La Mancha
 
Departamento de Sistemas Informáticos





 
Technical Report
 
Código: DIAB-04-12-2
Fecha Publicación: 23-12-2004
Título: A Strategy to Reduce the Delay and Implementation Cost of QoS Support in Clusters
Detalle: Present-day cluster proposals providing hardware support for QoS use 16 or even more virtual channels (VCs) for the purpose. However, most implementations do not offer so many VCs because it is too expensive in chip area. We think the number of necessary VCs can be significantly reduced if the system is considered as a whole rather than each element being taken separately. Reduction in QoS support complexity can be achieved by eliminating certain redundancies in the traffic processing. In particular, some of the scheduling decisions performed at network interfaces can be easily reused at switches without altering significantly the global behavior of the schedulers. Therefore, the number of VCs per switch port can be reduced and flow control and buffer organization simplified. In this paper we show that it is enough to use two VCs: one of them for QoS traffic and another for best effort traffic. Results show that our proposal can achieve almost the same performance but with a great reduction in processing delay and in the number of VCs required.



 
Autores
 
Autor Detalles
MARTINEZ VICENTE, ALEJANDRO
ALFARO CORTES, FRANCISCO JOSÉ
SÁNCHEZ GARCÍA, JOSÉ LUIS
DUATO, JOSÉ



 
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diab-12-04-2.pdf 538.5K

 

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