Accommodating short and long web traffic flows over a diffserv architecture

Authors:
Salvador Alcaraz;Katja Gilly;Carlos Juiz;Ramon Puigjaner
Affiliations:
Departamento de Fí/sica y Arquitectura de Computadores, Miguel Hern$#225/ndez University, Elche, Spain;Departamento de Fí/sica y Arquitectura de Computadores, Miguel Hern$#225/ndez University, Elche, Spain;Departament de Ciè/ncies Matemà/tiques i Informà/tica, University of Balearic Islands, Palma de Mallorca, Spain;Departament de Ciè/ncies Matemà/tiques i Informà/tica, University of Balearic Islands, Palma de Mallorca, Spain
Venue:
EPEW'11 Proceedings of the 8th European conference on Computer Performance Engineering
Year:
2011

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Abstract

DiffServ architecture has been widely used to achieve QoS over the Internet. Taking into account that HTTP traffic is the most extended protocol over the Internet community, many solutions have been proposed to supply QoS to this protocol. Traditionally, DiffServ architectures have considered two-colour markings in order to distinguish between high and low priorities. We investigate the special treatment for web traffic, whose pattern is very close to mice and elephants distribution flows in Internet. We differentiate flows into short and long classes in order to ensure QoS for short flows, but we try to achieve certain QoS for some long flows. Metering, shapering and marking processes are used to classify the incoming flows at the DiffServ using three-colour marking. The final algorithm has been named Long Flow Promotions (LFP). The simulation tool used is ns2 and the realistic synthetic web traffic has been generated with PackMime-HTTP. The results are compared to RED and DropTail queue management. LFP gets reasonably low latency values while providing high priority level to short flows and improving some performance parameters such as overhead and dropped packets.