IOPQ : uma fila para implementaÃÃo de serviÃos nÃo-eletivos na internet

AUTOR(ES)

Ramide Augusto Sales Dantas

DATA DE PUBLICAÇÃO

2005

RESUMO

Recent Internet research has been the scene for a number of Quality of Service (QoS) proposals. However, the best effort paradigm continues to be the only forwarding mechanism available in public IP networks and Intranets. The reasons for this are wide ranging. Most of the proposals are seen to be complex, difficult to provision and control. Furthermore, most providers still see in network resource over provisioning a simpler and more effective approach. Recently there has been a number of works, in an attempt to deal with the problem, based on the new concept of non-elevated services. These refer to the creation of different by equivalent services where, for example, multimedia applications may suffer lower delays to the detriment of higher packet loss rates. Unlike traditional QoS mechanisms, in non-elevated services the remaining bandwidth resources are not affected, giving equivalent treatment to different service classes. Different non-elevated proposals have been made and implemented with the combination of complex queue management and scheduling techniques. Similarly to other mechanisms, they require a great deal of fine-tuning efforts to get the desired services setup properly. This work presents a simple and yet very flexible new non-elective queueing mechanism, namely IOPQ (In/Out Priority Queue). IOPQ maintains service differentiation obtained by other non-elevated mechanisms while offering very low operational overhead, as well as the ability to emulate a large number of non-elevated services. IOPQ benefits have been validated using the network simulation environment ns-2 under a number of scenarios

ASSUNTO(S)

non-elevated services performance evaluation ciencia da computacao serviÃos nÃo-eletivos quality of service avaliaÃÃo de desempenho qualidade de serviÃo

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