Integrated CPU and Network-I/O QoS Management in an Endsystem

Realtime multimedia applications such as conferencing, broadcast video, and distributed virtual reality demand predictable QoS from both endsystem and network resources. We argue that in a general-purpose computer, applications do not know the exact resource requirements in advance, and resource requirements and resource availability change at runtime. To provide predictable QoS in such an environment, we have designed a resource-management architecture in which applications and the OS cooperate to dynamically adapt to variations in resource requirements and availability. We have implemented the resulting OS architecture, called AQUA (Adaptive Quality of service Architecture), in the Sun Solaris TM OS. This paper first shows how AQUA has been used it to manage CPU. Second, it shows how the CPU and network-I/O resources are managed in an integrated fashion to provide predictable QoS. The paper includes the result of an experimental evaluation. 1 Introduction The recent trend in incre..