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The design of a QoS-controlled ATM-based communications system in Chorus

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6 Author(s)
G. Coulson ; Dept. of Comput., Lancaster Univ., UK ; A. Campbell ; P. Robin ; O. Blair
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We describe the design of an application platform able to run distributed real-time and multimedia applications alongside conventional UNIX programs. The platform is embedded in a microkernel/PC environment and supported by an ATM-based, QoS-driven communications stack. In particular, we focus on resource-management aspects of the design and deal with CPU scheduling, network resource-management and memory-management issues. An architecture is presented that guarantees QoS levels of both communications and processing with varying degrees of commitment as specified by user-level QoS parameters. The architecture uses admission tests to determine whether or not new activities can be accepted and includes modules to translate user-level QoS parameters into representations usable by the scheduling, network, and memory-management subsystems

Published in:

IEEE Journal on Selected Areas in Communications  (Volume:13 ,  Issue: 4 )