Performance evaluation of CPU isolation mechanisms in a multimedia OS kernel

David K. Y. Yau

doi:10.1117/12.410914

22 December 2000 Performance evaluation of CPU isolation mechanisms in a multimedia OS kernel

David K. Y. Yau

Proceedings Volume 4312, Multimedia Computing and Networking 2001; (2000) https://doi.org/10.1117/12.410914
Event: Photonics West 2001 - Electronic Imaging, 2001, San Jose, CA, United States

Abstract

To allow continuous media applications fine-grained control over their CPU allocations, and to protect these allocations from each other, thread priorities must have quality-of- service (QoS) interpretation. To this end, we present a CPU scheduler based on the well-defined resource specification of service curve. Service curve is distinguished from the traditional notion of rate by its ability to flexibly decouple delay and rate performance. Apart from how we compute thread priorities, predictable performance is hard to achieve also because threads can interact with each other and contend for synchronization resources. Such interactions can contribute to various forms of priority inversion. We discuss a new approach of dynamic priority inheritance in our CPU scheduler that solves priority inversion due to lock contention. To solve priority inversion arising from incompatible client/server resource specifications, we employ a train abstraction that allows a thread of control to visit multiple protection domains while carrying its resource and scheduling state intact. Train has been applied to real applications like a Solaris X window server. Finally, we present a mechanism for Internet flow specifications to reserve CPU time for network receive interrupt processing. We demonstrate an experimental system in which the combined techniques provide effective CPU isolation under various conditions of lock contention, client/server programming, and network processing.

Citation Download Citation

David K. Y. Yau "Performance evaluation of CPU isolation mechanisms in a multimedia OS kernel", Proc. SPIE 4312, Multimedia Computing and Networking 2001, (22 December 2000); https://doi.org/10.1117/12.410914

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