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Journal of the ACM (JACM)
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SFCS '94 Proceedings of the 35th Annual Symposium on Foundations of Computer Science
Dynamic Window-Constrained Scheduling for Multimedia Applications
ICMCS '99 Proceedings of the 1999 IEEE International Conference on Multimedia Computing and Systems - Volume 02
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Multimedia Tools and Applications
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IEEE Transactions on Computers
Compiler-Supported Thread Management for Multithreaded Network Processors
ACM Transactions on Embedded Computing Systems (TECS)
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This paper describes the design and implementation of the Dynamic Window-Constrained Scheduling (DWCS)[1][2][3] algorithm to schedule packets on network processors. The DWCS algorithm characterizes multimedia streams with diverse Quality of Service (QoS) requirements. Earlier implementations of DWCS on Linux and Solaris machines use a heap-based implementation, which requires O(n) time to find the next packet and send it out, and which frequently moves heap elements. For speed improvements and conservation of memory bandwidth, our design uses a Hierarchically Indexed Linear Queue (HILQ). The HILQ substantially reduces the number of memory accesses by scattering packets sparsely into the queue. Experimental results demonstrate improved scalability compared to a heap-based implementation in supporting thousands of streams with strict real-time constraints, while causing no loss in accuracy compared to the standard DWCS algorithm.