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Mutual priority: a scheme for effective and efficient distributed schedulers for high-speed cell-based switches

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3 Author(s)
Xithalis, C. ; Dept. of Electr. & Comput. Eng., Patras Univ., Greece ; Gamvrili, M. ; Serpanos, D.N.

Distributed scheduling algorithms for cell-based virtual output queuing (VOQ) switches have led to high-performance schedulers. However, existing algorithms suffer from low service guarantees and a need for several iterations to provide high throughput. In this paper, we introduce the mutual priority concept, a new mechanism that addresses these issues. We prove that mutual priority algorithms achieve optimal service guarantee (N in an N × N switch) and lead to packet delays that outperform all existing algorithms with significant improvements: the delay achieved by the most efficient mutual priority algorithm is 4.5 times lower for high loads (i.e., reduced by 78%) than the delay achieved by the best existing scheduler for a single iteration execution, while for log N iterations the improved delay is 2.5 times lower (i.e., reduced by 60%). Importantly, mutual priority schedulers provide significantly high performance with a single iteration, outperforming all alternatives and achieving performance comparable to that with multiple iterations.

Published in:

High Performance Switching and Routing, 2005. HPSR. 2005 Workshop on

Date of Conference:

12-14 May 2005

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