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Reducing memory size in buffered crossbars with large internal flow control latency

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3 Author(s)
Luijten, R. ; IBM Zurich Res. Lab., Ruschlikon, Switzerland ; Minkenberg, C. ; Gusat, M.

A buffered crossbar supporting P priorities and a flow control latency of RT packets between the input adapter and the crossbar requires a memory of order O(N2*P*RT) packets in the crossbar to support any traffic pattern without blocking. We propose a new priority elevation mechanism that reduces the memory requirements to O(N2*RT) for large values of RT. Our analysis shows that our mechanism has no drawback on the usual performance metrics and that it only introduces a small priority unfairness and worst-case blocking of less than RT packet times. We further show that an optimized system using a crosspoint memory of size 2RT has an unfairness of less than 0.02% affected packets at 95% loading with an average burst size of 30 packets.

Published in:

Global Telecommunications Conference, 2003. GLOBECOM '03. IEEE  (Volume:7 )

Date of Conference:

1-5 Dec. 2003