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On the speedup required for work-conserving crossbar switches

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4 Author(s)
Krishna, P. ; Adv. Dev. Group, Digital Equip. Corp., Littleton, MA, USA ; Patel, N.S. ; Charny, A. ; Simcoe, R.

Describes the architecture for a work-conserving server using a combined input-output buffered crossbar switch. The switch employs a novel algorithm based on output occupancy-the Lowest-Occupancy-Output-First Algorithm (LOOFA)-and a speedup of only 2. A work-conserving switch provides the same throughput performance as an output buffered switch. The work-conserving property of the switch is independent of the switch size and input traffic pattern. We also present a suite of algorithms that can be used in combination with LOOFA. These algorithms determine the fairness and delay properties of the switch. We also describe a mechanism to provide delay bounds for real-time traffic using LOOFA. These delay bounds are achievable without requiring output buffered switch emulation

Published in:

Quality of Service, 1998. (IWQoS 98) 1998 Sixth International Workshop on

Date of Conference:

18-20 May 1998

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