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Award Finalist/Winner |
SC Conference - Activity Details
High-Radix Crossbar Switches Enabled by Proximity Communication
Authors:
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Hans Eberle
(Sun Microsystems)
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Pedro J. Garcia
(Universidad de Castilla-La Mancha)
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José Flich
(Universidad Politecnica de Valencia)
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José Duato
(Universidad Politecnica de Valencia)
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Robert Drost
(Sun Microsystems)
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Nils Gura
(Sun Microsystems)
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David Hopkins
(Sun Microsystems)
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Wladek Olesinski
(Sun Microsystems)
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Papers Session
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Processor and Switch Architecture
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Wednesday, 11:30AM - 12:00PM
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Room Ballroom F
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Abstract:
We describe a novel way to implement high-radix crossbar switches. Our work is enabled by a new chip interconnect technology called Proximity Communication (PxC) that offers unparalleled chip IO density. First, we show how a crossbar architecture is topologically mapped onto a PxC-enabled multi-chip module (MCM). Then, we describe a first prototype implementation of a small-scale switch based on a PxC MCM. Finally, we present a performance analysis of two large-scale switch configurations with 288 ports and 1,728 ports, respectively, contrasting a 1-stage PxC-enabled switch and a multi-stage switch using conventional technology. Our simulation results show that (a) arbitration delays in a large 1-stage switch can be considerable, (b) multi-stage switches are extremely susceptible to saturation under non-uniform traffic, a problem that becomes worse for higher radices (1-stage switches, in contrast, are not affected by this problem).
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