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Fault-Tolerant Routing for Irregular Faulty Patterns in 2D-Mesh Without Virtual Channel

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Executive Summary

In wormhole meshes, many fault-tolerant routing algorithms have been proposed. None of them, however, can tolerate general (irregular) fault model without virtual channels. In this paper, a 0-virtual channel fault-tolerant dead-lockfree routing algorithm for general fault model is proposed for wormhole routing in two-dimensional meshes. Considering XY-routing as a precious property of two-dimensional meshes, the authors try to keep as many XY-routings as possible without incurring any deadlock. During the preprocessing, the mesh is divided into a number of fault-free (healthy) rectangular regions, and a minimum spanning tree connecting all these regions is built. Routing within a region uses XY-routing mainly; and routing across regions will use the spanning tree. An online solution is given for handling dynamic faults and recovery.

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