Escape and restoration routing: Suspensive deadlock recovery in interconnection networks

In interconnection networks, deadlock recovery has been studied in routing strategy. The routing strategy for the deadlock recovery is intended to optimize the routing performance when deadlocks do not occur. On the other hand, it is important to improve the routing performance by handling deadlocks if they occur. In this paper, a routing strategy for suspensive deadlock recovery called an escape-restoration routing is proposed and it performance is evaluated. In the principle of the proposed techniques, a small amount of exclusive buffer (escape-buffer) at each router is prepared for handling one of deadlocked packets. The transmission of the packet is suspended by temporarily escaping it to the escape-buffer. After the other (leadlocked packets were sent. the suspended transmission resumes by restoring the escaped packet, Evaluation results show that the proposed technique can improve the routing performance more than that of the previous recovery-based techniques in handling deadlocks.