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Title: Design of a high-throughput distributed shared-buffer NoC router
Authors: Ramanujam, Rohit Sunkam 
Lin, Bill 
Soteriou, Vassos 
Keywords: Clocks and watches;Computer architecture;Internet;Networks on a chip;Routers (Computer networks);Microprocessors
Category: Electrical Engineering - Electronic Engineering - Information Engineering
Field: Engineering and Technology
Issue Date: 2010
Publisher: IEEE Xplore
Source: 2010 Fourth ACM/IEEE International symposium on networks-on-chip (NOCS), 2010, pp. 68-78
Conference: Fourth ACM/IEEE International symposium on networks-on-chip (NOCS) 
Abstract: Router microarchitecture plays a central role in the performance of an on-chip network (NoC). Buffers are needed in routers to house incoming flits which cannot be immediately forwarded due to contention. This buffering can be done at the inputs or the outputs of a router, corresponding to an input-buffered router (IBR) or an output-buffered router (OBR). OBRs are attractive because they can sustain higher throughputs and have lower queuing delays under high loads than IBRs. However, a direct implementation of an OBR requires a router speedup equal to the number of ports, making such a design prohibitive under aggressive clocking needs and limited power budgets of most NoC applications. In this paper, we propose a new router design that aims to emulate an OBR practically, based on a distributed shared-buffer (DSB) router architecture. We introduce innovations to address the unique constraints of NoCs, including efficient pipelining and novel flow-control. We also present practical DSB configurations that can reduce the power overhead with negligible degradation in performance. The proposed DSB router achieves up to 19% higher throughput on synthetic traffic and reduces packet latency by 60% on average for SPLASH-2 benchmarks with high contention, compared to a state-of-art pipelined IBR. On average, the saturation throughput of DSB routers is within 10% of the theoretically ideal saturation throughput under the synthetic workloads evaluated
DOI: 10.1109/NOCS.2010.17
Rights: © Copyright 2010 IEEE
Type: Conference Papers
Appears in Collections:Κεφάλαια βιβλίων/Book chapters

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