NDLI: McRouter: multicast within a router for high performance network-on-chips

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McRouter: multicast within a router for high performance network-on-chips

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McRouter: multicast within a router for high performance network-on-chips

Content Provider	ACM Digital Library
Author	Miwa, Shinobu He, Yuan Sasaki, Hiroshi Nakamura, Hiroshi
Abstract	The inevitable advent of the multi-core era has driven an increasing demand for low latency on-chip interconnection networks~(or NoCs). Being a critical part of the memory hierarchy for modern chip multi-processors~(CMPs), these networks face stringent design constraints to provide fast communication with tight power budget. Modern NoC's first-order concern is clearly its latency, while we also find that internal bandwidth of its routers is relatively plentiful; thus, we present a low latency router design utilizing a technique we call "multicast within a router" or McRouter, which allows productive utilization of remaining bandwidth inside a NoC router. McRouter allows a single cycle transfer of flits which shortens the communication latency when there is enough remaining bandwidth within the router. The key idea is to transmit a header flit to all possible output ports (multicast) so that it is always transmitted to the correct output port without relying on route computation. In addition, we find it is affordable with marginal power overhead while still being a stand-alone design by maintaining portability and modularity (unlike look-ahead routing based designs). Our evaluation with application traffic shows that McRouter helps achieving system speed-ups of 1.28, 1.17 and 1.05 over the conventional router~(CR), the VSA router~(VSAR) and the prediction router~(PR), respectively.
Starting Page	319
Ending Page	330
Page Count	12
File Format	PDF
ISBN	9781479910212
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2013-10-07
Access Restriction	Subscribed
Subject Keyword	Multicast Multi-core Network-on-chip Router Speculation
Content Type	Text
Resource Type	Article

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