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- W3003842159 abstract "Due to wire delay scalability and bandwidth limitations inherent in shared buses and dedicated links, packet-switched on-chip interconnection networks are fast emerging as the pervasive communication fabric to connect different processing elements in many-core chips. However, current state-of-the-art packet-switched networks rely on complex routers which increases the communication overhead and energy consumption as compared to the ideal interconnection fabric. In this paper, we try to close the gap between the state-of-the-art packet-switched network and the ideal interconnect by proposing express virtual channels (EVCs), a novel flow control mechanism which allows packets to virtually bypass intermediate routers along their path in a completely non-speculative fashion, thereby lowering the energy/delay towards that of a dedicated wire while simultaneously approaching ideal throughput with a practical design suitable for on-chip networks. Our evaluation results using a detailed cycle-accurate simulator on a range of synthetic traffic and SPLASH benchmark traces show upto 84% reduction in packet latency and upto 23% improvement in throughput while reducing the average router energy consumption by upto 38% over an existing state-of-the-art packet-switched design. When compared to the ideal interconnect, EVCs add just two cycles to the no-load latency, and are within 14% of the ideal throughput. Moreover, we show that the proposed design incurs a minimal hardware overhead while exhibiting excellent scalability with increasing network sizes." @default.
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- W3003842159 date "2007-06-09" @default.
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- W3003842159 title "Express virtual channels" @default.
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- W3003842159 doi "https://doi.org/10.1145/1273440.1250681" @default.
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