A Novel Flit Serialization Strategy to Utilize Partially Faulty Links in Networks-on-Chip

Changlin Chen, Ye Lu, S. Cotofana
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引用次数: 21

Abstract

Aggressive MOS transistor size scaling substantially increase the probability of faults in NoC links due to manufacturing defects, process variations, and chip wire-out effects. Strategies have been proposed to tolerate faulty wires by replacing them with spare ones or by partially using the defective links. However, these strategies either suffer from high area and power overheads, or significantly increase the average network latency. In this paper, we propose a novel flit serialization method, which divides the links and flits into several sections, and serializes flit sections of adjacent flits to transmit them on all available fault-free link sections to avoid the complete waste of defective links bandwidth. Experimental results indicate that our method reduces the latency overhead significantly and enables graceful performance degradation, when compared with related partially faulty link usage proposals, and saves area and power overheads by up to 29% and 43.1%, respectively, when compared with spare wire replacement methods.
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一种利用片上网络部分故障链路的Flit串行化策略
激进的MOS晶体管尺寸缩放大大增加了由于制造缺陷,工艺变化和芯片布线效应而导致的NoC链路故障的可能性。已经提出了一些策略,通过用备用的电线替换它们或部分使用有缺陷的链路来容忍故障的电线。然而,这些策略要么受到高面积和功率开销的影响,要么显著增加平均网络延迟。本文提出了一种新的flit串行化方法,该方法将链路和flit分成若干段,并将相邻flit的flit段串行化,在所有可用的无故障链路段上传输,避免了有缺陷链路带宽的完全浪费。实验结果表明,与相关的部分故障链路使用方案相比,我们的方法显著降低了延迟开销,实现了优雅的性能下降,与备用线路替换方法相比,我们的方法分别节省了29%和43.1%的面积和功耗开销。
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