Improving the performance of packet-switched networks-on-chip by SDM-based adaptive shortcut paths |
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| Affiliation: | 1. School of Electrical and Computer Engineering, College of Engineering, University of Tehran, Tehran, Iran;2. Department of Computer Engineering, Sharif University of Technology, Tehran, Iran;3. School of Computer Science, Institute for Research in Fundamental Science (IPM), Tehran, Iran;1. Department of Electrical and Electronic Engineering, Bogazici University, Istanbul, Turkey;2. IMSE, CSIC and University of Seville, Spain;1. Department of Computer Science and Technology, Beijing University of Chemical Technology, No.15, Beisanhuan East Road, ChaoYang District, Beijing 100029, China;2. Key Laboratory of Computer System and Architecture, Institute of Computing Technology, Chinese Academy of Sciences, Beijing 100190, China;3. Department of Electronic and Communication Engineering, School of Electrical and Electronic Engineering, North China Electric Power University, Baoding 071003, China;4. School of Computer and Information, Hefei University of Technology, Hefei 230009, China;1. Electrical and Engineering Department, Shahed University, Tehran, Iran;2. School of ECE, College of Engineering, University of Tehran, Tehran, Iran;3. Computer Engineering Department, Ferdowsi University of Mashhad, Mashhad, Iran;4. School of Computer Science, IPM, Institute for Research in Fundamental Sciences (IPM), Tehran, Iran |
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| Abstract: | Reducing the NoC power is critical for scaling up the number of nodes in future many-core systems. Most NoC designs adopt packet-switching to benefit from its high throughput and excellent scalability. These benefits, however, come at the price of the power consumption and latency overheads of routers. Circuit-switching, on the other hand, enjoys a significant reduction in power and latency of communication by directing data over pre-established circuits, but the relatively large circuit setup time and low resource utilization of this switching mechanism is often prohibitive. In this paper, we address one of the major problems of circuit-switching, i.e. the circuit setup time overhead, by an efficient and fast algorithm based on the time-division multiplexing (TDM) scheme. We then further improve the performance by reserving circuits for anticipated messages, and hence completely hide circuit setup time. To address the low resource utilization problem, we integrate the proposed circuit-switching into a packet switched NoC and use unused circuit resources to transfer packet-switched data. Evaluation results show considerable reduction in NoC power consumption and packet latency. |
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| Keywords: | Network-on-chip Short-cut path Power Spatial-division multiplexing |
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