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基于虫孔直通交换片上网络的共享优先级机制
吴陶迪,孙自强
作者单位E-mail
吴陶迪 华东理工大学化工过程先进控制和优化技术教育部重点实验室, 上海 200237  
孙自强 华东理工大学化工过程先进控制和优化技术教育部重点实验室, 上海 200237 sunziqiang@ecust.edu.cn 
摘要:
基于传统虫孔直通交换(Conventional Wormhole Cut-Through Switching,Con-WCTS)的片上网络系统(Network-on-Chip,NoC)无法直接实现基于优先级的仲裁逻辑,不适用于对信息传输实时性要求较高的多核片上系统。引入虚拟通道技术,提出了共享优先级虫孔直通交换(Shared Priority Wormhole Cut-Through Switching,SP-WCTS)的网络结构,并给出了该网络信息最坏传输时间的计算方法。通过实验对比了Con-WCT网络、共享优先级虫孔交换(Shared Priority Wormhole Switching,SP-WS)网络、SP-WCTS网络以及轮询虫孔交换(Round Robin Wormhole Switching,RR-WS)网络的可调度性,并探究了虚拟通道数量和总网络利用率对网络可调度性的影响。实验结果表明:SP-WCTS的可调度性要明显优于另外3种网络;虚拟通道数量和总网络利用率对SP-WS网络可调度性的影响大于共享优先级SP-WCTS网络。
关键词:  片上网络  虫孔直通交换  共享优先级  可调度性分析
DOI:10.14135/j.cnki.1006-3080.2017.02.016
分类号:
基金项目:上海市重点学科建设基金(B504)
A Shared Priority Policy in Wormhole Cut-Through Switching Based Network-on-Chip
WU Tao-di,SUN Zi-qiang
Abstract:
Network-on-Chip (NoC) based conventional wormhole cut-through switching (Con-WCTS) cannot employ the priority based arbitration logic directly,so it is not suitable for the multiprocessor system-on-chip with high real-time requirements.By utilizing the virtual channel technique,this paper constructs a shared priority wormhole cut-through switching (SP-WCTS) network and proposes a method to calculate the worst-case traversing time for the traffic-flow of the SP-WCTS NoC.Furthermore,some experiments are made for comparing the schedulability of Con-WCT,shared priority wormhole switching (SP-WS),SP-WCTS and round robin wormhole switching (RR-WS) NoCs and analyzing the effect of the number of VCs and the total network utilization on the schedulability of these different NoCs.It is shown that the SP-WCTS NoCs can achieves the best schedulability and the number of VCs has a greater effect on the schedulability of the SP-WS than SP-WCTS NoCs.
Key words:  network-on-chip  wormhole cut-through switching  shared priority  schedulability analysis

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