Power-aware NoC router using central forecasting-based dynamic virtual channel allocation
KTH, School of Information and Communication Technology (ICT), Electronic Systems
Conference paper (Refereed)
2010 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS
International Symposium on Circuits and Systems Nano-Bio Circuit Fabrics and Systems (ISCAS 2010). Paris, FRANCE. MAY 30-JUN 02, 2010
IEEE International Symposium on Circuits and Systems, ISSN 0271-4302
Engineering and Technology
In this paper, we propose a high performance central dynamic virtual channel allocation mechanism for on-chip routers. This central management unit devotes each input port a number of virtual channels (VC) among a shared VC bank based on a traffic forecasting technique. The forecasting technique exploits the link and VC utilizations in predicting the traffic. Based on the predicted traffic, for each input port, the number of active virtual channels may be increased, decreased, or kept unchanged. The clock-gating power management technique is used to activate/deactivate the VCs. Simulation results using uniform and Negative Exponential Distribution (NED) traffic profiles show that a considerable power savings in the virtual channels and overall router power consumption may be achieved especially in low traffic loads. The area overhead of the technique is negligible.