Institute of Electrical & Electronic Engineers
Voltage and Frequency Scaling (VFS) for NoC can potentially reduce energy consumption, but the associated increase in latency and degradation in throughput limits its deployment. The authors propose flexible pipeline routers that reconfigure pipeline stages upon VFS, so that latency through such routers remains constant. With minimal hardware overhead, the deployment of such routers allows them to reduce network frequency and save network energy, without significant performance degradation. Furthermore, they demonstrate the use of simple performance metrics to determine the optimal operation frequency, considering the energy/performance impact on all aspects of the system - the cores, the caches and the interconnection network.