Energy-Efficient Considerations on a Variable-Bitrate PCI-Express Device

Dynamic power management has been adopted in many systems to reduce the power/energy consumption by changing the system state dynamically. This paper explores energy efficiency for systems equipped with PCI-Express devices, which are designed for low power consumption and high performance, compared to corresponding PCI devices. We propose dynamic power management mechanism and a management policy for energy-efficient considerations. A case study for a variable-bit-rate local-area-network device under the PCI-Express specification is exploited to provide supports for dynamic packet transmission. Simulation results show that the proposed mechanism and policy would reduce the system energy consumption substantiall