Abstract
In this paper, we first analyze the effects of interrupt management on response latency of the latency-critical application and the efficiency of current dynamic power management governor which determines Voltage and Frequency States (V/F states) based on CPU utilization. We also demonstrate that interrupt management provides a governor an opportunity to decrease the V/F state without performance degradation. Next, we propose I-state that adjusts the interrupt rate based on the V/F state determined by the governor. When a core is highly utilized with a high V/F state, I-state improves response latency by decreasing interrupt rate, moderating the load on the CPU. I-state also improves energy-efficiency by making the governor decrease the V/F state more often. When a core is not highly utilized while operating at low V/F states, I-state improves response latency by increasing interrupt rate, which can notify the processor of packet arrivals faster so that the CPU processes the packets quickly. Our experimental results show that I-state improves 95 th percentile latency by up to 15.9x while reducing energy consumption by up to 17.6%.