Optimizing Dynamic Performance Scaling for User Interface Performance

In this paper we introduce a novel approach for measuring and estimating effect of performance scaling for user interface latency and power consumption. Growing demand for higher performance in battery powered devices such laptop PC's has spawned techniques for dynamically decreasing performance in order to save energy and yet preserve high peak performance. For the evaluation of this approach we analyse system that uses dynamic voltage and frequency scaling technology for reducing power consumption based on CPU load. We focus on analysing effect of different parameters of the dynamic performance scaling such as length of time between load predictions. By using this measurement approach we were able to distinguish clear differences in energy consumption as well as in user interface performance