Dynamic voltage scaling and power management for portable systems

Control-theoretic dynamic frequency and voltage scaling for multimedia workloads

“…Our control design uses virtual training and an adaptive set-point to provide fast response and stable multimedia throughput, regardless of workload behavior/distribution. This system provides comparable energy savings to the change-point detection technique [19] but dramatically improves stability in average frame delay. It is also not dependent on the assumption of M/M/1 queuing behavior.…”

“…In the realm of power savings for multimedia workloads, change point detection algorithm based on DVS is introduced in [19]. This algorithm uses online statistical maximumlikelihood analysis to detect changes in aggregate behavior for a stream with an exponential distribution.…”

“…In order to simplify our control system design, we model the multimedia decoding system as an M/M/1 queue, as suggested in [19]. Thus, the following equation holds:…”

“…Though it seems that our scheme may consume a large amount of computation time and energy, the computation required for our controller is less than that of the changepoint detection approach proposed in [19]. We compare the amount of computation needed for both algorithms in the average case.…”

“…Following [19], this paper models an MPEG portable multimedia-playback system with the content received over a wireless network. These multimedia systems require soft RT guarantees on frame delay to maintain the throughput necessary for avoiding choppy playback.…”