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Video decoding is considered as one of the most compute and energy intensiveapplication in energy constrained mobile devices. Some specific processingunits, such as DSPs, are added to those devices in order to optimize theperformance and the energy consumption. However, in DSP video decoding, theinter-processor communication overhead may have a considerable impact on theperformance and the energy consumption. In this paper, we propose to evaluatethis overhead and analyse its impact on the performance and the energyconsumption as compared to the GPP decoding. Our work revealed that the GPP canbe the best choice in many cases due to the a significant overhead in DSPdecoding which may represents 30% of the total decoding energy.

Evaluation of the Performance/Energy Overhead in DSP Video Decoding and its Implications