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Interconnect networks play a critical role in shared memory multi-processor systems-on-chip (MPSoC) designs. MPSoC performance and power consumption are greatly affected by the packet dataflows that are transported on the network. In this paper, by introducing a packetized on-chip communication power model, we discuss the packetization impact on MPSoC performance and power consumption. Particularly, we propose a quantitative analysis method to evaluate the relationship between different design options (cache, memory, packetization scheme, etc.) at the architectural level. From the benchmark experiments, we show that optimal performance and power tradeoff can be achieved by the selection of appropriate packet sizes.