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Dynamic task mapping solutions based on task migration has been recently explored to perform run-time reallocation of task to maximize performance and optimize energy consumption in MPSoCs. Even if task migration can provide high flexibility, its overhead must be carefully evaluated when applied to soft real-time applications. In fact, these applications impose deadlines that may be missed during the migration process. In this paper we first present a middleware infrastructure supporting dynamic task allocation for NUMA architectures. Then we perform an extensive characterization of its impact on multimedia soft realtime applications using a software FM Radio benchmark.