This paper presents design principles of a predictable and efficient multi-core system to meet embedded computers requirements in avionics throughout a study of previous works and experimental analysis. Multi-core processors are commonplace for massive data processing and personal use. Much of such systems have a number of features whose primary purpose is to improve performance. These architectures are composed of black boxes when avionics requires white boxes to demonstrate that they can match avionics constraints. That's why we also propose an approach to manage bottlenecks in order to meet avionic requirements in terms of partitioning, performance and predictability (determinism).