Comparative performance analysis of directed flow control for real-time SCI

摘要

The distributed nature of routing and flow control in a register-insertion ring topology complicates priority en- forcement for real -time systems Two divergent approaches for priority enforcement for ring-based networks are re -viewed: a node-oriented scheme called preemptive priority queue and a ring-wide arbitration approach dubbed TRAIN. This paper introduces a hybrid protocol named directed flow control that combines node-and ring-oriented flow control to yield greater performance. A functional comparison of the three protocols as implemented on the scalable coherent interface is presented, followed by performance results obtained through high-fidelity modeling and simulation.