Embedded systems operating on high data workloads are becoming pervasive. ECA rule engines provide a flexible environment to support the management, reconfiguration and execution of business rules. However, modeling the performance of a rule engine is challenging because of its reactive nature. In this work we present the performance analysis of an ECA rule engine in the context of a supply chain scenario. We compare the performance predictions against the measured results obtained from our performance tool set, and show that despite its simplicity the performance prediction model is reasonably accurate.