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Low-level embedded systems are used to control cyber-phyiscal systems inindustrial and autonomous applications. They need to meet hard real-timerequirements as unanticipated controller delays on moving machines can havedevastating effects. Modern developments such as the industrial Internet ofThings and autonomous machines require these devices to connect to large IPnetworks. Since Network Interface Controllers (NICs) trigger interrupts forincoming packets, real-time embedded systems are subject to unpredictablepreemptions when connected to such networks.  In this work, we propose a priority-aware NIC design to moderatenetwork-generated interrupts by mapping IP flows to processes and based onthat, consolidates their packets into different queues. These queues applypriority-dependent interrupt moderation. First experimental evaluations showthat 93% of interrupts can be saved leading to an 80% decrease of processingdelay of critical tasks in the configurations investigated.

A Priority-Aware Multiqueue NIC Design