Interrupt Handling Architectures

Mejía-Álvarez, Pedro; Leyva-del-Foyo, Luis Eduardo; Díaz-Ramírez, Arnoldo

doi:10.1007/978-3-319-94493-7_6

Cited by 1 publication

(1 citation statement)

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“…To notify the CPU of newly available data, input devices like sensors and serial interfaces use interrupt requests that trigger Interrupt Service Routines (ISRs) on the controller. Due to the distinct priority spaces of ISRs and scheduled processes in RTOSs, interrupts preempt any currently running process independent of its priority [11]. On real-time devices this introduces a high level of unpredictability as the processing units are interrupted from outside the RTOS [9].…”

Section: Introductionmentioning

confidence: 99%

A priority-aware multiqueue NIC design for real-time IoT devices

Behnke

Wiesner

Danicki

et al. 2022

Proceedings of the 37th ACM/SIGAPP Symposium on Applied Computing

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Low-level embedded systems are used to control cyber-phyiscal systems in industrial and autonomous applications. They need to meet hard real-time requirements as unanticipated controller delays on moving machines can have devastating effects. Modern developments such as the industrial Internet of Things and autonomous machines require these devices to connect to large IP networks. Since Network Interface Controllers (NICs) trigger interrupts for incoming packets, real-time embedded systems are subject to unpredictable preemptions when connected to such networks.In this work, we propose a priority-aware NIC design to moderate network-generated interrupts by mapping IP flows to processes and based on that, consolidates their packets into different queues. These queues apply priority-dependent interrupt moderation.First experimental evaluations show that 93 % of interrupts can be saved leading to an 80 % decrease of processing delay of critical tasks in the configurations investigated.

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Section: Introductionmentioning

confidence: 99%