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Analysis of software- and hardwareinterrupt handling(with and without cache)

Fulltext:


Authors:

Lennart Lindh

Publication Type:

Conference/Workshop Paper

Venue:

Proceedings of the 3rd Design, Automation and Test Event

Abstract

In this article, we present a comparative study of hardware and software handling of external interrupts. The main parameter of the study is the response time from the hardware interrupt point to the start of interrupt handler task. The test platform used is a stand-alone card (PowerPC - processor, MPC860) with a bus logger (100ns-time tick). The software interrupt system used is a commercial standard real-time kernel, VRTX [VRTX] and the hardware system is RTU (Real-Time Unit) [RTU] with interrupt and scheduling in specialized hardware devices. The total response time in a software solution is the interrupt plus the scheduling latency. In a hardware solution, this is concurrent with the CPU and is faster. The test results are presented for both cases, viz., with and without cache. The study shows that hardware interrupt handling is faster, more predictable, simpler, and safer than the software handler.

Bibtex

@inproceedings{Lindh108,
author = {Lennart Lindh},
title = {Analysis of software- and hardwareinterrupt handling(with and without cache)},
month = {March},
year = {2000},
booktitle = {Proceedings of the 3rd Design, Automation and Test Event},
url = {http://www.es.mdu.se/publications/108-}
}