2.5.1. RT-linux 11.00 Performance Guide

Read This First

All performance numbers provided in this document are gathered using following Evaluation Modules unless otherwise specified.

Name	Description
AM62Ax SK	AM62Ax Starter Kit with ARM running at 1.2GHz, DDR data rate 3733 MT/S

Table: Evaluation Modules

About This Manual

This document provides performance data for each of the device drivers which are part of the Processor SDK Linux package. This document should be used in conjunction with release notes and user guides provided with the Processor SDK Linux package for information on specific issues present with drivers included in a particular release.

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2.5.1.1. System Benchmarks

Stress-ng and Cyclic Test

stress-ng (next-generation) will stress test a embedded platform in various selectable ways. It was designed to exercise various physical subsystems as well as the various operating system kernel interfaces. stress-ng can also measure test throughput rates; this can be useful to observe performance changes across different operating system or types of hardware.

Cyclictest is most commonly used for benchmarking RT systems. It is one of the most frequently used tools for evaluating the relative performance of real-time systems. Some performance tests which use Cyclictest are System benchmarking, Latency debugging with tracing and approximating application performance.

Test commands used for running stress-ng and cyclictest together

stress-ng --cpu-method=all -c 4 &
cyclictest -m -Sp80 -D6h -h400 -i200 -M -q

The latencies where observed with this SDK are summarized below:

Latencies	CPU 0	CPU 1	CPU 2	CPU 3
Minimum (us)	5	5	5	5
Average (us)	5	6	6	5
Maximum (us)	68	31	34	28