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2022-07-04 - 05:16

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OSADL Articles:

2022-01-13 12:00

Phase #3 of OSADL project on OPC UA PubSub over TSN successfully completed

Another important milestone on the way to interoperable Open Source real-time Ethernet has been reached


2021-02-09 12:00

Open Source OPC UA PubSub over TSN project phase #3 launched

Letter of Intent with call for participation is now available


2016-11-12 12:00

Raspberry Pi and real-time Linux

Let's have a look at the OSADL QA Farm data


2016-09-17 12:00

Preemption latency of real-time Linux systems

How to measure it – and how to fix it, if it's too high?



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17th Real Time Linux Workshop, October 21 to 22, 2015 at the Virtual Vehicle Research Center, Graz, Austria

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Configuring lowest latency kernel

Michal Sojka, Czech Technical University in Prague
Karel Kočí, Czech Technical University in Prague

Linux kernel performance is a key parameter for many applications and tuning the kernel for optimal performance can be a challenging task. One reason is that there are many knobs one can use to tweak the performance. One such knob is compile-time configuration of the Linux kernel and in this paper, we are interested in how this configuration influences system response-time (latency), which is an important parameter for real-time applications.

We developed a tool that uses a SAT solver to systematically generate valid kernel configurations. For each configuration (typically, we have several thousands configurations) the kernel is compiled, booted and a set of benchmarks is executed. The benchmark results are processed and we try to calculate the contribution of individual configuration options to the benchmark results.

The benchmark used in this paper is the well-known cyclictest utility. We run our tool on several Linux kernel versions and architectures and report the results found.