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2017-06-24 - 14:09

Dates and Events:

Breaking News:

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?


2014-11-18 00:00

Linux real-time: New stable release available -

but next one depends on more support from industrial users



OSADL Downloads

Download Latency Generator (used for calibration purposes)

Quick HOWTO

Download the file archive blocksys-0.4.tgz and type:

tar -zxvf blocksys-0.4.tgz
cd blocksys-0.4
make
modprobe blocksys

Then run the application

./mklatency

or, alternatively, a shell script with the same functionality

./mklatency.sh

Check out the generated latency:

tail /var/log/messages
[..]
[..] kernel: blocksys: CPU #0 will be blocked for 2000000 nops
[..] kernel: blocksys: CPU #0 blocked about 1270 us

You may then wish to check and to calibrate latency analysis tools such as cyclictest or the OSADL Latency Measurement Box by executing mklatency or mklatency.sh while these tools are running. The CYCLES constant in the mklatency.c source file and the $nops shell variable in mklatency.sh define the duration of the latency.

File archive

blocksys-0.4.tgz

Utilities mklatency/mklatency.sh and blocksys driver

3.9 K