Open Source Automation Development Lab
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2008-05-13 - 01:05

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Breaking News:

20.03.08 12:00

Philippe Gerum + Denx + OSADL = Xenomai/SOLO

Xenomai

Port existing VxWorks applications smoothly to native Linux


15.03.08 12:00

Open Source meets Industry: Application Park and International Congress at the Hannover Fair 2008

Hannover Fair 2008

Visit the OSADL-organized Application Park, see leading Linux developers in Hannover, and meet the industry standard of the 21st century.



Realtime Linux

Is realtime possible with Linux? Yes, it is. But which Linux derivate should I use? This is the key question to be answered when Linux is going to be used in the automation industry.

The OSADL criteria for realtime Linux are:

  • Strong and agile community
  • Long term availability
  • Ease of use (user space realtime)
  • POSIX API for real time (standard API)
  • Wide architecture support
  • Mainstream support by the Vanilla Kernel

This project supports the evolution of the realtime preempt patch maintained by Ingo Molnar, and Thomas Gleixner. We believe that long term stability can only be achieved when the realtime aspects are as close to the Vanilla Kernel as possible.

Realtime Linux Road Map

This is the current status of Realtime Linux using the Realtime-Preempt patches:

Architecture

x86

x86/64

powerpc

arm

mips

68knommu

Feature

Deterministic scheduler

Preemption Support

PI Mutexes

1

High-Resolution Timer

2

2

2

2

3,5

Preemptive Read-Copy Update

4

4

4

4

4

1

IRQ Threads

5

5

5

5

5

1

Full Realtime Preemption Support


1

Available in mainline Linux
Available when Realtime-Preempt patches applied
Not yet available

1) Currently being developed
2) Since kernel 2.6.24
3) Already functional
4) Merged into the release candidate of kernel 2.6.25
5) Will possibly be scheduled for inclusion into mainline Linux 2.6.26

Download Locations of Realtime Linux

"Latest stable" Realtime Linux

Kernel

www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.21.6.tar.bz2

RT-Preempt Patch

www.kernel.org/pub/linux/kernel/projects/rt/older/patch-2.6.21.6-rt21

Realtime Linux Installation Howto

A description how to equip the Linux kernel wth realtime capabilities is given Opens internal link in current windowhere.

Links related to Realtime Linux