RTLinux vs Embedded Linux

Shure! There are both. Realtime Linuxes which are not embedded e.g. on a regular PC as well as there are embedded Linuxes without Realtime capabilities.

Sven

--
"Every time you use Google, you're using a Linux machine"
                             (Chris DiBona, a programs manager for Google)

/me is giggls@ircnet, http://sven.gegg.us/ on the Web

IMHO they have nothing in common.

My view:

"Embedded" means that during normal work a standard command-line or GUI user interface is not used. You don't _need_ to change anything in Linux to do that but you _can_ strip it down to have it run on a smaller/cheaper hardware.

(Hard) Realtime means that the system is able to guarantee that predefined reaction times to certain hardware events are met. Linux can't do this. (But there are add-ons that help). Soft Realtime means that the timing constrains are only failed in very rare cases. Linux can do this (activating Kernel preemption and other stuff when building the Kernel helps).

RTLinux is the name of a company that sells Linux distributions and support.

-Michael

Embedded linux is a generic term that desgin a linux made to work on a specific embedded platform without realtime functionality (in fact since

2.6 kernel, linux have some realtime functionalities) RTLinux, is a realtime kernel that run a Linux kernel as a task (an embedded Linux or not). RTLinux is a specific term for a specific solution.

In fact, you can have an embedded RTLinux :p

Guillaume

--
Guillaume Chevillot

Actually, to be clear, RTLinux was a product name of a real-time Linux product owned by a company named FSMLabs. The RTLinux solution (basically) is a modification that runs two operating systems. A small real-time OS and Linux running at the same time on the computer. Normal Linux applications running inside of the Linux portion of rtlinux are no more real-time than normal Linux is but one can achieve hard real-time performance in the smaller kernel that is running at the same time and the two partitions can communicate. In practice, one sometimes has only a small subset of the application that has hard real-time requirements.

As the years have gone by the standard kernel responsiveness in certain platforms and conditions has really begun to approach that of RTLinux.

Note that Wind River acquired the licenses for RTLinux from FSMLabs earlier this year.

Also note that while I am an occasional Wind river (vxWorks) user, I don't for for the company and I have not used their previous embedded linux product (other than a brief eval) and never did anything more than some playing with rtlinux a few years ago.

I would like to know the current status of the RTLinux Open. Some of other organizations also doing lot of works for RTLinux Open. But they did not touched anything in RTLinux patch. They are using the existing old patches. Ocera::

If any other Organizations for RTLinux, Let me know.

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-Prakash

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If I would be in your Position of setting up a new Project I would strongly consider to go for the newer Realtime Preempt

aproach instead of the older RTLinux stuff!

Sven

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/me is giggls@ircnet, http://sven.gegg.us/ on the Web