Re: OS for realtime operation

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On 01/12/2012 09:44 PM, Raffaele Morelli wrote:
2012/1/13 david <gnome@xxxxxxxxxxxxx <mailto:gnome@xxxxxxxxxxxxx>>

    On 01/12/2012 06:15 AM, tee wrote:

        Hello,

        On 10/01/2012 13:44, Paul Davis wrote:

            2) the PREEMPT_RT kernel is substantially "more realtime"
            than any
            version of windows or OS X that you could lay your hands on.
            its more
            like an actual realtime OS than the kind of general purpose
            OS that
            regular Linux, Windows and OS X represent, though without
            actually
            being suitable (quite) for "hard RT" tasks.


        if someone needs such a kernel for debian, they are available at
        http://pengutronix.de/ software/linux-rt/debian_en. html
        <http://pengutronix.de/software/linux-rt/debian_en.html>


    I tried that once. Booting it just led to panics. I decided it
    didn't like my hardware for whatever reason.

    I'm doing ok with the stock Debian Sid kernel, but I don't need
    latency as low as others might.


Just to spread some KISS :-)
Compiling a debian RT kernel is quite straightforward.

Download debian sources or vanilla ones from kernel.org <http://kernel.org>
Patch according to your release (
http://www.kernel.org/pub/linux/kernel/projects/rt/ )

Run `make oldconfig` inside the sources dir, you will probably be asked
about configs in the newer kernel not found in .config-YOUR_RUNNING_KERNEL

Then follow the common workflow, run `make menuconfig`, at least change
only the PREEMPT opt and seti it to 'complete preemption'.

Create your linux-image debian package with make-kpkg
(http://www.debian.org/releases/stable/i386/ch08s06.html.en)

If your running kernel works this one will too 99.9%

my 0.02€
regards
-r

Thanks, but I don't need to compile a kernel to meet my RT needs.


--
David
gnome@xxxxxxxxxxxxx
authenticity, honesty, community
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