Re: OS for realtime operation

Moshe Werner <moshwe@xxxxxxxxx> · Mon, 20 Feb 2012 09:37:54 +0200

Hi all!
Just wanted to let you know what we decided.

After much thought put into this we decided to take the plunge into the Arch Linux world.
We just liked the idea of tailoring our own system that answers to all our needs, and felt that with Arch this would be the most simple approach.

I wanted to thank you all for your inputs and very interesting posts!

Warm regards,
Moshe 

On Sat, Jan 14, 2012 at 12:37 PM, Nicola Pandini <nicola.pandini@xxxxxxxxx> wrote:

    Il 13/01/2012 08:44, Raffaele Morelli ha scritto:

      2012/1/13 david <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

          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

          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

    Hi, I'm using Debian Wheezy.

    I'm not comfortable in building kernel on my own, so I try Liquorix,
    that hasn't the RT patch, but is built with the kernel system timer
    set to 1000 hz (instead of the standard 250 hz), and that seems to
    improve the midi timing. (I read this somewhere in Rosengarden site,
    can anyone confirm this?)

    I work mostly with midi and samplers, so with rtirq and Liquorix it
    seems enough for me. 

    Are there better kernels for audio/midi operations in Wheezy? 

    -- 
Nicola

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