[LAU] OS for realtime operation

[Nicola Pandini]

Il 13/01/2012 08:44, Raffaele Morelli ha scritto:
> 2012/1/13 david <gnome at hawaii.rr.com <mailto:gnome at hawaii.rr.com>>
>
>     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 
> <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
>

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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