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Re: RT Kernel

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On Fri, 8 Jan 2021 23:38:47 +0000 (UTC)
not@telling.you.invalid (Computer Nerd Kev) wrote:

>Folderol <general@musically.me.uk> wrote:
>> Does anyone know if it is reasonably easy to get an RT kernel running on the Pi?
>> I'm using devuan beowulf to get a small footprint install *without* either
>> systemd or pulseaudio.
>> 
>> Actually, this is already better than the official OS when running purely with
>> ALSA.  
>
>You don't say what you're actually doing. I gather that it's some
>software audio synth, and I don't know anything about that
>application. I'm guessing it's probably existing Linux software
>though, so suggestions such as building for bare-metal or another
>OS are presumably not worthwhile.
>
>There's a lot of info here, though not Pi-specific. Setting CPU
>frequency scaling to "performance" was important for my application
>(I also needed to disable video output on HDMI/Composite):
>https://wiki.linuxaudio.org/wiki/system_configuration
>
>Real-Time patches for the Linux Kernel:
>PREEMPT_RT: https://wiki.linuxfoundation.org/realtime/start
>Xenomai
>RTAI
>
>There is a PREEMPT_RT patched Linux distro for the Pi (this one
>worked alright for me on a Pi Zero and seems to be fairly actively
>developed, there might be others that I've forgotten about):
>https://guysoft.wordpress.com/2017/10/09/realtimepi/

Thanks for all this further information.
It is indeed a software synthesiser, but a very unusual one. Whereas most of
these either work on sound samples, or previously generated wavetables, Yoshimi
creates everything on-the-fly from mathematical formulae. These can make
dynamic changes within individual cycles, resulting in incredibly rich sounds.

I do quite a lot of work on the overall structure but don't touch these sound
'engines' - I leave that to those with far better understanding or the
mathematics!

-- 
W J G

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RT Kernel Folderol <general@musically.me.uk> - 2021-01-07 17:26 +0000
  Re: RT Kernel Jim Jackson <jj@franjam.org.uk> - 2021-01-07 19:55 +0000
    Re: RT Kernel Folderol <general@musically.me.uk> - 2021-01-07 20:27 +0000
      Re: RT Kernel Jim Jackson <jj@franjam.org.uk> - 2021-01-07 20:35 +0000
        Re: RT Kernel Jan Panteltje <pNaOnStPeAlMtje@yahoo.com> - 2021-01-08 06:55 +0000
          Re: RT Kernel Deloptes <deloptes@gmail.com> - 2021-01-08 09:56 +0100
            Re: RT Kernel Ahem A Rivet's Shot <steveo@eircom.net> - 2021-01-08 09:27 +0000
              Re: RT Kernel Folderol <general@musically.me.uk> - 2021-01-08 11:16 +0000
                Re: RT Kernel Deloptes <deloptes@gmail.com> - 2021-01-08 12:42 +0100
                Re: RT Kernel The Natural Philosopher <tnp@invalid.invalid> - 2021-01-08 13:10 +0000
                Re: RT Kernel Folderol <general@musically.me.uk> - 2021-01-08 16:28 +0000
              Re: RT Kernel Charlie Gibbs <cgibbs@kltpzyxm.invalid> - 2021-01-08 18:06 +0000
            Re: RT Kernel nospam.Richard.Falken@f1.n770.z6534.fidonet.org (Richard Falken) - 2021-01-08 10:49 +1300
            Re: RT Kernel Jim Jackson <jj@franjam.org.uk> - 2021-01-08 18:06 +0000
            Re: RT Kernel Scott Alfter <scott@alfter.diespammersdie.us> - 2021-01-08 20:18 +0000
              Re: RT Kernel Deloptes <deloptes@gmail.com> - 2021-01-08 21:36 +0100
                Re: RT Kernel Scott Alfter <scott@alfter.diespammersdie.us> - 2021-01-10 22:28 +0000
              Re: RT Kernel not@telling.you.invalid (Computer Nerd Kev) - 2021-01-08 23:54 +0000
  Re: RT Kernel Martin Gregorie <martin@mydomain.invalid> - 2021-01-07 21:56 +0000
    Re: RT Kernel Folderol <general@musically.me.uk> - 2021-01-07 22:25 +0000
      Re: RT Kernel Martin Gregorie <martin@mydomain.invalid> - 2021-01-07 23:37 +0000
        Re: RT Kernel Folderol <general@musically.me.uk> - 2021-01-08 10:35 +0000
          Re: RT Kernel Martin Gregorie <martin@mydomain.invalid> - 2021-01-08 11:31 +0000
  Re: RT Kernel druck <news@druck.org.uk> - 2021-01-08 20:40 +0000
    Re: RT Kernel Folderol <general@musically.me.uk> - 2021-01-09 09:45 +0000
  Re: RT Kernel not@telling.you.invalid (Computer Nerd Kev) - 2021-01-08 23:38 +0000
    Re: RT Kernel Folderol <general@musically.me.uk> - 2021-01-09 10:05 +0000
      Re: RT Kernel Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2021-01-09 17:16 -0500
  Re: RT Kernel Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2021-01-08 22:54 -0500

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