Re: swap-fle on arm64, need to disable, how?

[David Wright <deblis@lionunicorn.co.uk>]

On Sun 01 Oct 2023 at 13:39:17 (+0000), Andrew M.A. Cater wrote:
> On Sun, Oct 01, 2023 at 08:58:36AM -0400, Greg Wooledge wrote:
> > On Sun, Oct 01, 2023 at 05:07:48AM -0400, gene heskett wrote:
> > > You've a good view of this hw. However swap is not important to run
> > > linuxcnc, in fact its to be avoided because it messes with realtime
> > > response. Linuxcnc needs, even with much of the control offloaded to mesa
> > > and similar smart cards, it still needs to check what the machine is doing
> > > 1000 times a second. The way I'm doing it, the wobble in this timing as 50
> > > to 80 microseconds, which doesn't bother the machine all that much, the real
> > > time killer is firing up firefox which can lock out the irq response for
> > > hundreds of milliseconds.  So I don't carve metal and browse the web at the
> > > same time.
> > 
> > If Firefox is really just for "browsing the web", and is not part of
> > the user interface for the CNC pieces, I don't understand why you run
> > Firefox on this machine at all.  I would run the browser on a separate
> > computer, one which isn't so critical to your operation.
> >
> Echoing Greg:
> 
> 2G is a fairly small amount of memory - by default the *Debian* install
> for RPi 4 now gives you 1G of swap on whatever medium - which you should
> never need to use.
> 
> It would make sense for something real time critical to be on a 2GB or 4GB RPi
> on it's own - if you're running modellers or whatever for 3D printing, that
> might be different but a command line or simplest web interface might be
> best. You REALLY don't want anything extraneous.
> 
> Pi 4GB or 8GB are now available more or less: your BananaPi - you are *very*
> much on your own.

Back in 2018, Gene's explanation was:

  https://lists.debian.org/debian-user/2018/11/msg00049.html

Cheers,
David.