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. All best, sa ever, Andy [amaca...@debian.org]
