> > You will find it noticeably slower than the intel stuff we are getting > used to. > > 1. It will have latencytest figures in the 12 u-second are when it not > doing > anything else. More than good enough to run LinuxCNC. > > 2. Use until I say different, raspios buster. The python in raspios > bullseye is too new for LinuxCNC. > > 3. most other activity except for running Firefox won't bother the > machine its running. > Firefox is an IRQ pig, and the machine WILL stutter. > > 4. if like me, you've a whole passel of hand controls of it, I have a > pair of mpja.com's > $22 100 ppi dial encoder's on the apron, straddling the x motor drive, > one running X jog, > one runs Z jog and back when I was running it with the slower pi3, I > setup a second, > 200 Hz "jog thread" and put all the hand stuff in it, in execution order > of course. Based > on the theory that the human hand can't move any faster than that. It > still acts and > feels like realtime to me, but it freed up the servo-thread to get the > real work done on > the pi3b. And I never tried to make it back to a more normal > servo-thread when I > installed a pi4 and booted it from the same armhf based card. If that > interested, I'll > put some more stuff up on my web page. I need to write up a README on > how to install > the kernel I've been using yet, but the tarball can be had from my site > as of a few days ago. > The install is simple but the foundation frowns on unofficial kernels so > I had to invent my > own install procedure using a card reader > > 5. uptimes are from power outage to power outage, I can't remember the > last time I > actually had to reboot it. I've a small USP on it, and a 20kw standby in > the back yard. >
Hi Gene, I hope you're doing well! Since all the machines I use for LCNC only run LCNC I think the RPi4 should work well for me. The only thing that's always pushing me back is the price. I can purchase mother + micro + RAM and go with an intel PC and I even have money left for the SSD with what they ask for a RPi4. But I really dig into the idea of having something as compact as the PI for all the logic. Take care :) El jue, 30 jun 2022 a las 14:55, gene heskett (<[email protected]>) escribió: > On 6/30/22 12:05, Leonardo Marsaglia wrote: > > I guess you just convinced me about purchasing a RPi4 and start > > experimenting with it :). I would love to use one of those for my next > > project or motherboard replacement. > > > You will find it noticeably slower than the intel stuff we are getting > used to. > > 1. It will have latencytest figures in the 12 u-second are when it not > doing > anything else. More than good enough to run LinuxCNC. > > 2. Use until I say different, raspios buster. The python in raspios > bullseye is too new for LinuxCNC. > > 3. most other activity except for running Firefox won't bother the > machine its running. > Firefox is an IRQ pig, and the machine WILL stutter. > > 4. if like me, you've a whole passel of hand controls of it, I have a > pair of mpja.com's > $22 100 ppi dial encoder's on the apron, straddling the x motor drive, > one running X jog, > one runs Z jog and back when I was running it with the slower pi3, I > setup a second, > 200 Hz "jog thread" and put all the hand stuff in it, in execution order > of course. Based > on the theory that the human hand can't move any faster than that. It > still acts and > feels like realtime to me, but it freed up the servo-thread to get the > real work done on > the pi3b. And I never tried to make it back to a more normal > servo-thread when I > installed a pi4 and booted it from the same armhf based card. If that > interested, I'll > put some more stuff up on my web page. I need to write up a README on > how to install > the kernel I've been using yet, but the tarball can be had from my site > as of a few days ago. > The install is simple but the foundation frowns on unofficial kernels so > I had to invent my > own install procedure using a card reader > > 5. uptimes are from power outage to power outage, I can't remember the > last time I > actually had to reboot it. I've a small USP on it, and a 20kw standby in > the back yard. > > See my Sig for the URL. > [...] > Take care and stay well. > > Cheers, Gene Heskett. > -- > "There are four boxes to be used in defense of liberty: > soap, ballot, jury, and ammo. Please use in that order." > -Ed Howdershelt (Author, 1940) > If we desire respect for the law, we must first make the law respectable. > - Louis D. Brandeis > Genes Web page <http://geneslinuxbox.net:6309/> > > > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
