I have been goofing around with a rpi5 with the linuxcnc image. The latency looks good - but if you set a base thread of 50000ns - it will over-run. So - I don't think it is 'as good' as a good pc.
(just idle=poll and isolcpus 2,3,4) Still playing with tweeks to the rt kernel though - so maybe I can get it better. And - the hal_gpio driver does look very cool to configure the pi i/o sam https://photos.app.goo.gl/SqHxLeRUMLD5pMjf8 On Tue, Aug 27, 2024 at 12:02 PM Chris Albertson <albertson.ch...@gmail.com> wrote: > The Pi5 has very roughly about 70% of the performance of an Intel Core > i5-8250U. A lot of people are using Intel-based PCs that are slower and > older than the i5. > > Then, if you are using the Mesa FPGA cards, how much does the Linux > computer’s performance matter? > > Again, the storage device does matter. SD cards are very slow. The Pi5 > can use “real” SSD. > > > > On Aug 27, 2024, at 9:37 AM, John Dammeyer <jo...@autoartisans.com> > wrote: > > > > I've read a posting on another forum where the author states he's > running LinuxCNC with a Raspberry Pi using the Pi4 (and now Pi5) I/O pins > configured to duplicate the PC parallel port. With the quad core processor > on the Pi is it now fast enough to duplicate a PC with a parallel port or > is the guy full of BS? > > John > > > >> -----Original Message----- > >> From: Chris Albertson [mailto:albertson.ch...@gmail.com] > >> Sent: July 13, 2024 11:40 AM > >> To: Enhanced Machine Controller (EMC) > >> Subject: Re: [Emc-users] LinuxCNC 2.9.3 has been released > >> > >> If the old Lenovo PC has ahard drive, or better yet an SSD inside,then > it will > >> run much better then the Pi4 that is runniong off an SD card. Those > cards a > >> re very slow. > >> > >> If you want to upgrade the hardware replace th mechanical hard drive in > the > >> PC with a SATA SSD. If it already has an SSD, then you are good already > >> > >>> On Jul 13, 2024, at 11:24�AM, John Dammeyer <jo...@autoartisans.com> > >> wrote: > >>> > >>> > >>> > >>>> From: andy pugh [mailto:bodge...@gmail.com] > >>>> > >>>> On Sat, 13 Jul 2024 at 19:00, John Dammeyer <jo...@autoartisans.com> > >>>> wrote: > >>>>> > >>>>> Hi Andy, > >>>>> On my workbench for playing around I'm running 2.8.4 on a Pi4 with an > >> LCD > >>>> touch screen and the MESA 7i92H. How easy to update that? > >>>> > >>>> The best thing to do with a Pi is probably to make a new SD card from > >>>> the LinuxCNC image, then copy your existing config across (probably > >>>> easiest to put the linuxcnc folder on a USB stick then swap SD cards) > >>>> Then you can always go back to the old, working, SD card if there is a > >>>> problem. > >>>> > >>> > >>> Thanks. That's what I figured. > >>> What about the 2.8.1 PC? Better to replace it? I picked it up > surplus for > >> about $75 a number of years ago. I have a second one as a spare. > >>> John > >>> > >>> > >>> > >>> _______________________________________________ > >>> Emc-users mailing list > >>> Emc-users@lists.sourceforge.net > >>> https://lists.sourceforge.net/lists/listinfo/emc-users > >> > >> > >> > >> _______________________________________________ > >> Emc-users mailing list > >> Emc-users@lists.sourceforge.net > >> https://lists.sourceforge.net/lists/listinfo/emc-users > > > > > > > > _______________________________________________ > > Emc-users mailing list > > Emc-users@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/emc-users > > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
