> Gesendet: Mittwoch, 27. Dezember 2023 um 17:13 Uhr > Von: "andy pugh" <bodge...@gmail.com> > An: "EMC developers" <emc-developers@lists.sourceforge.net> > Cc: "Steffen Möller" <steffen_moel...@gmx.de> > Betreff: Re: [Emc-developers] RPi5 + Raspbian + LinuxCNC latency tests - > first impressions > > On Wed, 27 Dec 2023 at 15:20, Steffen Möller via Emc-developers > <emc-developers@lists.sourceforge.net> wrote: > > > My RPi5 arrived over Xmas and I just fired it up, was offered to install > > LinuxCNC directly from what we offer in Debian, and then ran latency tests. > > Graphics (as in video but also the extra art from your X interface when > > ALT-tabbing through your applications) have the most effect on the latency. > > I/O from the SD does not seem to affect it too much. > > The numbers you show are _awful_ though? > > It doesn't look like the LinuxCNC installation has installed the > correct kernel. (I seem to recall that I had to do a fair bit of > fiddling to make it happen, it's a Pi thing)
Rebooted with Linux version 6.1.0-rpi7-rpi-2712 (debian-ker...@lists.debian.org) (gcc-12 (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40) #1 SMP PREEMPT Debian 1:6.1.63-1+rpt1 (2023-11-24) but do not see any relevant change. After fixing the process to a processor the max observed latency is reduced by a third (down to 23 million nanoseconds). That is with wifi, video and loads of I/O. No latencies observed as a regular user - so I am still excited about this new Pi. I just updated the firmware (the routine update could not do that because of a version conflict) and will then try again. Best, Steffen _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
