On Monday, January 31, 2022 8:38:03 PM EST Steffen Möller wrote: > On 01.02.22 01:57, gene heskett wrote: > > On Monday, January 31, 2022 12:45:27 PM EST Steffen Möller wrote: > >> On 31.01.22 18:28, gene heskett wrote: > >>> On Monday, January 31, 2022 6:14:42 AM EST Steffen Möller wrote: > >>>> latency-test 1000000 5000000 > >>> > >>> And it works! > >> > >> This is great to hear! Thank you! This is 32bits now, right? > > > > On the pi, yes, I think the wintel machines are too. The kernels they > > are running are VERY long in the tooth, from 3.something I think.> > >> Where are > >> you at? > > [the latency I had meant] > > >> Now that I have the proper syntax, the rpi4b latency's for this > >> kernel > >> are amazing: > >> Linux rpi4.coyote.den 4.19.71-rt24-v7l+ #1 SMP PREEMPT RT Thu Feb 6 > >> 07:09:18 EST 2020 armv7l GNU/Linux, I built just shy of 2 years ago, > >> its reporting under 5 u-secs max jitter for both threads, and its > >> pretty stable. And my lathe is moving very smoothly with the new 3 > >> phase stepper servo's. I have not rebooted it back to bullseye to > >> see if the v5.16.2-rt19 I built last week is any better because so far, I haven't gotten past the python 3.9.2 problem. Throws boost under the bus. > > Save the effort. Let someone else try to beat your 5µs. This looks > good, indeed. > Truth be known, if firefox is fired up, things can get out toward 200 u- secs, but we ALL know that the current firefox is a pig. But generally the lcnc shutdown report is pretty decent, maybe 3 or so excessive time events in a couple hours running as most jobs can be finished in less time than that. Anything reading from the u-sd will cause a problem, but if it lcnc itself that caused it, it was loading or saving a file at the instant that caused it, not when it was actually running code. So THAT problem is universal, independent of the os running the show.
> What would be important is that you keep these 5µs when saving > something to the disk etc. or when there is a touch on the touch > screen etc. No touch screens actually in use here, and I only have one lcd monitor with it, an escapee from a grocery checkout, but the touch in it has not been hooked to anything but a test scope on my watch. > But I am already sold, will get a Pi again. > > Best, > Steffen > > > > _______________________________________________ > Emc-developers mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-developers 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/gene> _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
