On Sunday 07 March 2021 06:58:01 Gene Heskett wrote: > On Sunday 07 March 2021 06:43:45 Gene Heskett wrote: > > Greetings folks; > > > > Experimenting with various ways to see if I can find out why the > > initial homing is so slow and loaded with windup effects, effects > > that do not seem to affect the stepper driven axises. > > > > It takes at least 5 seconds for it to get up to search speed, and > > another 5 seconds to get back to a stop after the home switch has > > been found, coasting 20-25 degrees getting stopped, then it goes > > into latch speed and takes another minute to get back to the switch > > edge. And theres a random offset being applied to the home position > > in the linuxcnc dro that does not exist > > > > The randomness gets obviously worse if I crank up the thread speeds, > > and causes a zero drift in the dro readings for repeatedly issuing > > the g0a5;g0a-15 while attempting to optimize the servo settings. > > > > This machine's install is your latest respin of buster. Download, > > burn and installed in late december IIRC. > > > > And rtapi shows up in an htop output, something that isolcpus > > normally hides from htop. That got me snooping. > > > > And there is no mention of isolcpus in /boot/grub/grub.cfg! > > > > From uname -a: > > 4.19.0-14-rt-amd64 #1 SMP PREEMPT RT Debian 4.19.171-2 (2021-01-30) > > x86_64 GNU/Linux > > > > Note the date! > > > > So, whats the current status of the isolcpus boot parameter? > > > > Also latency-test will not run, can't find the threads, fast or > > slow. > > And on repeat test, it does run, runs well. But the one remaining > atom's latency is horrible, 50+ u-s on both threads, the other 2 i5 > dells are in the 4 u-s region. I have another dell i5 to replace it > as soon as some 60 degree weather arrives. > > > So someting is fubared IMO, but what?
And, I just found that deleting position.txt while lcnc is stopped, or editing it to be all 0.0000000000 does not affect the dro on a rerun, and while once its homed, I can touch off xyz to effectively zero, I cannot touch off A, it has no effect. Thanks for any clues to quadruple check. 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) 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-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
