> >This new Asus Z370-A II mobo has builtin gfx, and dmesg does not identify > >it. its carrying a 9nth gen i5, 6 core 3.7GHz cpu. Whatever its gfx is, > >is quick. glxgears reports: > >23060 frames in 5.0 seconds = 4611.867 FPS. > >But latency-test blows a 4 u-s reading out when a beep from incoming mail > >occurs puttin it above 100 u-secs, and that is while running the stretch > >iso's 4.9.0-11-rt-amd64 #1 SMP PREEMPT RT Debian 4.9.189-3+deb9u2 > >kernel. That would not do for software stepping IMNSHO. > > I have a Z370 and Z390 .... but ubuntu not debinan .... I have not problem > with acustic alarm .... ut latecy is about 40.000 ... no good for stepper > ... but enought for ethercat.
You are right, good enough for Ethercat with only one message sent each period using maybe up to a maximum 10% of bandwidth it will not matter where the message is sent within communication period. A great thing is only message is needed for communication in both directions regardless how many nodes there are. Ten times faster Ethernet, communication in both directions, five devices and for small messages size of header will catch up. Triggering sending Ethernet message with higher accuracy would of course be good. Ideally it should of course be hardware timer. But for ordinary machines in Linuxcnc it should not matter. _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
