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General Mach Discussion / Re: How fast can you send G90 and get accurate feedback on the current XYZ position
« on: August 24, 2018, 10:33:44 PM »
23ms jitter would be bad... (Unusable). My guess is that it was actually 23us of jitter. This would be a average jitter for rtai real-time extensions.
Sam
Sam
Hi skunkworks,
my apologies to OP if this is off topic.
skunkworks:
I have seen that Linux CNC uses RealTime Extensions to achieve realtime performance. I also saw a video where at the end of the
installation of the Linux distro (with the RTE's) to test the realtime performance. The video of the system under test reported
'a jitter of 23ms'. This was reported to be normal and adequate for LinuxCNC.
Can you clarify what it was that I saw, I would not have thought that a communication loop which included 23ms jitter would have been
anything like sufficient for a realtime feedback controller?
Craig