On 05/06/2016 09:12 AM, Jim Craig wrote: > I have set up my router with my new computer. This computer runs at > about 25ms jitter on the base thread for hours with 2 glxgears running, > moving windows, copying files etc. I hope that is 25 us, not ms. 25 us is not great, as it causes a 2.5% fluctuation in the sampling period. > This system runs off a parport, and I set initially set it up in > stepconf wizard to have a 30ms jitter value. > > When I run LinuxCNC I get a realtime error a few minutes after I start > the program. The realtime error message tells the magnitude of the error, that is important. If it doesn't exceed your 25 us jitter, that is not a disaster. But, the realtime error message only fires once per run of LinuxCNC, and so you are then blind to any more serious errors that happen later. Not a great situation. > I am using 2.7.4. This is repeatable and happens each and > every time I run LinuxCNC. Yes, you will only get the message once. That does NOT mean that the error in not happening again! > I reran stepconf and changed the jitter value to 50ms to see if that > would fix it and it did not change anything. > > Stepconf has NOTHING to do with anything except software stepping, so it certainly will not "fix" this problem. What you did will generate a more conservative software stepping configs file set.
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