RTAPI error and realtime delay at EMC launch

How long did you run the latency test? I know this won't fix the hardware problem but I'd run it for as long as it takes to see how bad the worst latency is... like 24 hours. If it is within reason then just adjust your base period...

Some info on the numbers here .

John

With a 28,000 latency I would be tempted to see what happened with a 40,000 base thread. You can still comfortably get 1800rpm from your steppers at 4x microstep at that timing. (And I suspect you will hit physical limits at lower speed than that)

Hey, Rick, thank you for your input. I have experienced the errors from startup to the next day after the system was started, unfortunately.

--HC

I usually only run the test for a few minutes. I will start it now...running...and leave it there. I've read that page you linked to, thank you. I've decided to monkey with this just a little more and then, if it doesn't get better, scrap this system and move on. I have two or three more PCs I can try loading the Live CD on and see if they work okay. They're older systems and that one Intel board you mentioned is sounding good to me. But I've not given up yet. I just changed some settings in the BIOS trying to resolve the aberrant latency problems and I've got a couple more I'll try later.

As long as I've got you, and tell me if I should post this as a separate topic, which CAM software do you use for creating G code for your plasma table? I'm using Vectric's Cut2D for the router table but I don't think it's going to do well for planning cuts on a plasma table.

Thank you.

--HC

Hey, Andy, I stopped the latency test I had started after Johns post and ran stepconf and set it to 40,000 and then ran EMC2 and immediately got the RTAPI error.

I've restarted the latency test to let it run a long time (overnight) and we'll see what I get.

Thank you.

--HC

Hey, John, I ran the latency test from after my reply to Andy until now (about a week) and with the system (obviously) running through the Matrix screensaver and a couple of random uses of the system (web searches) and through being out of town for Christmas. The latency times are:

Servo thread max jitter: 273915
Base thread max jitter: 113919

If you're still doing the holiday thing I'm sorry to be repetitive but what software do you use for CAM for your plasma table?

Thank you.

--HC