Another realtime delay question - Mesa card

Yes, no, I said I still get realtime error messages. Every session, at some point.
Should I raise the servo period to like 180000?

You can try my 6.3 kernel and headers
download and install both with sudo dpkg -i
drive.google.com/drive/folders/1NzQIHnf9...chOOxaER?usp=sharing  

chienMouille wrote:

Yes, no, I said I still get realtime error messages. Every session, at some point.
Should I raise the servo period to like 180000?

Servo period should be at least 1000000 ( 1 million), not 180000.

Yes, sorry my bad I meant 1800000.
Would that be OK?

up to 2000000 is normally OK unless you have very high acceleration

What is considered very high acceleration? I have this as max in the INI file:

Servos are set for a step dir command with 2000 pulses per rev (3000 stepscale).

That's quite low acceleration (if in mm/s^2) = ~0.08g

That makes sense. I set up the speed by feel with the machine. It's plenty fast enough, like much faster than when it used to be a manual machine. But it's a dovetail mill, so the work envelop is rather small, say compared to a plasma cutter with long distances or a wood router which would need to be faster.

@rodw: Thank you for the link, I will try it later because I have a couple of time critical jobs to finish right now and don't want to risk to have the machine down for a while. I'll keep you updated!

I haven't had any more realtime errors since raising the servo thread to 1800000.

Should I still seek to upgrade my HW or install rodw's kernel?


Thanks a lot everyone, your help is very precious.

 

Unless you have an issue with motion, you should be fine.
The lower thread rate has no effect on maximum speed.

If you have very high acceleration the acceleration/
decceleration ramps will have fewer velocity steps at a
longer servo thread period, eventually a potential cause
of stalling.