Raspberry Pi 4 Tutorial - fatal error

andypugh wrote: How did it go?

I got Linuxcnc built and running in RIP. Running latency-test right now.

John

After about an hour of 6 GLXGears
Servo thread (1ms): 33201
Base thread (25us): 31888

Just after firing up the Chromium browser
Servo thread (1ms): 54854
Base thread (25us): 31888

After starting a video
Servo thread (1ms): 58737
Base thread (25us): 134737

After moving the browser around on the screen
Servo thread (1ms): 128371
Base thread (25us): 133737

The YouTube video played choppy. The most I would ever do while LinuxCNC was running but not during milling would be to look at he G-Code reference using the browser.

This is on a Rapsberry Pi 4 with 4GB and a SanDisk - Ultra Plus 32GB microSDHC UHS-I Memory Card

I think the top number with the just the 6 GLXGears running looks pretty good. Am I correct?

John

If your using an Ethernet Mesa card you can ignore the base thread.

I run the latency histogram like this:

And yes the servo thread numbers look fine.

JT

I ran it with no base for about 45min last night and got this.

Servo thread (1ms): 34925

If I were to actually put a Pi in my machine I would be using a Ethernet Mesa.

Thanks
John

In Stuttgart we successfully turned a lathe pawn with a Pi4 and Mesa Ethernet card. (This was on a lathe that was converted to CNC in only one day)

Andy,
Is there any pictures/video of it? It's always good to see what others have accomplished.