Which kernel version is best for real time?

youtube.com/shorts/mWCeSrF2TUM
I did a new test 100 windows of glxgears and CPU stresstest active the PC is no longer responsive even the linuxcnc window but the servo continues to go and finishes the job. I don't understand why YouTube goes into error! I must say that today the drivers arrived and the new servos do not make a minimum of noise but I have to check them in the car better.

Yeah I think even anon realtime kernel running a text editor with 100 glx windows open would become unresponsive. Honestly I'm of the opinion that is an unrealistic and silly test, that doesn't prove anything. You're testing for a situation that no sensible person would subject a computer to whilst running gcode.
Obviously you are expecting unrealistic things, and any further interaction is at this point a worthless endeavour on my part.

langdons wrote:

If your CNC setup works, then don't worry and just move on.

If you are paranoid, just set your max jitter to some really high value in your config.

Don't worry about stuff unless you need to.

I did it and the situation gets worse! if I only move the linucnc window the steppers make absurd noises and change the speed of movement, they are not yet on the machine they are free.. I don't dare to think what they could do at work!
do you mean this SERVO_PERIOD = 1000000 ?
I set it to 35000000. in the video with glxgear it is again at 1000000.

Do you have a Ethernet connected motion device?

If so, the latency test is relatively useless for determining the actual
LinuxCNC latency.

A simple ping test is much more informative:

sudo chrt 99 ping -i .001 -q -c 60000 [Device_IP]

(will run 1 minute and print out timing statistics)

Where device _IP is the IP address of your Ethernet motion control interface.
 

tommylight wrote:

Do you get latency warnings when you run LinuxCNC?

Yes, at start

tommylight wrote:

Are you still using the same PC discussed here on several topics?

Yes i change NVIDIA with ATI and is better, but error of junction with "Community test youtube video" still occurs.

tommylight wrote:

Why do you keep doing the same things and expect different results? Stressing the system beyond it's limits will always fail.
Change the graphic card, get a used one for AMD, or get a used PC.

www.youtube.com/shorts/mWCeSrF2TUM
Whith stress test and 100 GLXGEARS the work go at end with machine not responsive! But one youtube video give me junction error.

tommylight wrote:

You had good latency at one point in time, so what happened?

Yes is good youtube video junction error still occurs.

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PCW wrote:

Do you have a Ethernet connected motion device? 
If so, the latency test is relatively useless for determining the actual
LinuxCNC latency.
A simple ping test is much more informative:
sudo chrt 99 ping -i .001 -q -c 60000 [Device_IP]
(will run 1 minute and print out timing statistics)
Where device _IP is the IP address of your Ethernet motion control interface.

Yes PCW, is the same Realtek with dkms driver for fix latency.
Maybe I'm asking the wrong question: is it really necessary to do the test with YouTube?

Yes PCW, is the same Realtek with dkms driver for fix latency.
Maybe I'm asking the wrong question: is it really necessary to do the test with YouTube?

When you get an error, what does:

halcmd show param *.tmax

(typed in a terminal)

show?



 

PCW wrote:

Yes PCW, is the same Realtek with dkms driver for fix latency.
Maybe I'm asking the wrong question: is it really necessary to do the test with YouTube?

When you get an error, what does:

halcmd show param *.tmax

(typed in a terminal)

show?



 

 
next youtube video start i take junction error.

langdons wrote:

Did ya set the governor to performance?

Try to remove unnecessary hardware.

blacklist kernel modules of unneeded devices.

Mask and disable unneeded services.

Ensure you have plenty of RAM; disk I/O should be avoided as much as possible.

Caching and buffering will reduce disk I/O and latency, but requires ample free RAM.

need more of 8Gb ?  i need desolder realtek from my motherboard?