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forum.linuxcnc.org/38-general-linuxcnc-q...ults?start=40#327937
100 glxgears windows +  = no junction error
4k youtube video (1 or 2 or 3 or 4 windows) with or not remote connection = junction error

in need put like this in hal file:
i think the problem is not video but the network load.... i can't try a youtube video offline...  i do not why people tell to use this test for combo network + vga load?? 
I am newbee i read and make ... i try the way of new version kernel fot test but  the new kernel give me more latency.
I ma near to finish the CNC, next try real work for test ...
Sorry all for my bad bad english.

Yeah, sorry LangdonS, but do not use inexpensive power supplies, not worth the headache they cause, the time wasted finding they are the problem, nor the damage they might cause, and some are danger to life by not being isolated from the mains.
At a minimum use MeanWell or even better Delta, the price difference is not big.
Also, using old laptop power supplies is a very good idea, they are very high quality and do not fail.
For 5V supplies, there are very cheap and good quality ones form Anker, Baseus, Satechi, Gembird, just look for 5V only, so no QC or PD, always under 10$, isolated, protected, low ripple, etc.
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Another good idea is those same companies but the 65W PD adapters, use a trigger board set to 20V, they can be found on sale for 15-20$. I have plenty of these, like everywhere.
Waiting for 140W/28V ones to drop in price, one of these can easily handle 4 of so called TB6600 drives at full load with low inductance motors.
Although from experience, they really do not like back EMF. I killed one testing drones, as soon as you pull back the throttle fast = they die! Anker 65W, only the output in use died, the second output still works fine.

The threads are inches. I have tried lots of values. Currently slow enough that you can hear it winding up. Gets it moving but it will stutter to a halt after a couple turns.

DarkPhoinix wrote:

So why do they do these tests with 4 YouTube videos in 4k in the forum? in direct connection with stress test 100 GLXgears I can work safely even with NVIDIA! I got this AMD VGA and now I also bought a motherboard with HDMI output to pass the YouTube 4K video test!

Youtube is used to stress the video subsystem as video uses interrupts that require the PC to halt until whatever is requested by that interrupt is finished, then go on to do other stuff, and so on. I am not aware of anywhere being stated you must use 4 youtube videos, if you are, please let us know so we can fix that. A single window maximizing and minimizing is enough to trigger latency excursions, so 4 are overkill and prove nothing.
Same thing with GlxGears, video, but easier to run, but this also uses OpenGL that is used by LinuxCNC, namely Gremlin uses it to display the stuff being cut. We use 10 as it is very lite on resources, but 100?
You keep mentioning that under stress it works fine (even unresponsive, and this is something Linux does magnificently), so you can try adding a base period and test some values till you get something that gets rid of errors/issues.
Probably something like this should do, add to hal file:You can safely try from 10000 to 500000 (10K to 500K), above would probably not help at all and below might cause the PC to slow down.