Which kernel version is best for real time?

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?

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.

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?



 

Do you need the Realtek card?

Physically remove all unneeded hardware.

Try disabling all power-saving features you can.

./remove_all

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? 

When you get an error, what does:

halcmd show param *.tmax

(typed in a terminal)

show?

This will help determine where the fault lies

Whoa!

Don't desolder stuff!

You said Realtek card, not Realtek chip!

Cards are easily removeable, chips generally are not.

Don't mess with the motherboard.

8GB of dual channel ≥1333MHz RAM is fine.

Just making sure you're not trying to get by with like 2GB.