Abnormal sound of machine tool

I think this banging sound is related to the loss of the synchronization clock, so I want to use this link to solve it, but I am using a 2.9 environment and I don't have a 2.9 patch.

forum.linuxcnc.org/ethercat/35591-beckho...to-install?start=160
 

As PCW asked, what is the latency on your system?

I had some strange noise on my testbench setup, when I used a PC with latency issues. Since I am using a PID for my test axis, I could see it in Halscope pid.x.error.

This is the result of my delayed test. Do you think there will be a problem?

 

Try this test: (maybe for 30 minutes or 1 hour)
forum.linuxcnc.org/18-computer/39370-scr...-of-computer-latency

Download the script and run with sudo
forum.linuxcnc.org/media/kunena/attachme...09-30_2020-10-02.zip
The default latency test is too simple.

Also, download and install "ethtool" with sudo apt install ethtool and run 

sudo ethtool -c "your nic card here" 

Everything should be set to 0, if not you will introduce delay. 

use this to change the settings:

sudo ethtool -C "your nic card here" rx-usecs 0 
sudo ethtool -C "your nic card here" tx-usecs 0

as an example.