USB activity causes network error

It is the included one yes. So you say I must select the option of "Use this connection ..."

Yes, but only for the network Mesa is attached to.

 You can check the irqmask ( and grub setup) with this script



usage

first

chmod + checkmask,txt

then

./checkmask.txt  [ethernet_device_name]


You can pin  the Ethernet IRQ to the last processor with this script


 

usage

first

chmod + pinirq,txt

then

sudo ./pinirq.txt  [ethernet_device_name]

To disable irq coalescing temporarily for testing:

sudo ethtool -C [ethernet_device_name]  rx-usecs 0

To permanently disable IRQ coalescing, you setup the RT ethernet interface in the interfaces file, something like:

auto eth0
iface eth0 inet static
address 10.10.10.1
hardware−irq−coalesce−rx−usecs 0





 

Thanks Peter I will try all of the above.

I got this result when I ran the checkmask file. I am sure that I don't know how to use isolcpu. I want to isolate two cores with last core being 7.  SO cores 6 and 7 to be used for linuxcnc.

Cores: 8
Actual CPU Mask: ff
Desired CPU Mask: 128
IRQ: 24
Kernel command line: BOOT_IMAGE=/boot/vmlinuz-6.1.0-40-rt-amd64 root=UUID=bfdcf9b0-7caa-4c4b-b4c3-585accea347a ro quiet isolcpus=2,7

Some basics here
access.redhat.com/solutions/480473
Bit more detailed
rigtorp.se/low-latency-guide/

Your config isolates core 2 & 7.

I read a while back about isolating cores that were on the same die....has something to do with cahe and the like. I really wish I could recall that article.