@phil182182

8.3 netinstall

default boot options, no changes in BIOS.

USB with ISO did not work.

KVM with loaded ISO did the trick.
Wait long enough to make sure your ISO is uploaded fully.

Good luck!

@phil182182 We have done it on one EX130-S.
We had crashes with 8.2, but everything went fine with 8.3 Beta.

Online for about 1 month already with zero problems so far.

I suggest you to try the installation one more time with 8.3 Beta.

@olivierlambert Thank you!

Do you actually "feel" the difference in terms of VM performance for your services?

OF COURSE! Was very slow.
You cannot imagine the difference...

This is an AMD Ryzen 9 7950X3D host.
Moreover, since the problem started we migrated several VMs to other hosts.
If you see the screenshots above, in xentop output, besides Dom0, all other VMs where like hardly using 2-3 CPUs in total.
And everything was dead slow (steal time always high).

My feeling here is that this was somehow related to networking (tap*), but really don't know what and why.
Glad this was resolved after the reboot.