Comment 14 for bug 2012763

There seems to have been some movement on this upstream:

https://lore.kernel<email address hidden>/T/#m4f61669a283a87623e4b8ce484e65c1bbaa76935

The exact commands we use typically are:
lxc init ubuntu:22.04 testbed --vm
# lxc config set testbed limits.cpu 1
lxc start testbed

and assume defaults on everything. (the commented config line was added in later as an experiement)

I don't have direct access to a system with that many cores, but I'll ask them to try all your suggestions and update the bug with results.