The important new information that I got from this is that AMD Zen 6 supports FRED (Flexible Return and Event Delivery), which was introduced first in Intel Panther Lake, at the beginning of this year.

FRED is a great improvement over the extremely inefficient mechanisms for handling interrupts, exceptions and system calls of x86-64, which had been constrained by inheriting most of their features from Intel 8086 and 80286, from more than a half of century ago.

FRED should decrease the overhead caused by the operating system for x86-64 CPUs.