Comment 4 for bug 1919154

Since we have some customers need NO_HZ_FULL, I'd like to provide some updates and progress:

I've borrowed some machines including intel, AMD EPYC, arm64 servers
and now running some tests on a test kernel with
1. CONFIG_NO_HZ_FULL=y
2. not enable nohz_full in kernel cmdline
to evaluate if there is any performance impact

Old kernel seems to have some issues with NO_HZ_FULL built-in but not enable
So I will focus on kernel >= 5.15

For 5.15 test PPA (built with CONFIG_NO_HZ_FULL=y):
https://launchpad.net/~gerald-yang-tw/+archive/ubuntu/no-hz-full

for other versions 5.19 and 6.2, I will create more test PPAs for them
and keep updating the test status here

Thanks,
Gerald