Comment 10 for bug 1919154

On AMD EPYC 7252

Hardware configs:
AMD64
32 CPUs
128G RAM, numa nodes: 2

Software configs:
OS: ubuntu 20.04
Official kernel: 5.15 hwe (5.15.0-86.96~20.04.1)
Test kernel: 5.15 hwe (5.15.0-86.96~20.04.1+test20231013b0)
https://launchpad.net/~gerald-yang-tw/+archive/ubuntu/focal-no-hz-full

Test case 1, without NO_HZ_FULL built-in (default ubuntu kernel config):
Run test program 4 times without taskset
tail -n 2 log/notaskset.*
==> log/notaskset.1 <==
total 14800791827 nsec
avg 148 nsec

==> log/notaskset.2 <==
total 14800224701 nsec
avg 148 nsec

==> log/notaskset.3 <==
total 14995047523 nsec
avg 149 nsec

==> log/notaskset.4 <==
total 15056157604 nsec
avg 150 nsec

Run test program 4 times with taskset to CPU 4
tail -n 2 log/taskset.*
==> log/taskset.1 <==
total 14886363654 nsec
avg 148 nsec

==> log/taskset.2 <==
total 14954637921 nsec
avg 149 nsec

==> log/taskset.3 <==
total 14784359811 nsec
avg 147 nsec

==> log/taskset.4 <==
total 14971006444 nsec
avg 149 nsec

Test case 2, with NO_HZ_FULL built-in but not activate in kernel cmdline:
Run test program 4 times without taskset
tail -n 2 nohz-log/notaskset.*
==> nohz-log1/notaskset.1 <==
total 15481330071 nsec
avg 154 nsec

==> nohz-log1/notaskset.2 <==
total 15336097628 nsec
avg 153 nsec

==> nohz-log1/notaskset.3 <==
total 15465283005 nsec
avg 154 nsec

==> nohz-log1/notaskset.4 <==
total 15575165790 nsec
avg 155 nsec

Run test program 4 times with taskset to CPU 4
tail -n 2 nohz-log1/taskset.*
==> nohz-log1/taskset.1 <==
total 15492308210 nsec
avg 154 nsec

==> nohz-log1/taskset.2 <==
total 15481404702 nsec
avg 154 nsec

==> nohz-log1/taskset.3 <==
total 15386525422 nsec
avg 153 nsec

==> nohz-log1/taskset.4 <==
total 15393744615 nsec
avg 153 nsec