Why does RHEL7 show 2 LOC interrupts per second for nohz_full cpus?
Issue
- Why does RHEL7 show 2 LOC interrupts per second for nohz_full cpus?
[root@rhel7 ~]# taskset -c 12 sha1sum /dev/zero &
[1] 4438
[root@rhel7 ~]# perf stat -e irq_vectors:local_timer_entry -e irq_vectors:local_timer_exit -e context-switches -C 12 sleep 20
Performance counter stats for 'CPU(s) 12':
40 irq_vectors:local_timer_entry
40 irq_vectors:local_timer_exit
0 context-switches
20.000894842 seconds time elapsed
Environment
- Red Hat Enterprise Linux 7.x.
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