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CPU values get reset when CPU goes offline/online #1507

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myllynen opened this issue Dec 29, 2021 · 0 comments

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myllynen commented Dec 29, 2021

CPU values get reset when CPU first goes offline and then comes back online:

# pmrep -i cpu3 -r -s 1 kernel.percpu.cpu.idle
  k.p.c.idle
        cpu3
    millisec
     1180890
# echo 0 > /sys/devices/system/cpu/cpu3/online
# echo 1 > /sys/devices/system/cpu/cpu3/online
# pmrep -i cpu3 -r -s 1 kernel.percpu.cpu.idle
  k.p.c.idle
        cpu3
    millisec
        1400

Recent iostat(1) versions avoid these resets but perhaps both approaches have their pros and cons.

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