https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=226968
--- Comment #6 from Johannes Lundberg <johal...@gmail.com> ---
Here output from
# dtrace -n 'profile-997hz /arg0/ { @[func(arg0)]=count(); }'
run for about 10 seconds for each state
First idle state
-- SNIP --
linux_common.ko`linux_kernver 1
linux.ko`linux_gettimeofday 1
linux.ko`linux_sendsig 1
kernel`ithread_loop 2
kernel`witness_checkorder 2
kernel`witness_warn 2
linux.ko`0xffffffff820c2f60 2
kernel`_isitmyx 3
kernel`witness_unlock 4
kernel`vt_fb_bitblt_bitmap 11
kernel`spinlock_exit 11
kernel`cpu_idle 37
kernel`acpi_cpu_idle 26778
And then with cpu0:timer firing at 800k/s
-- SNIP --
kernel`pagezero 1
linux.ko`0xffffffff820c2f60 1
kernel`vt_fb_bitblt_text 2
kernel`vt_fb_bitblt_bitmap 11
kernel`lock_mtx 16
kernel`lock_delay 21
kernel`unlock_mtx 31
kernel`cpu_idle 55
kernel`callout_when 57
kernel`witness_lock 77
kernel`callout_reset_sbt_on 85
kernel`spinlock_enter 99
kernel`__mtx_lock_spin_flags 103
kernel`softclock_call_cc 118
kernel`ukbd_timeout 119
kernel`witness_checkorder 150
kernel`__mtx_assert 155
kernel`usbd_in_polling_mode 167
kernel`__mtx_lock_flags 179
kernel`__mtx_unlock_flags 180
kernel`ukbd_interrupt 298
kernel`memcpy 313
kernel`witness_unlock 318
kernel`spinlock_exit 11745
kernel`acpi_cpu_idle 45519
And some procstat -ak during irq storm
root@jd2:/usr/home/johannes # procstat -ak|grep 100023
12 100023 intr swi4: clock (0) mi_switch ithread_loop
fork_exit fork_trampoline
root@jd2:/usr/home/johannes # procstat -ak | grep 100023
12 100023 intr swi4: clock (0) <running>
root@jd2:/usr/home/johannes # procstat -ak | grep 100023
12 100023 intr swi4: clock (0) callout_reset_sbt_on
ukbd_timeout softclock_call_cc softclock intr_event_execute_handlers
ithread_loop fork_exit fork_trampoline
root@jd2:/usr/home/johannes # procstat -ak | grep 100023
12 100023 intr swi4: clock (0) <running>
root@jd2:/usr/home/johannes # procstat -ak | grep 100023
12 100023 intr swi4: clock (0) ukbd_timeout
softclock_call_cc softclock intr_event_execute_handlers ithread_loop fork_exit
fork_trampoline
root@jd2:/usr/home/johannes # procstat -ak | grep 100023
12 100023 intr swi4: clock (0) <running>
root@jd2:/usr/home/johannes # procstat -ak | grep 100023
12 100023 intr swi4: clock (0) ukbd_interrupt
ukbd_timeout softclock_call_cc softclock intr_event_execute_handlers
ithread_loop fork_exit fork_trampoline
root@jd2:/usr/home/johannes # procstat -ak | grep 100023
12 100023 intr swi4: clock (0) callout_reset_sbt_on
ukbd_timeout softclock_call_cc softclock intr_event_execute_handlers
ithread_loop fork_exit fork_trampoline
root@jd2:/usr/home/johannes # procstat -ak | grep 100023
12 100023 intr swi4: clock (0) callout_reset_sbt_on
ukbd_timeout softclock_call_cc softclock intr_event_execute_handlers
ithread_loop fork_exit fork_trampoline
root@jd2:/usr/home/johannes # procstat -ak | grep 100023
12 100023 intr swi4: clock (0) <running>
root@jd2:/usr/home/johannes # procstat -ak | grep 100023
12 100023 intr swi4: clock (0) callout_reset_sbt_on
ukbd_timeout softclock_call_cc softclock intr_event_execute_handlers
ithread_loop fork_exit fork_trampoline
root@jd2:/usr/home/johannes # procstat -ak | grep 100023
12 100023 intr swi4: clock (0) softclock
intr_event_execute_handlers ithread_loop fork_exit fork_trampoline
root@jd2:/usr/home/johannes # procstat -ak | grep 100023
12 100023 intr swi4: clock (0) ukbd_interrupt
ukbd_timeout softclock_call_cc softclock intr_event_execute_handlers
ithread_loop fork_exit fork_trampoline
--
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