Date: Fri, 9 Jun 2023 08:28:31 +0200 From: Juraj Lutter <otis@FreeBSD.org> To: FreeBSD CURRENT <freebsd-current@freebsd.org> Subject: CPU hog on -current (pfSense 23.05) Message-ID: <50D90C0F-4C92-4A6A-B1FD-D56609434AF4@FreeBSD.org>
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Hi,
since cca 7 days I=E2=80=99ve started to observe a CPU hog of one CPU =
core on APU2 box running pfSense 23.05 (if that matters).
mjg@ suggested to run a dtrace oneliner that showed:
~~~~~~
kernel`pmap_copy 33
kernel`amd64_syscall 33
kernel`vm_radix_insert 35
kernel`vm_map_pmap_enter 37
kernel`vm_radix_lookup_unlocked 38
kernel`memcpy_std 38
kernel`vm_object_deallocate 39
kernel`pmap_enter_quick_locked 41
kernel`em_update_stats_counters 43
kernel`copyout_nosmap_std 43
kernel`ck_epoch_poll_deferred 44
kernel`sbuf_put_bytes 46
kernel`vm_page_pqbatch_submit 48
kernel`pmap_remove_pte 51
kernel`pmap_pvh_remove 53
kernel`vm_pqbatch_process_page 54
kernel`cpu_search_highest 56
kernel`get_pv_entry 57
kernel`pmap_try_insert_pv_entry 59
kernel`vm_map_lookup_entry 65
kernel`epoch_call_task 92
kernel`pmap_enter 101
kernel`vm_fault 110
kernel`pagecopy 110
kernel`0xffffffff81 133
kernel`lock_delay 145
kernel`pmap_remove_pages 203
kernel`_thread_lock 415
kernel`pagezero_std 490
kernel`assert_rw 532
kernel`acpi_cpu_c1 600
kernel`callout_lock 641
kernel`kern_yield 1206
kernel`_callout_stop_safe 2010
kernel`spinlock_enter 2032
kernel`tcp_timer_stop 2703
0x0 5927
kernel`spinlock_exit 40964
kernel`cpu_idle 61943
kernel`sched_idletd 76722
~~~~~~~
The symptom is that the kernel thread "kernel{if_io_tqg_1}=E2=80=9D =
consumes 100% of the CPU core.
Can this be debugged any further?
I also suspect the hardware problem (I have one spare box where I=E2=80=99=
ll put my XML config
and test whether the problem will persist).
I=E2=80=99d be very thankful for any pointers.
Thanks!
otis
=E2=80=94
Juraj Lutter
otis@FreeBSD.org
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