Date: Mon, 30 Jan 2023 14:37:59 +0100 From: Nikos Vassiliadis <nvass@gmx.com> To: Mike Karels <mike@karels.net> Cc: freebsd-stable@freebsd.org Subject: Re: Kernel is using a lot of CPU (was: Re: test) Message-ID: <trinity-d98f3cab-ba6e-4adc-b851-8dcfff3a8255-1675085879695@3c-app-mailcom-bs12> In-Reply-To: <EBF9C905-A592-4581-8C5E-734A8C2D7DCA@karels.net> References: <trinity-56f92d83-ab43-4da3-afb9-84b2d681fc81-1675076290963@3c-app-mailcom-bs08> <trinity-d7db87d6-5445-4a50-9bdb-eb7ea77dc5d4-1675076583253@3c-app-mailcom-bs08> <EBF9C905-A592-4581-8C5E-734A8C2D7DCA@karels.net>
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> Sent: Monday, January 30, 2023 at 3:27 PM
> From: "Mike Karels" <mike@karels.net>
> To: "Nikos Vassiliadis" <nvass@gmx.com>
> Cc: freebsd-stable@freebsd.org
> Subject: Re: Kernel is using a lot of CPU (was: Re: test)
>
> On 30 Jan 2023, at 5:03, Nikos Vassiliadis wrote:
>
> >> Hi,
> >>
> >> I just rebooted a system of mine and it seems that the kernel is constantly doing something. How could I debug this?
> >> I am thinking of rebooting it tonight
> >>
> >> root@aurora:~ # top -S -b
> >> last pid: 2196; load averages: 1.00, 1.00, 1.00 up 0+01:54:34 12:41:35
> >> 72 processes: 2 running, 69 sleeping, 1 waiting
> >> CPU: 0.0% user, 0.0% nice, 24.6% system, 0.0% interrupt, 75.3% idle
> >> Mem: 46M Active, 171M Inact, 1429M Wired, 14G Free
> >> ARC: 919M Total, 354M MFU, 487M MRU, 6912K Anon, 8726K Header, 63M Other
> >> 234M Compressed, 610M Uncompressed, 2.60:1 Ratio
> >> Swap: 16G Total, 16G Free
> >>
> >> PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND
> >> 11 root 4 155 ki31 0B 64K RUN 0 345:06 314.31% idle
> >> 0 root 49 -16 - 0B 784K swapin 1 112:27 99.85% kernel
> >> 30 root 319 -16 - 0B 5120K spa->s 3 0:06 0.00% zpool-aurora-os
> >> 1157 root 1 20 0 176M 150M select 2 0:05 0.00% smbd
> >> 1154 root 1 20 0 175M 150M select 2 0:05 0.00% smbd
> >>
> >> This is a 12.4-RELEASE system.
> >>
> >> Thanks for any ideas,
> >> Nikos
> >>
> >>
> >>
> >
> > Sending the email again with the correct subject
>
> You could add -H to the top command, which will show kernel threads within
> the kernel process.
>
> Mike
>
>
Thanks Mike,
A kernel thread named acpi_task_n seems to be the source of the problem. This system is rather old and was ok running 12.2-REL. Maybe some update to the ACPI code?. What could I try next?
nik@aurora:~ % top -H -S -b
last pid: 2529; load averages: 1.03, 1.03, 1.00 up 0+04:43:45 15:30:46
840 threads: 6 running, 820 sleeping, 14 waiting
CPU: 0.0% user, 0.0% nice, 24.6% system, 0.0% interrupt, 75.3% idle
Mem: 29M Active, 192M Inact, 1717M Wired, 13G Free
ARC: 1182M Total, 475M MFU, 608M MRU, 7744K Anon, 12M Header, 79M Other
312M Compressed, 782M Uncompressed, 2.51:1 Ratio
Swap: 16G Total, 16G Free
PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU COMMAND
11 root 155 ki31 0B 64K CPU3 3 272:53 100.00% idle{idle: cpu3}
11 root 155 ki31 0B 64K RUN 0 260:10 81.15% idle{idle: cpu0}
0 root 8 - 0B 784K - 3 141:30 76.76% kernel{acpi_task_2}
11 root 155 ki31 0B 64K CPU1 1 212:51 74.66% idle{idle: cpu1}
11 root 155 ki31 0B 64K RUN 2 108:52 51.86% idle{idle: cpu2}
0 root 8 - 0B 784K CPU2 2 116:25 24.27% kernel{acpi_task_0}
2324 root 20 0 177M 151M select 3 0:03 0.10% smbd{smbd}
0 root 8 - 0B 784K - 0 21:08 0.00% kernel{acpi_task_1}
0 root -16 - 0B 784K swapin 2 0:53 0.00% kernel{swapper}
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