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#1 2013-03-22 08:38:49
- cppking
- Member
- Registered: 2012-09-16
- Posts: 11
New kernel makes kworker crazy
today i got my Arch linux full system upgrade,then something bad happened.
my mouse stun again and again.
# uname -r
3.8.3-2-ARCH
# top
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
6 root 20 0 0 0 0 D 29.0 0.0 1:02.37 kworker/u:0
786 root 20 0 186m 33m 15m S 1.6 1.7 0:08.01 plugin-containe
544 root 19 -1 64504 17m 7100 S 0.8 0.9 0:15.62 X
1105 root 20 0 5376 1260 960 R 0.8 0.1 0:00.01 top
1 root 20 0 2188 652 588 S 0.0 0.0 0:00.68 init
2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd
3 root 20 0 0 0 0 S 0.0 0.0 0:00.22 ksoftirqd/0
4 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kworker/0:0
5 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kworker/0:0H
7 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kworker/u:0H
8 root rt 0 0 0 0 S 0.0 0.0 0:00.00 migration/0
9 root 20 0 0 0 0 S 0.0 0.0 0:00.34 rcu_preempt
10 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcu_bh
11 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcu_sched
12 root rt 0 0 0 0 S 0.0 0.0 0:00.00 watchdog/0
13 root rt 0 0 0 0 S 0.0 0.0 0:00.00 watchdog/1
14 root 20 0 0 0 0 S 0.0 0.0 0:00.22 ksoftirqd/1
kworker almost took 30% cpu usage.
then i did this :
#pacman -S linux-lts
and i changed to linux lts kernel
and kworker lost its insanity.
so i thought the problem of kworker must have some connections with newest relaeased kernel
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#2 2013-03-22 10:53:40
- Lone_Wolf
- Administrator
- From: Netherlands, Europe
- Registered: 2005-10-04
- Posts: 12,926
Re: New kernel makes kworker crazy
top - 11:51:01 up 2:21, 2 users, load average: 0.33, 0.29, 0.25
Tasks: 150 total, 2 running, 147 sleeping, 0 stopped, 1 zombie
%Cpu(s): 2.1 us, 1.0 sy, 0.0 ni, 96.8 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
KiB Mem: 16503552 total, 1882100 used, 14621452 free, 216268 buffers
KiB Swap: 19535036 total, 0 used, 19535036 free, 1038712 cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2310 root 19 -1 241m 67m 18m S 13.3 0.4 20:56.51 X
2340 panoram+ 20 0 873m 250m 40m S 10.3 1.6 11:04.67 firefox
2332 panoram+ 20 0 296m 15m 10m S 1.3 0.1 1:36.42 lxpanelx
3858 root 20 0 0 0 0 S 0.3 0.0 0:02.85 kworker/1:0
3869 root 20 0 0 0 0 R 0.3 0.0 0:01.61 kworker/0:0
3876 panoram+ 20 0 483m 32m 23m S 0.3 0.2 0:02.78 konsole
3896 root 20 0 0 0 0 S 0.3 0.0 0:00.45 kworker/2:2
3901 panoram+ 20 0 14472 1548 1068 R 0.3 0.0 0:00.31 top
1 root 20 0 4240 668 568 S 0.0 0.0 0:01.20 init-openrc
2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd
3 root 20 0 0 0 0 S 0.0 0.0 0:04.55 ksoftirqd/0
5 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kworker/0:0H
6 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kworker/u:0
7 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kworker/u:0H
8 root rt 0 0 0 0 S 0.0 0.0 0:00.01 migration/0
9 root 20 0 0 0 0 S 0.0 0.0 0:11.22 rcu_preempt
10 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcu_bh
11 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcu_sched
12 root rt 0 0 0 0 S 0.0 0.0 0:00.04 watchdog/0
13 root rt 0 0 0 0 S 0.0 0.0 0:00.04 watchdog/1
14 root 20 0 0 0 0 S 0.0 0.0 0:02.65 ksoftirqd/1
15 root rt 0 0 0 0 S 0.0 0.0 0:00.03 migration/1
17 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kworker/1:0H
18 root rt 0 0 0 0 S 0.0 0.0 0:00.04 watchdog/2
19 root 20 0 0 0 0 S 0.0 0.0 0:02.91 ksoftirqd/2
20 root rt 0 0 0 0 S 0.0 0.0 0:00.02 migration/2
22 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kworker/2:0H
23 root rt 0 0 0 0 S 0.0 0.0 0:00.04 watchdog/3
24 root 20 0 0 0 0 S 0.0 0.0 0:02.49 ksoftirqd/3
25 root rt 0 0 0 0 S 0.0 0.0 0:00.02 migration/3
27 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kworker/3:0H
28 root rt 0 0 0 0 S 0.0 0.0 0:00.04 watchdog/4
29 root 20 0 0 0 0 S 0.0 0.0 0:00.46 ksoftirqd/4
30 root rt 0 0 0 0 S 0.0 0.0 0:00.01 migration/4
32 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kworker/4:0H
33 root rt 0 0 0 0 S 0.0 0.0 0:00.04 watchdog/5
34 root 20 0 0 0 0 S 0.0 0.0 0:00.48 ksoftirqd/5
35 root rt 0 0 0 0 S 0.0 0.0 0:00.03 migration/5
36 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kworker/5:0
37 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kworker/5:0H
38 root rt 0 0 0 0 S 0.0 0.0 0:00.04 watchdog/6 uname -r
3.8.4-1-ARCH
Try upgrading, and also please use code tags next time, see https://bbs.archlinux.org/help.php#bbcode
Disliking systemd intensely, but not satisfied with alternatives so focusing on taming systemd.
clean chroot building not flexible enough ?
Try clean chroot manager by graysky
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#3 2013-03-23 12:23:03
- cppking
- Member
- Registered: 2012-09-16
- Posts: 11
Re: New kernel makes kworker crazy
same problem occured,my kernel is 3.8.4.1-ARCH
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#4 2013-03-29 12:19:14
- zequav
- Member
- Registered: 2013-03-02
- Posts: 9
Re: New kernel makes kworker crazy
Same here, acer 1810tz laptop with intel SU4100. I had the same problem with an old kernel (2.6.3x maybe) and solved it by disabling kms polling. But now it seems unrelated. It probably appeared with 3.8, and also seems to manifest itself when the cpu fan is running.
I also asked in the gentoo forums:
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#5 2013-03-29 15:29:10
- zequav
- Member
- Registered: 2013-03-02
- Posts: 9
Re: New kernel makes kworker crazy
Taking a look at /proc/interrupts when the kworkers bog down the CPU I see i915 starts interrupting like crazy, at a rate of >500 per second. When everything goes fine i915 interrupts at a rate of <50 per second. So i915 is the culprit again (in my case). Do you guys have an intel GPU?
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#6 2013-03-30 02:03:56
- gamanakis
- Member
- Registered: 2012-10-11
- Posts: 17
Re: New kernel makes kworker crazy
Lenovo X200, Intel X4500. i915 in use. Here the same problem too, since 3.8.x kernels excessive interrupts from i915.
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