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Hello!
My problem is CPU constant usage (15%), in the past I had very similar problem, and it was by co-worker, I resolved it as:
sudo nano /sys/module/drm_kms_helper/parameters/poll
Written-> "N"
sudo nano /etc/modprobe.d/local.conf
Written-> "options drm_kms_helper poll=N"
And it helped me, it worked before the update of kernel to version 3.8.3-2
Now I still have that files, so I don´t know what can I do...and I can´t see what process uses CPU.
(I am using Lenovo ThinkPad T400)
Last edited by comunicationsfert6 (2013-03-20 22:47:29)
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No hints as to what is using the cpu? Have you looked at something like top to see what might be running? Really this is not enough information.
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As wonderwoofy said, top or ps (ps -eo pid,pcpu,time,comm --sort pcpu) and perhaps powertop too would be helpful for diagnosis. Just make sure to post the output by bracketing it with [ code ][ /code ] (minus the spaces) in order to properly format it.
Last edited by the sad clown (2013-03-20 23:49:25)
I laugh, yet the joke is on me
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thanks a lot by explanation about diagnostic tools!
[i@cr ~]$ ps -eo pid,pcpu,time,comm --sort pcpu PID %CPU TIME COMMAND 1 0.0 00:00:00 systemd 2 0.0 00:00:00 kthreadd 3 0.0 00:00:00 ksoftirqd/0 5 0.0 00:00:00 kworker/0:0H 7 0.0 00:00:00 kworker/u:0H 8 0.0 00:00:00 migration/0 9 0.0 00:00:00 rcu_preempt 10 0.0 00:00:00 rcu_bh 11 0.0 00:00:00 rcu_sched 12 0.0 00:00:00 watchdog/0 13 0.0 00:00:00 watchdog/1 14 0.0 00:00:00 ksoftirqd/1 15 0.0 00:00:00 migration/1 17 0.0 00:00:00 kworker/1:0H 18 0.0 00:00:00 cpuset 19 0.0 00:00:00 khelper 20 0.0 00:00:00 kdevtmpfs 21 0.0 00:00:00 netns 22 0.0 00:00:00 bdi-default 23 0.0 00:00:00 kblockd 26 0.0 00:00:00 khungtaskd 27 0.0 00:00:00 kswapd0 28 0.0 00:00:00 ksmd 29 0.0 00:00:00 khugepaged 30 0.0 00:00:00 fsnotify_mark 31 0.0 00:00:00 crypto 35 0.0 00:00:00 kthrotld 37 0.0 00:00:00 deferwq 77 0.0 00:00:00 khubd 78 0.0 00:00:00 firewire 79 0.0 00:00:00 ata_sff 80 0.0 00:00:00 scsi_eh_0 81 0.0 00:00:00 scsi_eh_1 82 0.0 00:00:00 scsi_eh_2 83 0.0 00:00:00 scsi_eh_3 93 0.0 00:00:00 kworker/0:1H 94 0.0 00:00:00 kworker/1:1H 102 0.0 00:00:00 jbd2/sda7-8 103 0.0 00:00:00 ext4-dio-unwrit 114 0.0 00:00:00 systemd-udevd 118 0.0 00:00:00 systemd-journal 139 0.0 00:00:00 scsi_eh_4 140 0.0 00:00:00 iprt 213 0.0 00:00:00 kpsmoused 216 0.0 00:00:00 ktpacpid 221 0.0 00:00:00 kvm-irqfd-clean 231 0.0 00:00:00 cfg80211 232 0.0 00:00:00 pccardd 235 0.0 00:00:00 hd-audio0 252 0.0 00:00:00 iwlwifi 259 0.0 00:00:00 irq/48-mei 279 0.0 00:00:00 flush-8:0 327 0.0 00:00:00 hci0 328 0.0 00:00:00 kworker/u:1H 331 0.0 00:00:00 ext4-dio-unwrit 337 0.0 00:00:00 jbd2/sda8-8 338 0.0 00:00:00 ext4-dio-unwrit 348 0.0 00:00:00 systemd-logind 349 0.0 00:00:00 dbus-daemon 382 0.0 00:00:00 dhcpcd 1322 0.0 00:00:00 wpa_supplicant 1426 0.0 00:00:00 kworker/1:2 1516 0.0 00:00:00 sudo 1517 0.0 00:00:00 lxdm-binary 1527 0.0 00:00:00 lxsession 1541 0.0 00:00:00 dbus-launch 1542 0.0 00:00:00 dbus-daemon 1545 0.0 00:00:01 openbox 1549 0.0 00:00:00 pcmanfm 1553 0.0 00:00:00 gvfsd 1558 0.0 00:00:00 pinot-dbus-daem 1560 0.0 00:00:00 gvfsd-fuse 1564 0.0 00:00:00 menu-cached 1571 0.0 00:00:00 polkit-gnome-au 1574 0.0 00:00:00 gvfs-udisks2-vo 1577 0.0 00:00:00 udisksd 1581 0.0 00:00:00 polkitd 1583 0.0 00:00:00 at-spi-bus-laun 1588 0.0 00:00:00 dbus-daemon 1590 0.0 00:00:00 cat 1594 0.0 00:00:00 at-spi2-registr 3616 0.0 00:00:00 login 3619 0.0 00:00:00 login 3622 0.0 00:00:00 bash 3662 0.0 00:00:00 agetty 3800 0.0 00:00:00 gvfsd-trash 3944 0.0 00:00:00 kworker/0:0 3946 0.0 00:00:00 bash 4002 0.0 00:00:00 kworker/1:0 4010 0.0 00:00:00 gnome-pty-helpe 4011 0.0 00:00:00 bash 4044 0.0 00:00:00 gvfsd-metadata 4055 0.0 00:00:00 ps 3547 0.1 00:00:02 kworker/0:2 4034 0.1 00:00:00 kworker/1:1 4009 0.2 00:00:01 lxterminal 1548 0.3 00:00:09 lxpanel 1519 2.1 00:01:02 X 1612 7.6 00:03:37 kworker/u:3 4024 8.2 00:00:27 kworker/u:0 3994 8.5 00:00:54 kworker/u:1 4052 25.0 00:00:05 kworker/u:2 [i@cr ~]$
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So as I guess my problem connected with kworker...any idea how I can resolve it?
Thanks!
Last edited by comunicationsfert6 (2013-03-21 00:23:19)
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Sorry, I should have told you to sort with "--sort -pcpu". As for your output, here is your issue:
PID %CPU TIME COMMAND
4052 25.0 00:00:05 kworker/u:2
3994 8.5 00:00:54 kworker/u:1
4024 8.2 00:00:27 kworker/u:0
1612 7.6 00:03:37 kworker/u:3
kworker processes are normal. What isn't normal is the cpu%. Hopefully someone more knowledgeable than me will chime in. My suggestion would be to look at what applications/services I have running and try turning them on/off while observing top to see what makes a difference. Probably the easiest step would be to just stop X, and check what your processes are when you are just in a TTY.
Last edited by the sad clown (2013-03-21 01:00:57)
I laugh, yet the joke is on me
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Well, just after boot system, without run X, maybe I haven't any problem (and I heven't kworker/u... running), but after I run some simple applications like as alsamixer or htop (in TTY) kworkers/u start using 15% of CPU...
Last edited by comunicationsfert6 (2013-03-21 09:56:26)
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What kernel and processor are you running? I don't know if it will help you, but you could try bumping up your kernel to 3.8.5 from testing and see if it makes a difference.
Last edited by the sad clown (2013-03-30 00:06:29)
I laugh, yet the joke is on me
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I am suspecting, it is the same as this.
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