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Thread: Kswapd0 high CPU usage

  1. #1

    Default Kswapd0 high CPU usage

    For the past few weeks, my home server has experienced bouts of extremely high CPU usage courtesy of kswapd0. This came as quite a surprise to me since none of the software on my server is particularly resource-intensive. KSysGuard says as much; as I type this, it shows RAM usage as sitting at just under 1 GB, and I've got 4 GB installed. However, it also shows that 1.1 GB of swap space is being used.

    To make matters even more confusing, I used the command-line tool top to double-check RAM usage, and it paints a completely different picture:

    top - 17:00:14 up 1 day, 9:22, 4 users, load average: 3.32, 2.61, 2.14
    Tasks: 158 total, 2 running, 155 sleeping, 0 stopped, 1 zombie
    %Cpu(s): 6.7 us, 72.0 sy, 0.0 ni, 1.0 id, 19.2 wa, 0.0 hi, 1.1 si, 0.0 st
    KiB Mem: 3938232 total, 3786688 used, 151544 free, 1032 buffers
    KiB Swap: 4075516 total, 1181264 used, 2894252 free, 2953960 cached

    PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
    34 root 20 0 0 0 0 D 80.5 0.0 226:44.13 kswapd0
    638 root 20 0 176m 20m 8292 R 48.9 0.5 11:19.97 Xorg
    461 sickbea+ 20 0 1279m 66m 2196 S 16.3 1.7 114:08.57 python
    12331 honor 20 0 488m 17m 7748 S 3.7 0.5 0:44.75 ksysguard
    1635 honor 20 0 701m 21m 6132 S 2.3 0.5 8:03.55 kwin
    2459 honor 20 0 265m 11m 4048 S 2.0 0.3 1:01.08 krfb
    1593 root 20 0 0 0 0 D 1.7 0.0 1:51.23 flush-8:16
    1747 honor 20 0 1203m 58m 10m S 0.7 1.5 13:03.42 plasma-desktop
    11 root 20 0 0 0 0 S 0.3 0.0 1:36.69 rcu_preempt
    177 root 0 -20 0 0 0 S 0.3 0.0 2:09.07 kworker/0:1H
    464 sabnzbd 20 0 1492m 9600 2104 S 0.3 0.2 3:13.91 SABnzbd.py
    2782 honor 20 0 1007m 27m 8704 S 0.3 0.7 7:40.14 ktorrent
    1 root 20 0 46072 3340 848 S 0.0 0.1 0:01.18 systemd
    2 root 20 0 0 0 0 S 0.0 0.0 0:00.02 kthreadd
    3 root 20 0 0 0 0 S 0.0 0.0 0:08.96 ksoftirqd/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 0:00.10 migration/0
    9 root -2 0 0 0 0 S 0.0 0.0 0:15.35 rcuc/0
    10 root -2 0 0 0 0 S 0.0 0.0 0:00.00 rcub/0
    12 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcu_bh
    13 root 20 0 0 0 0 S 0.0 0.0 0:00.00 rcu_sched
    14 root rt 0 0 0 0 S 0.0 0.0 0:00.40 watchdog/0
    15 root rt 0 0 0 0 S 0.0 0.0 0:00.39 watchdog/1
    16 root -2 0 0 0 0 S 0.0 0.0 0:11.24 rcuc/1
    17 root 20 0 0 0 0 S 0.0 0.0 0:09.02 ksoftirqd/1
    18 root rt 0 0 0 0 S 0.0 0.0 0:00.12 migration/1
    20 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kworker/1:0H
    21 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 cpuset
    22 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 khelper
    23 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kdevtmpfs
    24 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 netns
    25 root 20 0 0 0 0 S 0.0 0.0 0:00.01 bdi-default
    26 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kintegrityd
    27 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kblockd
    28 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 ata_sff
    29 root 20 0 0 0 0 S 0.0 0.0 0:00.00 khubd
    30 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 md
    33 root 20 0 0 0 0 S 0.0 0.0 0:00.02 khungtaskd
    35 root 25 5 0 0 0 S 0.0 0.0 0:00.00 ksmd
    36 root 39 19 0 0 0 S 0.0 0.0 0:00.69 khugepaged
    37 root 20 0 0 0 0 S 0.0 0.0 0:00.00 fsnotify_mark
    38 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 crypto
    43 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kthrotld
    44 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kpsmoused
    46 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 deferwq
    83 root 20 0 0 0 0 S 0.0 0.0 0:00.00 scsi_eh_0
    84 root 20 0 0 0 0 S 0.0 0.0 0:00.00 scsi_eh_1
    85 root 20 0 0 0 0 S 0.0 0.0 0:00.78 kworker/u:2
    87 root 20 0 0 0 0 S 0.0 0.0 0:00.01 scsi_eh_2
    88 root 20 0 0 0 0 S 0.0 0.0 0:00.00 scsi_eh_3
    99 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kmpath_rdacd
    246 root 20 0 0 0 0 S 0.0 0.0 0:29.98 jbd2/sda1-8
    247 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 ext4-dio-unwrit
    254 root 20 0 0 0 0 S 0.0 0.0 0:05.55 flush-8:0
    273 root 0 -20 0 0 0 S 0.0 0.0 0:03.49 kworker/1:1H
    280 root 20 0 591m 11m 11m S 0.0 0.3 0:14.51 systemd-journal
    281 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kauditd
    312 root 20 0 39108 496 492 S 0.0 0.0 0:00.05 systemd-udevd
    358 root -51 0 0 0 0 S 0.0 0.0 0:00.00 irq/43-mei
    378 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 kvm-irqfd-clean
    386 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 hd-audio0
    401 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 led_workqueue
    443 root 20 0 0 0 0 S 0.0 0.0 0:01.54 jbd2/sda3-8
    444 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 ext4-dio-unwrit
    If I'm reading this correctly, top is saying that RAM usage is almost maxed out. What's going on here? How can I get kswapd0 under control? I did a search for similar topics, but the kernel bug talked about in earlier threads was supposedly fixed.

  2. #2
    Join Date
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    Smile Re: Kswapd0 high CPU usage

    Quote Originally Posted by 1cewolf View Post
    For the past few weeks, my home server has experienced bouts of extremely high CPU usage courtesy of kswapd0. This came as quite a surprise to me since none of the software on my server is particularly resource-intensive. KSysGuard says as much; as I type this, it shows RAM usage as sitting at just under 1 GB, and I've got 4 GB installed. However, it also shows that 1.1 GB of swap space is being used.

    To make matters even more confusing, I used the command-line tool top to double-check RAM usage, and it paints a completely different picture:



    If I'm reading this correctly, top is saying that RAM usage is almost maxed out. What's going on here? How can I get kswapd0 under control? I did a search for similar topics, but the kernel bug talked about in earlier threads was supposedly fixed.
    Please tell us of your openSUSE version and desktop being used and present kernel version. I find a lot of complaints like your with the most recent using kernel 3.7, included in openSUSE 12.3. Perhaps a kernel upgrade to 3.9 might help? Have a look here:


    openSUSE and Installing New Linux Kernel Versions - Blogs - openSUSE Forums

    Thank You,
    My Blog: https://forums.opensuse.org/blogs/jdmcdaniel3/

    Software efficiency halves every 18 months, thus compensating for Moore's Law

    Its James again from Austin, Texas

  3. #3

    Default Re: Kswapd0 high CPU usage

    Thank you. Upgrading kernel to 3.9 appears to have resolved this problem. In case someone with the same problem finds this thread later on, my server runs openSUSE 12.3 KDE, and the high CPU usage was caused by kernel 3.7, which 12.3 comes with.

  4. #4
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    Smile Re: Kswapd0 high CPU usage

    Quote Originally Posted by 1cewolf View Post
    Thank you. Upgrading kernel to 3.9 appears to have resolved this problem. In case someone with the same problem finds this thread later on, my server runs openSUSE 12.3 KDE, and the high CPU usage was caused by kernel 3.7, which 12.3 comes with.
    Good to hear a new kernel was the fix for this problem. What method did you decide to use to install kernel 3.9?

    Thank You,
    My Blog: https://forums.opensuse.org/blogs/jdmcdaniel3/

    Software efficiency halves every 18 months, thus compensating for Moore's Law

    Its James again from Austin, Texas

  5. #5

    Default Re: Kswapd0 high CPU usage

    It appears I may have spoken too soon. I used:

    Code:
    sudo zypper ar http://download.opensuse.org/repositories/Kernel:/stable/standard/ Kernel-Stable
    sudo zypper refresh
    sudo zypper in --from Kernel-Stable kernel-desktop
    The high CPU usage is back, and this time it's even more confusing than before. The old discrepancy in RAM usage between top and KSysGuard is back, and now there's a CPU usage discrepancy. Both top and KSysGuard report total CPU usage in the area of ~30%, but the CPU Monitor plasmoid I keep on the desktop sometimes shows much higher usage. I didn't have that before.

  6. #6
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    Smile Re: Kswapd0 high CPU usage

    Quote Originally Posted by 1cewolf View Post
    It appears I may have spoken too soon. I used:

    Code:
    sudo zypper ar http://download.opensuse.org/repositories/Kernel:/stable/standard/ Kernel-Stable
    sudo zypper refresh
    sudo zypper in --from Kernel-Stable kernel-desktop
    The high CPU usage is back, and this time it's even more confusing than before. The old discrepancy in RAM usage between top and KSysGuard is back, and now there's a CPU usage discrepancy. Both top and KSysGuard report total CPU usage in the area of ~30%, but the CPU Monitor plasmoid I keep on the desktop sometimes shows much higher usage. I didn't have that before.
    So that should be kernel 3.9.4. Did you check by using the terminal command uname -r?

    Thank You,
    My Blog: https://forums.opensuse.org/blogs/jdmcdaniel3/

    Software efficiency halves every 18 months, thus compensating for Moore's Law

    Its James again from Austin, Texas

  7. #7

    Default Re: Kswapd0 high CPU usage

    Yes, that's correct.
    Code:
    3.9.4-1.g51bf0ff-desktop

  8. #8

    Exclamation Re: Kswapd0 high CPU usage

    Please help!
    CPU usage 100% with "kswapd" process. All works slow (CPU occuped). This begin after boot and continue all the time PC working.
    I use openSUSE 13.1 KIWI image .iso. The same packages collection works fine on 12.3. I tink this is kernel bug...

    Here output of some commands:

    uname -a:
    Linux steel.linux 3.11.6-4-default #1 SMP Wed Oct 30 18:04:56 UTC 2013 (e6d4a27) i686 i686 i386 GNU/Linux
    (default kernel from OSS repo)

    lsb_release -a:
    Code:
    LSB Version:    core-2.0-noarch:core-3.2-noarch:core-4.0-noarch:core-2.0-ia32:core-3.2-ia32:core-4.0-ia32:desktop-4.0-ia32:desktop-4.0-noarch:graphics-2.0-ia32:graphics-2.0-noarch:graphics-3.2-ia32:graphics-3.2-noarch:graphics-4.0-ia32:graphics-4.0-noarch
    Distributor ID:    openSUSE project
    Description:    openSUSE 13.1 (Bottle) (i586)
    Release:    13.1
    Codename:    Bottle
    free -h:
    Code:
                 total       used       free     shared    buffers     cached
    Mem:          1,2G       1,1G        92M       125M       9,6M       813M
    -/+ buffers/cache:       277M       916M
    Swap:         1,5G       324M       1,2G
    top:
    http://paste.opensuse.org/88213307

    dmesg:
    http://paste.opensuse.org/33515517

    ps auxww:
    http://paste.opensuse.org/46676485

    zypper ls:
    http://paste.opensuse.org/46582839

    repos URLs:
    http://paste.org.ru/?5lvo73

    rpm -qa:
    http://paste.org.ru/?vsherh

  9. #9

    Default Re: Kswapd0 high CPU usage

    SOLVED. Was added "bad" repository.

  10. #10

    Exclamation Re: Kswapd0 high CPU usage

    SORRY! NOT SOLVED!
    CPU still 100% loaded

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