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Thread: High CPU usage for kworker, kswapd etc

  1. #1
    Join Date
    Jun 2014
    Posts
    6

    Question High CPU usage for kworker, kswapd etc

    We are running openSUSE 13.1 on a big server (2*10 Core XEON, 128GB). Every once in a while, the kernel processes (kworker, kswapd etc.) start to generate a significant amount of load on this system. The load becomes so high, that even bash response is slow.
    The issue goes away as soon as the system is rebootet.

    Neither dmesg nor /var/log/messages show something suspicious.

    Kernel: Linux [HOSTNAME] 3.11.10-21-default #1 SMP Mon Jul 21 15:28:46 UTC 2014 (9a9565d) x86_64 x86_64 x86_64 GNU/Linux

    Any ideas?

    Thanks in advance for your help!

  2. #2
    Join Date
    Feb 2009
    Location
    Spain
    Posts
    25,547

    Default Re: High CPU usage for kworker, kswapd etc

    On 2014-11-07 16:46, jg wrote:
    >
    > We are running openSUSE 13.1 on a big server (2*10 Core XEON, 128GB).
    > Every once in a while, the kernel processes (kworker, kswapd etc.) start
    > to generate a significant amount of load on this system. The load
    > becomes so high, that even bash response is slow.
    > The issue goes away as soon as the system is rebootet.


    Does that server need to write a constant flow of data? If yes, I
    remember a similar issue. IIRC, the filesystem metadata was cached in
    memory instead of writing, till the kernel finally decided to flush it
    all. Being a lot of data to be written, it took its time about it.

    If this is the case, a flush of the cache cures it. At least, it is
    faster than a reboot.

    Code:
    echo 3 > /proc/sys/vm/drop_caches
    :-?

    --
    Cheers / Saludos,

    Carlos E. R.
    (from 13.1 x86_64 "Bottle" at Telcontar)

  3. #3
    Join Date
    Jun 2014
    Posts
    6

    Default Re: High CPU usage for kworker, kswapd etc

    Thanks!

    Although we have no constant stream, the systems IO load can be quite high. We are doing a lot of file operations on that server.

    I'll give it a try!

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