AIX

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  • 1.  Disk VIOS High CPU Load

    Posted Fri June 18, 2021 05:44 AM
    Hello List,
    I'm facing high CPU Load on my DISK VIOS running 3.1.1.25.
    When investigating I stumbled over
    Why emfc_kpr use high CPU in VIOS 3.1?
    Ibm remove preview
    Why emfc_kpr use high CPU in VIOS 3.1?
    After migration from VIOS 2.2 to 3.1, why the emfc_kpr process is one of the top processes CPU consumption the list?
    View this on Ibm >


    We are using E980 with 4 VIOS concept (2 for Network IO - 2 for Disk IO).
    Expectation was that Network VIOS are the ones consuming more CPU.

    This is not true anymore since upgrade to VIOS 3.1.
    diskvio1e980b: 10:46AM up 197 days, 21 hrs, 2 users, load average: 9.89, 8.73, 8.24
    diskvio2e980a: 10:46AM up 9 days, 23 mins, 3 users, load average: 3.52, 3.24, 3.63
    diskvio1e980a: 10:46AM up 8 days, 18:09, 1 user, load average: 3.71, 3.71, 3.86
    diskvio2e980b: 10:46AM up 197 days, 21 hrs, 3 users, load average: 7.33, 7.15, 7.23

    Entitlement has been raised from 1.5 (which was more than enough in previo3.1 times) to 3 now on Disk VIOS.
    To plan for future Disk VIOS implementations I need to know how to calculate the Disk VIOS?

    Call has been opened at IBM side to track the situation.

    Has anybody else facing this?

    Cheers,
    ku



    ------------------------------
    Hans-Dieter Kutz
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  • 2.  RE: Disk VIOS High CPU Load

    Posted Mon June 21, 2021 01:40 AM
    Hi,

    We don't have separate disk/network VIOSes, but both in same; Dual VIOS setup each frame, and we use always Dedicated (Donating) CPUs for VIOSes (2 CPUs per VIOS)

    Example output from E980 system with around 40 AIX lpars behind VIOSes

    Name           PID  CPU%  PgSp Owner          

    seaproc     7668206  0.3 1.00M root            

    emfc_kpr    2621782  0.1 3.44M root             

    seaproc     7537130  0.1 1.00M root                            

    seaproc     7995896  0.1 1.00M root                        

    seaproc     8847634  1.0 1.00M root             

    npivK3      4587920  0.1  512K root 


    # uptime

      08:37AM   up 458 days,  19:03,  1 user,  load average: 1.02, 1.31, 1.34


    # ioslevel

    3.1.1.10




    ------------------------------
    Tommi Sihvo, Lead Service Architect
    TietoEVRY, Compute Services
    email tommi.sihvo@tieto.com mobile +358 (0)40 5180 Finland
    ------------------------------