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IV56854: HIGH CPU UTILIZATION IN AHA_THREAD_QUEUE APPLIES TO AIX 7100-03

A fix is available

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • The ahaqueue process of CAA on VIOS SSP consumes high CPU
    utilization about 60%.
    
    io_delay and get_nextseq function in ahaqueue proc takes
    high CPU resource.
    
    Subroutine       %   Source
    ==========    ====== ======
    .io_delay     47.81
    ../../../../../../src/bos/kernel/lib/
                         libsysp/iodelay.c
    .get_nextseq  11.05
    ../../../../../src/bos/kernel/cluster/
                         kbase_kernext_services.c
    

Local fix

Problem summary

  • High cpu utilization seen in io_delay() and get_nextseq(), no
    further processing of AHAFS events
    

Problem conclusion

  • Fixed algorithm that processed AHAFS events to allow for the
    case that an AHAFS event was missed, which previously caused
    an infinite loop.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV56854

  • Reported component name

    AIX V7.1

  • Reported component ID

    5765H4000

  • Reported release

    710

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Submitted date

    2014-03-19

  • Closed date

    2014-03-19

  • Last modified date

    2016-05-10

  • APAR is sysrouted FROM one or more of the following:

    IV56484

  • APAR is sysrouted TO one or more of the following:

Fix information

  • Fixed component name

    AIX V7.1

  • Fixed component ID

    5765H4000

Applicable component levels

  • R710 PSY U858978

       UP14/05/22 I 1000

PTF to Fileset Mapping



Document information

More support for: AIX Enterprise Edition

Software version: 710

Operating system(s): AIX

Reference #: IV56854

Modified date: 10 May 2016