IZ15692: PAGING OUT TO PGSPACE OF MEDIUM PAGES APPLIES TO AIX 5300-08

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

  • When real memory is exhausted on a P5+ or P6 machine with the
    64-bit kernel, AIX page replacement may page out computational
    64K pages instead of non-computational file cache pages in some
    rare cases.  This can lead to an increase in paging space
    consumption even when there is sufficient file cache available
    for page replacement.
    

Local fix

Problem summary

  • When real memory is exhausted on a P5+ or P6 machine with the
    64-bit kernel, AIX page replacement may page out computational
    64K pages instead of non-computational file cache pages in
    some rare cases.  This can lead to an increase in paging space
    consumption even when there is sufficient file cache available
    for page replacement.
    

Problem conclusion

  • Enhance page size management daemons to more aggressively
    target the file cache when there is a strong demand for 64K
    pages.
    

Temporary fix

Comments

  • 5300-08 - use AIX APAR IZ15692
    5300-09 - use AIX APAR IZ08649
    6100-01 - use AIX APAR IZ17835
    

APAR Information

  • APAR number

    IZ15692

  • Reported component name

    AIX 5.3

  • Reported component ID

    5765G0300

  • Reported release

    530

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Submitted date

    2008-02-15

  • Closed date

    2008-02-15

  • Last modified date

    2008-11-17

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

    IZ08649

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

    U817754

Fix information

  • Fixed component name

    AIX 5.3

  • Fixed component ID

    5765G0300

Applicable component levels

  • R530 PSY U817754

       UP08/04/22 I 1000



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Document information


More support for:

AIX family

Software version:

530

Operating system(s):

AIX

Reference #:

IZ15692

Modified date:

2008-11-17

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