PM85944: RETROFIT 1M PAGEABLE FRAME ALLOCATION FOR PMBS TO EXPLOIT ZEC12 LARGE PAGE SUPPORT

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APAR status

  • Closed as program error.

Error description

  • Retrofit 1M pageable frame allocation for PMBs to exploit zEC12
    large page support. FIXCAT - E2827/K
    

Local fix

  • n/a
    

Problem summary

  •   USERS AFFECTED: All DB2 users.
    
      PROBLEM DESCRIPTION: Added 1MB pageable support to exploit
                           zEC12 and Flash Express hardware
                           features.
    
      RECOMMENDATION:
    
    With zEC12 and Flash Express installed, DB2 will exploit the
    Large Page support by allocating internal control blocks (PMBs
    using 1MB pageable storage. These large pages may be paged to
    and from Flash Express and performance may be improved due to a
    reduction in TLB misses and an increase in TLB hit rate.
    

Problem conclusion

  • In order for DB2 to use 1MB pageable Large Page hardware
    features, all of the following must be true:
    
    - zEC12 (2827
    - Flash Express
    - z/OS V1R13 and above with requisite PTFs (FMID JBB778H
    

Temporary fix

Comments

APAR Information

  • APAR number

    PM85944

  • Reported component name

    DB2 OS/390 & Z/

  • Reported component ID

    5740XYR00

  • Reported release

    A10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-03-29

  • Closed date

    2013-06-03

  • Last modified date

    2013-06-18

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

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

    UK94810

Modules/Macros

  • DSNB1ABS
    

Fix information

  • Fixed component name

    DB2 OS/390 & Z/

  • Fixed component ID

    5740XYR00

Applicable component levels

  • RA10 PSY

       UP



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Document information


More support for:

DB2 for z/OS

Software version:

A10

Reference #:

PM85944

Modified date:

2013-06-18

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