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PQ65699: INEFFICIENT USE OF STORAGE DURING IP REASSEMBLY

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APAR status

  • Closed as program error.

Error description

  • Inefficient use of CSM storage by the TCP/IP stack code
when receiving out of order IP fragments.
During packet reassembly storage may be retained over too
long a period using the current algorithm.

Local fix

  •

Problem summary

  • ****************************************************************
* USERS AFFECTED: All users of the IBM Communications Server   *
*                 for OS/390 Release 10 IP and z/OS Version 1  *
*                 Release 2 IP                                 *
****************************************************************
* PROBLEM DESCRIPTION: Storage is being used inefficiently     *
*                      under certain reassembly conditions in  *
*                      the TCP/IP stack.                       *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
Inefficient use of CSM storage under certain reassembly
conditions in the TCP/IP stack.
+-------------------------------------------------------------+
+ Please check our Communications Server for OS/390 homepages +
+ for common networking tips and fixes.  The URL for these    +
+ homepages can be found in Informational APAR II11334.       +
+-------------------------------------------------------------+

Problem conclusion

  • TCP/IP stack code has been modified to use a hashing algorithm
in the area of IP reassembly to be more efficient.

* Cross Reference between External and Internal Names

Temporary fix

  •

Comments

  •

APAR Information

  • APAR number

    PQ65699

  • Reported component name

    TCP/IP V3 MVS

  • Reported component ID

    5655HAL00

  • Reported release

    50A

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2002-08-28

  • Closed date

    2002-09-24

  • Last modified date

    2002-11-03

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

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

    UQ70112 UQ70113

Modules/Macros

  •    EZBIPINB EZBIPSTR EZBUDBYP TOIPMAIN TOIPRSM
TPSTMSG1

Fix information

  • Fixed component name

    TCP/IP V3 MVS

  • Fixed component ID

    5655HAL00

Applicable component levels

  • R120 PSY UQ70112

       UP02/10/15 P F210

  • R50A PSY UQ70113

       UP02/10/15 P F210

Fix is available

  • Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.

[{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SSSN3L","label":"z\/OS Communications Server"},"Platform":[{"code":"PF054","label":"z\/OS"}],"Version":"50A","Line of Business":{"code":"LOB35","label":"Mainframe SW"}}]

Document Information

Modified date:
28 March 2021

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