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PI85595: PERFORMANCE ISSUE WITH SIB LINK CONNECTION WHEN TRANSFERRING LARGE MESSAGES FROM ONE CELL TO ANOTHER CELL

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APAR status

  • Closed as program error.

Error description

  • When using SIB Link to transfer messages from one cell to
    another one,  if the message is large or a mix of message
    priorities are used, performance issue is observed. Messages
    will be sliced into chunks and the order could be disrupted,
    which might cause receiver unable to reconstruct the message.
    

Local fix

  • N/A
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  Users of IBM WebSphere Application          *
    *                  Server who have applications that           *
    *                  are sending large messages with a mixture   *
    *                  of different priorities.                    *
    ****************************************************************
    * PROBLEM DESCRIPTION: Throughput performance can be reduced   *
    *                      as the frequency of different           *
    *                      priority messages increases.            *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    If large messages (which will be sent as a number of segments)
    are sent with varying priorities, then parts of the higher
    priority messages can "overtake" parts of lower priority
    messages when being sent from the client ro the Messaging
    Engine. This can result in some messages being delayed as they
    have to be resent after the segment sequence is interrupted.
    The resends can make the problem worse, so the problem can
    become exacerbated over time.
    

Problem conclusion

Temporary fix

Comments

APAR Information

  • APAR number

    PI85595

  • Reported component name

    WEBS APP SERV N

  • Reported component ID

    5724H8800

  • Reported release

    850

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2017-08-08

  • Closed date

    2018-03-14

  • Last modified date

    2018-03-14

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

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

Fix information

  • Fixed component name

    WEBS APP SERV N

  • Fixed component ID

    5724H8800

Applicable component levels

  • R850 PSY

       UP

  • R900 PSY

       UP

[{"Business Unit":{"code":"BU053","label":"Cloud \u0026 Data Platform"},"Product":{"code":"SSEQTP","label":"WebSphere Application Server"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"850","Line of Business":{"code":"LOB36","label":"IBM Automation"}}]

Document Information

Modified date:
19 October 2021