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PI20830: WEBSPHERE ON-DEMAND ROUTER QUEUES REQUESTS UNNECESSARILY WHEN USING MAXIMUM CPU ENTITLEMENT GREATER THAN 100% ON AIX

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • When an AIX LPAR is configured with a maximum CPU entitlement
    greater than 100%, WebSphere Virtual Enterprise On-Demand
    Router may queue too many requests, keeping
    CPU utilization lower than necessary on the nodes with maximum
    CPU entitlement greater than 100%
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:  Users of WebSphere Virtual Enterprise       *
    *                  v7.0.0                                      *
    *                  and later.                                  *
    ****************************************************************
    * PROBLEM DESCRIPTION: Excessive queueing at On-Demand         *
    *                      Router when AIX LPAR's maximum CPU      *
    *                      entitlement exceeds 100%.               *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    On AIX, it is possible to configure the CPU entitlement of an
    LPAR to exceed 100%. When one does so, the autonomous
    request flow manager (ARFM) in WebSphere Virtual Enterprise's
    On-Demand Router (ODR) may queue requests excessively,
    resulting in underutilization of the LPARs.
    

Problem conclusion

  • The fix for this issue modifies autonomous request flow
    manager to not queue requests excessively when the downstream
    LPAR's CPU entitlements exceed 100%.
    

Temporary fix

Comments

APAR Information

  • APAR number

    PI20830

  • Reported component name

    WAS VIRTUAL ENT

  • Reported component ID

    5725C9203

  • Reported release

    700

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2014-06-26

  • Closed date

    2014-07-23

  • Last modified date

    2014-07-23

  • 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

    WAS VIRTUAL ENT

  • Fixed component ID

    5725C9203

Applicable component levels

  • R700 PSY

       UP

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Document Information

Modified date:
28 April 2022