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

Fixes are available

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

[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSUP64","label":"WebSphere Virtual Enterprise"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"7.0","Line of Business":{"code":"LOB45","label":"Automation"}}]

Document Information

Modified date:
28 April 2022

Tips

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

Fixes are available

Subscribe

APAR status

Closed as program error.

Error description

Local fix

Problem summary

Problem conclusion

Temporary fix

Comments

APAR Information

APAR number

Reported component name

Reported component ID

Reported release

Status

PE

HIPER

Special Attention

Submitted date

Closed date

Last modified date

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

Fixed component ID

Applicable component levels

R700 PSY

Document Information

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