IBM Support

MA44475 - OSP-PERFM MEMORY POOL MANAGEMENT DEFECT RESULTING IN PAGE
STEALING AND EXCESSIVE CPU USAGE.

Subscribe to this APAR

By subscribing, you receive periodic emails alerting you to the status of the APAR, along with a link to the fix after it becomes available. You can track this item individually or track all items by product.

Notify me when this APAR changes.

Notify me when an APAR for this component changes.

 APAR (Authorized Program Analysis Report)

Abstract

OSP-PERFM MEMORY POOL MANAGEMENT DEFECT RESULTING IN PAGE
STEALING AND EXCESSIVE CPU USAGE.

Error Description

algorithm used for memory management can effect performance.    

Problem Summary

****************************************************************
* PROBLEM: (MA44475) Licensed Program = 5770999 for i 7.2      *
*           Severe Performance Degradation                     *
****************************************************************
* USERS AFFECTED: All IBM i operating system users.            *
****************************************************************
* RECOMMENDATION: Apply LIC PTF MF59902 for i 7.2.             *
****************************************************************
QPFRADJ can not move memory fast enough to prevent excessive    
paging in some memory pools.  The reason is that the page move  
algorithm has left the memory pools with too little memory on  
some nodes to allow efficient movement of memory from one pool  
to another.                                                    

Problem Conclusion

The code is corrected to move memory such that the physical    
makeup of a pools memory matches the partitions physical memory
layout. This will allow for the most efficient movement of      
memory from one pool to another.                                

Temporary Fix

Comments

Circumvention


PTFs Available

R720 MF59845 PTF Cover Letter   5135

Affected Modules

         
         

Affected Publications

Summary Information

Status............................................ CLOSED PER
HIPER........................................... Yes
Component.................................. 9400DG300
Failing Module.......................... RCHMGR
Reported Release................... R720
Duplicate Of..............................




System i Support

IBM disclaims all warranties, whether express or implied, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose. By furnishing this document, IBM grants no licenses to any related patents or copyrights. Copyright © 1996,1997,1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017 IBM Corporation. Any trademarks and product or brand names referenced in this document are the property of their respective owners. Consult the Terms of use link for trademark information

[{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SG15Q","label":"APARs - OS\/400 General"},"Component":"","ARM Category":[],"Platform":[{"code":"PF012","label":"IBM i"}],"Version":"V7R2M0","Edition":"","Line of Business":{"code":"","label":""}},{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SG16E","label":"APARs - IBM i 7.2 environment"},"Component":"","ARM Category":[],"Platform":[{"code":"PF012","label":"IBM i"}],"Version":"V7R2M0","Edition":"","Line of Business":{"code":"","label":""}}]

Document Information

Modified date:
30 May 2015