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IV23753: SNMPINFO HRPROCESSORLOAD OUTPUT INCORRECT IN SHARED PROC ENV APPLIES TO AIX 7100-02

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APAR status

  • Closed as program error.

Error description

  • snmpinfo hrProcessorLoad metrics are incorrect in a
shared
processor environment for customer upgrades that include:
APAR IZ72006 - HRPROCESSORLOAD DOES NOT MATCH WITH SAR

hrProcessorLoad metrics do not match cpu load reported by
native AIX tools such as topas, vmstat, mpstat, and sar.
In this example, after a cpu spike, snmpinfo
hrProcessorLoad
remained at almost 100% while topas utilization returned
to normal:

snmpinfo hrProcessorLoad:
=========================
Fri Jan 20 12:59:57 EST 2012
bash-3.00# snmpinfo -m dump -v hrprocessorload
hrProcessorLoad.1 = 96
hrProcessorLoad.2 = 98
hrProcessorLoad.3 = 98
hrProcessorLoad.4 = 85
bash-3.00#

Topas:
======
Fri Jan 20 13:01:54 2012   Interval:  2  Cswitch  710
Readch   23787
                                         Syscall  555
Writech50079
CPU  User%  Kern%  Wait%  Idle%  Physc   Entc   Reads
41  Rawin  0
ALL    0.2    0.3    0.0   99.5   0.01    0.7   Writes
6  Ttyout 382

This issue has been reported by customers who upgraded to
5.3 TL12 as well as upgrades to 6.1 TL6 SP3, SP4, SP5

The behavior is specific to shared processor environments
and is not seen with dedicated processors.

Local fix

  • 



Problem summary


    

  • Snmpinfo hrprocessorload value will be high above 90% &
topas/mpstat will show correct values with 20% difference.
Both will have different values reported.

    



Problem conclusion


    

  • Changes made to hostmibd cpu load calculation to considering
all the lpar cpu environments like
donated/shared/capped/uncapped.

    



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IV23753
    • 

  • Reported component name
    AIX V7.1
    • 

  • Reported component ID
    5765H4000
    • 

  • Reported release
    710
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Submitted date
    2012-06-25
    • 

  • Closed date
    2012-06-25
    • 

  • Last modified date
    2013-03-26
    • 





    

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

    
IV16784
    

    • 

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

    • 



Fix information


    

  • Fixed component name
    AIX V7.1
    • 

  • Fixed component ID
    5765H4000
    • 



Applicable component levels


    

  • R710  PSY  U846336
       UP12/10/26  I  1000
    • 



PTF to Fileset Mapping








      
              
                            

              

              [{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SSMV87","label":"AIX 6.1 Enterprise Edition"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"710","Edition":"","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}},{"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SSMVAX","label":"AIX Express Edition"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"710","Edition":"","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}},{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SG11R","label":"AIX 7.1 HIPERS, APARs and Fixes"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"710","Edition":"","Line of Business":{"code":"","label":""}}]
              

                                                                    

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            26 March 2013
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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