IBM Support

IT23730: CDSA SUSPEND QUEUE PROCESSING STALLS WHEN THERE ARE OVER 1000 SUSPENDED SESSIONS

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APAR status

  • Closed as program error.

Error description

  • CDSA suspend queue processing appears to stall when there are
over 1000 suspended sessions.

Local fix

  • 



Problem summary


    

  • Users Affected:
All

Problem Description:
In burst scenarios where 1000s of BPs are attempting (at
virtually the same time) to transmit a file from a CDSA (PNODE)
to a remote node (SNODE) which is severely restricted to less
than 5 concurrent sesssions, suspend queue processing appears to
"stall" becuase of the pace at which the queued entries are
resumed.

Platforms Affected:
Unix/Linux
Windows
iSeries

    



Problem conclusion


    

  • Resolution Summary:

A code fix is provided.
Depending on session limit restrictions, burst scenarios can
significantly increase the SHSL suspend queue depth.  Prior to
the fix, the deeper the queue became, the slower its processing
became.   After the fix, queue depth has virtually no impact on
queue processing; performance is significantly improved,
especially in burst scenarios.

Delivered In:
5020500_18
5020601_10
5020602_6
5020603_6

    



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IT23730
    • 

  • Reported component name
    STR B2B INTEGRA
    • 

  • Reported component ID
    5725D0600
    • 

  • Reported release
    525
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2018-01-12
    • 

  • Closed date
    2018-01-17
    • 

  • Last modified date
    2018-07-15
    • 





    

  • 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
    STR B2B INTEGRA
    • 

  • Fixed component ID
    5725D0600
    • 



Applicable component levels


    








      
              
                            

              

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Document Information


            

            


                        

            Modified date:
            

            15 July 2018
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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