IBM Support

IJ57887: SHAENTDD LOGS SHAENT_SW_ER WHEN IT TRANSMITS SMALL MSS PACKET APPLIES TO AIX 7300-03

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APAR status

  • Closed as program error.

Error description

  • The shientdd driver logs SHAENT_SW_ERR and reset the
adapter when it tries to transmit the packets with
largesend enabled with small MSS going from vio client
lpar to the remote host.

Local fix

  • 



Problem summary


    

  • Network connection timeouts

    



Problem conclusion


    

  • Using an odm tunable we can either drop packets with mss size
less than 64byes or adjust the MSS to the minimum value
supported by the adapter.

    



Temporary fix


    

  • 



Comments


    

  • 



APAR Information




    

  • APAR number
    IJ57887
    • 

  • Reported component name
    VIRTUAL I/O SER
    • 

  • Reported component ID
    5765G3400
    • 

  • Reported release
    410
    • 

  • Status
    CLOSED  PER
    • 

  • PE
    NoPE
    • 

  • HIPER
    NoHIPER
    • 

  • Special Attention
    NoSpecatt / Xsystem
    • 

  • Submitted date
    2026-04-08
    • 

  • Closed date
    2026-04-09
    • 

  • Last modified date
    2026-08-24
    • 





    

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

    • 

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

    
IJ58295 IJ58301 IJ58343
    

    • 



Fix information


    

  • Fixed component name
    VIRTUAL I/O SER
    • 

  • Fixed component ID
    5765G3400
    • 



Applicable component levels


    








      
              
                            

              

              [{"Business Unit":{"code":"BU029","label":"Software"},"Product":{"code":"SSAVPM","label":"PowerVM VIOS Standard Edition"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"410"}]
              

                                                                    

          
 
        

      

    

      

        

          

            
Document Information


            

            


                        

            Modified date:
            

            24 August 2026
            

            
                      

        


        

        


      

    

  



    

  

  
    
            

          
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