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IJ25397: SLOW TCP PERFORMANCE VLAN TAGGED PLATFORM LARGE SEND PACKETS

 

APAR status

  • Closed as duplicate of another APAR.

Error description

  • AIX LPARs using VLAN pseudo-devices configured over
    virtual
    ethernet ports, and observing bad performance when PLSO
    is
    enabled.  Bug is in the virtual ethernet device driver
    receive
    path.  When VLAN-tagged large packets send using PLSO are
    received
    by the driver, an incorrect ethernet header size is
    calculated
    which causes the driver to discard valid large receive
    packets.
    

Local fix

  • Disable PLSO:
    
    Either disable mtu_bypass:
    # chdev -l enX -a mtu_bypass=off
    
    or disable PLSO on the VEA or trunk VEA:
    # chdev -l entX -a platform_lso=no
    

Problem summary

Problem conclusion

Temporary fix

Comments

APAR Information

  • APAR number

    IJ25397

  • Reported component name

    AIX 6.1 EXT SUP

  • Reported component ID

    5765G6299

  • Reported release

    61E

  • Status

    CLOSED DUB

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Submitted date

    2020-06-04

  • Closed date

    2020-06-10

  • Last modified date

    2020-06-10

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

    IJ25390

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

Fix information

Applicable component levels

[{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SSLLZP","label":"AIX Standard Edition"},"Platform":[{"code":"PF053","label":"Power Systems"}],"Version":"61E","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}}]

Document Information

Modified date:
11 June 2020