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IV12424: LARGESEND FLAG ON SMALL PACKETS CAN CAUSE ADAPTER TO MISBEHAVE APPLIES TO AIX 6100-06

A fix is available

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APAR status

  • Closed as program error.

Error description

  • When largesend is enabled on the SEA and the LPAR
    clients,
    turning off largesend on one of the clients created
    DUP-ACK
    storm on the switch. This seems to be generated by the
    adapter
    hardware when the TX packet is small, but largesend flag
    set.
    

Local fix

  • Turning off largesend on the SEA should avoid this
    problem.
    

Problem summary

  • DUP-ACK storm on the switch
    

Problem conclusion

  • Code is modified to use largesend appropriately on the above
    mentioned scenario
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV12424

  • Reported component name

    AIX 610 STD EDI

  • Reported component ID

    5765G6200

  • Reported release

    610

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Submitted date

    2011-12-20

  • Closed date

    2012-01-13

  • Last modified date

    2013-02-27

Fix information

  • Fixed component name

    AIX 610 STD EDI

  • Fixed component ID

    5765G6200

Applicable component levels

  • R610 PSY U852450

       UP12/06/15 I 1000



Document information

More support for: AIX Standard Edition

Software version: 610

Operating system(s): AIX

Reference #: IV12424

Modified date: 27 February 2013