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IZ99502: 10GB DRIVER PERFORMANCE DEGRADES WITH LARGE_RECEIVE AND IPSEC APPLIES TO AIX 7100-01

A fix is available

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • Performance degradation occurs on 10Gb adapters when the
    large_receive attribute and IPSEC are enabled. By
    default,
    large_receive is enabled on AIX 5.3 TL9 causing this
    issue
    to surface after an upgrade.
    
    Simple FTP throughput on the 10Gb adapter has been
    observed at 300Kb/sec and in some cases actually appeared
    to hang.
    
    The work-around for this issue is to turn OFF
    large_receive, IPSEC or chksum_offload.
    

Local fix

Problem summary

  • Performance degradation occurs on 10Gb adapters when the
    large_receive attribute and IPSEC are enabled.
    

Problem conclusion

  • If IPSec is enabled and adapter has already checked the
    checksum, TCP won't check checksum again and drop the packets
    due to bad checksum.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IZ99502

  • Reported component name

    AIX V7.1

  • Reported component ID

    5765H4000

  • Reported release

    710

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Submitted date

    2011-04-27

  • Closed date

    2011-04-27

  • Last modified date

    2013-03-24

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

    IZ65672

  • 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 U838091

       UP11/10/05 I 1000

PTF to Fileset Mapping

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Document Information

Modified date:
24 March 2013