LI76850: SNA SLOWS DRASTICALLY WHEN ANOTHER PROCESS TAKES CPU

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • Communications Server for Linux on System Z
    -------------------------------------------
    On a multi-processor system, if one or more processors have high
    CPU usage from one or more other processes, the LiS processes of
    Communications Server appear to not get any CPU time, even those
    that are running on processors that are not under high usage.
    This drastically slows SNA communications, and may even cause
    link failures.
    

Local fix

  • Assign only one processor to the system.
    

Problem summary

  • Each LiS process is tied to a specific processor. However, the
    processes communicate with each other, so if one becomes
    CPU-starved, then the rest have to wait on that one, so they all
    appear to become slowed.
    

Problem conclusion

  • Code has been changed to un-tie the LiS processes from specific
    processors. Each LiS process is started with an affinity for a
    specific processor, but is now allowed to float to other
    processors when necessary.
    

Temporary fix

  • LiS patch
    

Comments

APAR Information

  • APAR number

    LI76850

  • Reported component name

    CS LINUX ON ZSE

  • Reported component ID

    5724I3400

  • Reported release

    640

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-07-03

  • Closed date

    2012-07-16

  • Last modified date

    2012-07-16

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

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

    IV24782 LI76907 LI76909

Fix information

  • Fixed component name

    CS LINUX ON ZSE

  • Fixed component ID

    5724I3400

Applicable component levels

  • R640 PSY

       UP



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Document information


More support for:

Communications Server for Linux on zSeries

Software version:

640

Reference #:

LI76850

Modified date:

2012-07-16

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