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VM65998: POLLING TOO FREQUENT WHEN CRYPTO IS INACTIVE

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

  • VM65716 altered the limits for frequency of polling for CRYPTO
    activity. The maximum polling interval allowed was decreased
    resulting in more frequent polling and higher system overhead
    when there is little to no CRYPTO activity.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: ALL USERS OF Z/VM                            *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    ****************************************************************
    * RECOMMENDATION: APPLY PTF                                    *
    ****************************************************************
    Code was added with APAR VM65716 to change the minimum and
    maximum delay times for tasks which process crypto hardware
    functions. The maximum delay time was reduced, which affects
    performance of z/VM systems which are not using crypto hardware.
    z/VM systems without crypto hardware will have better
    performance with the maximum delay time which was used prior
    to VM65716.
    

Problem conclusion

  • HCPKAU is changed to restore the maximum crypto delay time to
    its value prior to VM65716.
    

Temporary fix

  • FOR RELEASE VM/ESA CP/ESA R630 :
    PREREQ: VM65716
    CO-REQ: NONE
    IF-REQ: NONE
    FOR RELEASE VM/ESA CP/ESA R640 :
    PREREQ: NONE
    CO-REQ: NONE
    IF-REQ: NONE
    

Comments

APAR Information

  • APAR number

    VM65998

  • Reported component name

    VM CP

  • Reported component ID

    568411202

  • Reported release

    630

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2017-02-13

  • Closed date

    2017-02-20

  • Last modified date

    2017-08-25

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

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

    UM35037 UM35038

Modules/Macros

  • HCPKAU
    

Fix information

  • Fixed component name

    VM CP

  • Fixed component ID

    568411202

Applicable component levels

  • R630 PSY UM35037

       UP17/08/25 P 1701 ¢

  • R640 PSY UM35038

       UP17/02/21 P 1701 ¢

Fix is available

  • Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.



Document information

More support for: z/VM family

Software version: 630

Operating system(s): z/VM

Reference #: VM65998

Modified date: 25 August 2017