OA07510: NEW FUNCTION D/T2084 D/T2094

Obtain the fix for this APAR.

APAR status

• Closed as new function.

Error description

• New Function
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of z/OS 1.4 (HBB7707) and          *
  *                 above.                                       *
  ****************************************************************
  * PROBLEM DESCRIPTION: Some hardware allows to modify the      *
  *                      system performance by changing the      *
  *                      processor speed. However, this requires *
  *                      an IPL to allow the system to set       *
  *                      timing and performance specific values. *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  At ipl time, SRM sets the RMCTADJC field based on the CPU
  adjustment factor and mp factors and then calculates other
  corresponding fields.  These values do not change after IPL
  because the processor speed was assumed to be constant.
  
  The z890 processor now allows for a dynamic CPU capacity upgrade
  based on processor speed change.  The processor speed can be
  increased or decreased.  Prior to this support, a processor
  speed change required an IPL to make the new speed known to the
  system.  Now, the z890 hardware will notify the operating system
  of a speed change by generating a repressible machine check with
  a sub-code describing the interrupt reason.  An ENF signal
  notifies any listeners of the change.  SRM/WLM must now react to
  the non-disruptive processor speed change.
  
  A processor speed change can also occur when a z990 processor
  goes into cycle steering mode.
  

Problem conclusion

Temporary fix

Comments

• The z890 supports dynamic processor speed changes and signals
  this event to the operating system.  For this type of hardware,
  a dynamic processor speed change can be done from the service
  element to change the performance of the system.  An IPL will
  not be required.  SRM now listens for the ENF signal.  Module
  IRAEVSSI has been updated to dynamically adjust the timing and
  performance related values that are based on the speed of the
  processor, such as the RMCTADJC field.  When a speed change
  occurs, the WLM policy will be reactivated and a new message
  will be issued to the console, IWM063I WLM POLICY WAS REFRESHED
  DUE TO A PROCESSOR SPEED CHANGE.
  
  Hardware which has the capability to change the processor speed
  but does not signal this event to the operating system continues
  to require an IPL to make the change effective.
  
  The method of modifying the system performance by changing the
  number of processors remains unchanged and is not affected by
  this APAR.
  
  z/VM 5.1 will support dynamic processor speed changes.  If z/OS
  runs as guest on an earlier z/VM release, an IPL is still
  required.
  
  There are no parameters that can be set by a user for this new
  function.
   **** PE05/06/02 PTF IN ERROR. SEE APAR OA12155  FOR DESCRIPTION
  

APAR Information

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

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

  UA15126 UA15127 UA15128 UA15145 UA15146 UA15147 UA15151 UA15152

Modules/Macros

• IEAVNP10 IRAENF20 IRAEVENT IRAEVSSI IRARMCT
  IRARMCTY IRARMERR IRASSISA IWMO2MST IWMPMCT  IWMP2RAC IWMP2SET
  IWMP2TSK IWMWLMEN IWMWLMJP IWMYMDEF SYSEVENT
  

Publications Referenced

SA22763906

SA22763907

SA22763908

Fix information

• Fixed component name

  5752 SYS RSRCE

• Fixed component ID

  5752SC1CX

Applicable component levels

• R7J7 PSY UA15145

     UP04/11/23 P F411

• R7J8 PSY UA15146

     UP04/11/23 P F411

• R7J9 PSY UA15147

     UP04/11/23 P F411

• R7K7 PSY UA15151

     UP04/11/24 P F411

• R707 PSY UA15126

     UP04/11/23 P F411

• R708 PSY UA15127

     UP04/11/23 P F411

• R709 PSY UA15128

     UP04/11/23 P F411

• R717 PSY UA15152

     UP04/11/24 P F411

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.

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Product categories:

Software

Operating System

z/OS family

APARs - z/OS environment

Operating system(s):

MVS, z/OS

Software version:

709

Reference #:

OA07510

IBM Group:

IBM Server Group

Modified date:

2005-11-22