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MF53059 - OSP-PERFM CPU CONSUMED WAITING ON TIMERS

PTF Cover Letter


PTF ( Program Temporary Fixes ) Cover letter


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Abstract

OSP-PERFM CPU CONSUMED WAITING ON TIMERS


Pre/Co-Requisite PTF / Fix List

REQ  LICENSED      PTF/FIX  LEVEL

TYPE PROGRAM  REL  NUMBER   MIN/MAX  OPTION
---- -------- ---  -------  -------  ------
NONE



NOTICE:
-------
Application of this PTF may disable or render ineffective programs that
use system memory addresses not generated by the IBM translator,
including programs that circumvent control technology designed to limit
interactive capacity to purchased levels.  This PTF may be a prerequisite
for future PTFs.  By applying this PTF you authorize and agree to the
foregoing.

This PTF is subject to the terms of the 'IBM License Agreement for Machine
Code', the terms of which were provided in a printed document that was
delivered with the machine.

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AGREEMENT, IBM MAKES NO WARRANTIES OR CONDITIONS EITHER EXPRESS OR IMPLIED,
INCLUDING BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OR CONDITIONS OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON INFRINGEMENT,
REGARDING THE PTF.





APAR Error Description / Circumvention

-----------------------------------------------
After a R710 upgrade on a system with 1 cpu, CHGLIBL and
ADDLIBLE are waiting for a timer for up to 30 minutes at a time.
During the problem timeframe, RMTMSAFEtask is using a bit of the
processor, this CPU burn continues as it waits to get a fair
seize. VL0406010C is also seen typically towards the end of the
problem timeframe.

CORRECTION FOR APAR MA40903 :
-----------------------------
New R710 function added a flow to wait for a lock request that
was inhibited by

a conflicting seize on that address. This timer flow was enough
to flood the LIC

task responsible for managing these timers. That task has a very
high priority

on the system and can consume a single processor partition.



This routine will be redesigned to avoid these timers during
seize conflict

resolution.

CIRCUMVENTION FOR APAR MA40903 :
--------------------------------
None.


Activation Instructions


None.




Special Instructions


None.


Default Instructions

THIS PTF CAN BE APPLIED IMMEDIATE OR DELAYED.



Supersedes

PTF/FIX NO(S).  APAR TITLE LINE
--------------  ------------------------------------------------------------
   MF51606      LIC-OTHER-WAIT HANG CONDITION

Summary Information

System..............................i
Models..............................
Release.............................V7R1M0
Licensed Program...............5770999
APAR Fixed..........................View details for APAR MA40903
Superseded by:......................View fix details for PTF MF99011
Recompile...........................N
Library.............................QSYS
MRI Feature ........................NONE
Cum Level...........................C1270710


System i Support

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Document Information

Modified date:
21 July 2011