We observed, while using STROBE, apparent high CPU use in module CAS9C66.
From CA we found that they had the following on file::
APAR #: RO43562
Product: ENFCIC Release: 14.0 Solution #: 7 Type:
OS: OS Group: GCCOMC ISL SUP 2
Title: PERFORMANCE ENHANCEMENT ON Z/196 PROCESSORS.
****************** VERSION 0 EFFECTIVE: MAR 31 2012 2:09
******************
***NOTE*** PE: YES CORRECTED BY: RO45646
PROBLEM DESCRIPTION:
After a processor upgrade to z/196, some performance monitors may
show increase cpu usage in various csects in the CAS9Cxx module.
The flagged area is usually in a very tight range and will contain
a SPKA instruction. This APAR will have a greater affect on regions
running STGPROT=NO.
SYMPTOMS:
Performance monitors show increased activity in CAS9Cxx modules.
We had just moved to a z196 and STROBE was being used to compare performance
against the previous processor (no longer available for direct comparison).
Since the z196 and z114 are from the same design cycle and zEC12 is similar to
a z196 we have asked whether this situation could exist on a z114 or a zEC12
and they said no.
Has anyone any idea why this might occur, and anyone has seen it on a z114 or
zEC12.
Is the set up code for a SPKA instruction something that would be very
different on a z196 from any other processor?
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