A fix is available
APAR status
Closed as program error.
Error description
On a system with large number of CPUs and relatively low maximum memory, PTEs for MTRC buffers might collide on the same PTEGs resulting in frequent PTE evictions.
Local fix
Problem summary
On a system with large number of CPUs and relatively low maximum memory, PTEs for MTRC buffers might collide on the same PTEGs resulting in frequent PTE evictions.
Problem conclusion
Stagger the start of MTRC buffers such that the PTEs are spread across Hardware Page Table to minimize PTEG collisions.
Temporary fix
Comments
6100-09 - use AIX APAR IV99018 6100-09 - use AIX APAR IV99018 7100-05 - use AIX APAR IV99184 7100-05 - use AIX APAR IV99184 7200-02 - use AIX APAR IV98975
APAR Information
APAR number
IV98975
Reported component name
AIX V7.2
Reported component ID
5765CD200
Reported release
720
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Submitted date
2017-08-14
Closed date
2017-08-14
Last modified date
2018-09-21
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
AIX V7.2
Fixed component ID
5765CD200
Applicable component levels
R720 PSY U878550
UP17/10/30 I 1000
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Document Information
Modified date:
10 September 2025