Solution : https://service.sap.com/sap/support/notes/1387644 (SAP Service marketplace login required)
Summary :
Regarding SAP on AIX systems, from AIX 5.3 TL 04 and later versions, support for 64 KB memory page sizes has been included, which can offer performance benefits by optimizing TLB usage. Applications particularly those with high memory utilization can leverage this feature. Using LDR_CNTRL environment variable, the page size can be set to 64K for various memory sectors — ensuring a consistent page size across all memory regions is recommended for SAP environments. Implementing this requires updating the SAP start profile and a system restart. Limitations exist with Active Memory Sharing and Expansion where 64K pages are currently unsupported or not recommended.
Key words :
setenv_03 = ldr_cntrl=datapsize=64k@textpsize=64k@stackpsize=64k@shmpsize=64k3, ldr_cntrl=datapsize=64k@textpsize=64k@stackpsize=64k@shmpsize=64ksap, terms medium pages ldr_cntrl 64k reason, command 'svmon -mlrp <pid> > <output-file>', applications repeatedly accessing large amounts, page size statisticspage size usage, instance profile parameter es/table, sap jvm 64k pages, vmstat command displays memory statistics, displays global vmstat information
Related Notes :
| 1775923 | liveCache on AIX |
| 1024539 | Recommended Settings for NW04 >= SP14, NW 7.0 >= SP6 on AIX |
| 1008311 | Recommended Settings for NW 7.0 >= SR2 for the AIX JVM (J9) |