Solution : https://service.sap.com/sap/support/notes/789477 (SAP Service marketplace login required)
Summary :
This SAP Note addresses performance issues in 64-bit R/3 systems operating on AIX due to extended memory bottlenecks particularly with numerous user contexts. Solutions provided include changing instance profile configurations such as setting ES/TABLE and ES/SHM_SEG_SIZE for alternative extended memory management, alongside warnings against setting PSALLOC=EARLY which may exacerbate issues. The note specifies memory configurations for different system requirements to optimize extended memory volume and offers parameters adjustments like EM/TOTAL_SIZE_MB and ztta/roll_extension to prevent swapping issues, ensuring stable system operation under high memory load.
Key words :
ztta/roll_extension = es/shm_max_priv_segs es/shm_seg_size 1024 1024if, es/shm_proc_seg_count es/shm_seg_size mb, ztta/roll_extension profile parameter, terms tsv_tnew_page_alloc_failed memory_parameters_wrong_set reason, 'sappfpar check pf=<profile>', virtual 256 mb em blocks, shared memory segments created, separate shared memory segment, shmd pf=<profile>', shared memory segments
Related Notes :
| 1460067 | ST-SER 2010_1 SP2: GL1_R3CONF Corrections |
| 923610 | Memory parameter recommendations for banking systems |
| 808607 | iSeries: Memory management in a system based on PASE |
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| 445533 | Lots of extended memory on AIX (64 bit) |
| 329021 | SPOOL_INTERNAL_ERROR, ERROR => EmIAllocMmResourceEg |
| 191801 | AIX 64-bit with very large amount of Extended Memory |
| 146289 | Parameter Recommendations for 64-Bit SAP Kernel |
| 118546 | esSHMAllocateBlock returned 16 under AIX |