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https://www.ibm.com/support/knowledgecenter/en/ssw_aix_72/v_commands/vmo.html?origURL=ssw_aix_72/com.ibm.aix.cmds6/vmo.htm
This is an advisory setting. Support for 64 KB pages is provided by POWER5+ and later machines and used when vmm_mpsize_support is enabled. The 16 MB pages, provided by POWER4 and later machines, should only be used for the kernel heap under high performance environments.
https://www.ibm.com/support/docview.wss?uid=isg1IV43647
IV43647: ADD DESCRIPTION FOR VALUE 3 IN VMO -H VMM_MPSIZE_SUPPORT APPLIES TO AIX 7100-03. A fix is available. Obtain the fix for this APAR. Subscribe. You can track all active APARs for this component. ... The vmo help text for "vmm_mpsize_support" does not mention a value of "3". Problem conclusion. Add documentation for this value to the vmo ...
http://www-01.ibm.com/support/docview.wss?uid=isg1IV87800
Prior to AIX 7.2 TL01 with firmware 860+, if 64K pages are enabled in AME environment via restricted tunable vmm_mpsize_support, it might crash the LPAR Problem conclusion Prior to AIX 7.2 TL01 with firmware 860+, if 64K pages are enabled via restricted tunable vmm_mpsize_support, 64K pages will be compressed via software method
http://www-01.ibm.com/support/docview.wss?uid=isg1IZ74258
Aix 6.1 System can crash with following stack trace:- United States ... Tune the following vmo variables to avoid the problem. vmo -p -o vmm_default_pspa=-1 vmo -r -o vmm_mpsize_support=1 Problem summary. System crash in v_stabfault() Problem conclusion.
https://www.experts-exchange.com/questions/28365850/AIX-oracle-memory-issues.html
This Thread is related to the last 2 Q's we have run into a major problem after increasing Oracle SGA from 60GB to 160GB at our prod server. 7.1 11g R2 oarcle no large pages. the difference is as...
https://www.unix.com/unix-for-advanced-and-expert-users/33018-aix-p5-virtual-processors-setting.html
I would suggest that with 4 CPUs then a virtual setting of 8 to 10 virtual will not be a bad thing. However if your TL is 4 (oslevel -s) then turn off the vmm_mpsize_support with the command: # vmo -r -o vmm_mpsize_support=0 # bosboot -a # shutdown -Fr Hope this helps!
https://mjoulel.github.io/project/lrgPg.html
vmo -L vmm_mpsize_support. To enable 16 MB large pages on AIX (if they are supported on your system): vmo -r -o lgpg_regions=-o lgpg_size=16777216 shutdown -Fr. To enable 16 GB large pages: - On the managed system, go to: Properties Memory Advanced Options Show Details to change the number of 16 GB pages.
https://community.oracle.com/thread/663633
Nov 10, 2007 · purpose -----[ 소개 ] 이 문서는 aix os 환경에서 5.1 을 사용하다가 5.2 ml04 이상 또는 5.3 ml01 이상으로 올린 경우에 vmm 기능에 따른 성능 저하 문제와 paging issue가 시간이 지남에 따라 빈번히 발생하여 운영에 문제를 야기시키는 경우, 원인 분석 및 사례를 통해 해결책을 제시하는 내용입니다.
https://www.unix.com/aix/250500-high-paging-when-lots-free-memory-aix-5-3-a.html
I am new to AIX, I have few AIX 5.3 ... _lgpgs_vmpool = 0 spec_dataseg_int = 512 strict_maxclient = 1 strict_maxperm = 0 v_pinshm = 0 vm_modlist_threshold = -1 vmm_fork_policy = 1 vmm_mpsize_support = 1 wlm_memlimit_nonpg = 1 ... maybe because this is unix question and not linux. I'm posting the same thread here, hope I can get an answer from ...
https://it.toolbox.com/question/psmd-in-aix-61-030411
# vmo -r -o vmm_mpsize_support=0 Then, you need reboot AIX 2. Reset CUR's value # vmo -r -o vmm_mpsize_support=<CURS's value> Then, you need reboot AIX , let me know if you try it , psmd activity could stop or not
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