in Solaris 10 you should disable the 1 GB Pagesize by yourself. Otherwise an Oracle-DB just takes a lot of time to allocate memory and runs really slow. It's a known Bug: System Administration Issues and Bugs - Oracle Solaris 10 1/13 Release Notes (No.15807808)
Seems like they didn't fixed the problem in Solaris 11 (I didn't tried it yet), so its just smart to disable 1 GB pagesizes by default.
Thanks for the reply. Fortunately (or not ) I'm not using a CPU with 1 GB pages…
Anyway, I've put the following lines in /etc/system
set segkmem_lpsize = 0x200000
set auto_lpg_disable = 0
to make use of 2 MB pages (kernel and user land).
PS: Some programs like squid get auto-promoted to 2 MB pages (while others need some help via ppgsz -o heap=2M -p $pid)…
email@example.com:~# pmap -s $(pgrep squid) | grep heap
083DC000 144K 4K rw--- [ heap ]
08400000 100352K 2M rw--- [ heap ]
Not as easy as transparent huge pages on Linux, but still better than 4k pages only