I'm trying to test Oracle 10gR2 RAC on a two-node 8G SUSE SLES9 64-bit
cluster (2.6.5-7.201-smp). Under 9i 32-bit Redhat AS3, we used
hugepages for our SGA. It appears that hugepages is still available,
but I'm not getting consistent results...



SQL> show sga



Total System Global Area 5368709120 bytes

Fixed Size            2028312 bytes

Variable Size         939527400 bytes

Database Buffers      4412407808 bytes

Redo Buffers          14745600 bytes



But, /proc/meminfo shows...



HugePages_Total: 2624

HugePages_Free:  2170

Hugepagesize:   2048 kB



(roughly 900MB of hugepages in use)



ipcs shows...

0x8e2a3750 1671179   oracle   600     5370806272 24


0x53495350 1703948   oracle   664     37376    25



Why is only 900MB of the SGA going into hugepages?



How do I get the entire SGA into hugepages like I did under 9i (32-bit)?



Redhat 3 64-bit default size of a hugepage is 256MB, but SLES9 64-bit is
reporting only 2MB...is this correct? Is the default standard page size
4k on 64-bit SLES9?



Thanks

Jason