Memory on RHEL 3.0

[Yard, John]

I have 2 RHEL 3.0 systems 32 bit systems,
one has 12G of physical memory, the other has 6G.
The systems are at the same rpm levels ,
with the same app running ( Sun LDAP ),
configured identically.

Yet when I do vmstat the memory free is approximately the same .
( Also see free memory in meminfo below ). Am I running
into a 32bit memory usage limitation ? Is there a better way to 
configure the system to use the 12G I have available,
even though this is 32 bit ?

Thks,

Jyard
UCLA


System 1  ( 12G ):
xxx1:/proc] # cat meminfo
        total:    used:    free:  shared: buffers:  cached:
Mem:  12352049152 5887373312 6464675840        0 260145152 5239549952
Swap: 4194848768        0 4194848768
MemTotal:     12062548 kB
MemFree:       6313160 kB
MemShared:           0 kB
Buffers:        254048 kB
Cached:        5116748 kB
SwapCached:          0 kB
Active:        3759360 kB
ActiveAnon:     416024 kB
ActiveCache:   3343336 kB
Inact_dirty:   1352552 kB
Inact_laundry:  405860 kB
Inact_clean:         0 kB
Inact_target:  1103552 kB
HighTotal:    11383680 kB
HighFree:      6106256 kB
LowTotal:       678868 kB
LowFree:        206904 kB
SwapTotal:     4096532 kB
SwapFree:      4096532 kB
Committed_AS:  1553328 kB
HugePages_Total:     0
HugePages_Free:      0
Hugepagesize:     2048 kB

xxx1:/proc] # vmstat 1 5
procs                      memory      swap          io     system
cpu
 r  b   swpd   free   buff  cache   si   so    bi    bo   in    cs us sy
wa id
 0  0      0 6313204 254048 5116804    0    0     0     2    4     3  0
1  0  1
 0  0      0 6313204 254048 5116804    0    0     0     0  321   271  0
0  0 100

System2 ( ^G ) ;

xxx2:/proc] # cat meminfo
        total:    used:    free:  shared: buffers:  cached:
Mem:  6305636352 326402048 5979234304        0 65183744 144285696
Swap: 4194848768        0 4194848768
MemTotal:      6157848 kB
MemFree:       5839096 kB
MemShared:           0 kB
Buffers:         63656 kB
Cached:         140904 kB
SwapCached:          0 kB
Active:         195000 kB
ActiveAnon:      47468 kB
ActiveCache:    147532 kB
Inact_dirty:     42988 kB
Inact_laundry:   13180 kB
Inact_clean:         0 kB
Inact_target:    50232 kB
HighTotal:     5373696 kB
HighFree:      5175996 kB
LowTotal:       784152 kB
LowFree:        663100 kB
SwapTotal:     4096532 kB
SwapFree:      4096532 kB
Committed_AS:  1208816 kB
HugePages_Total:     0
HugePages_Free:      0
Hugepagesize:     2048 kB

[xxx2:/proc] # vmstat 1 4
procs                      memory      swap          io     system
cpu
 r  b   swpd   free   buff  cache   si   so    bi    bo   in    cs us sy
wa id
 0  0      0 5838912  63704 140904    0    0    40    16   49    48  2
0  2 96
 0  0      0 5838912  63704 140904    0    0     0     0  193   164  0
0  0 100