RHEL 4 - Memory Problem

[qua nong]

Hi list,

We have a AMD with RHEL4 64 installed and the Oracle 10g installed as well.
It has  the latest kernel update 2.6.9-42.0.8.ELsmp but the memory is always being used by some unexplained processes.

There are 4 CPUs, 16 GB RAM, 33GB swap but memory used = 16148872k

Even when oracle is shutdown, a memory use  is  still nearly 16GB. CPU is 99.4 % in idle, and I/O is too quiet. This is quite difficult to explain.

Could anyone have any idea ?

Here is the display of the top command

top - 14:57:33 up 30 days, 22:29,  3 users,  load average: 0.22, 0.10, 0.02
Tasks: 121 total,   1 running, 120 sleeping,   0 stopped,   0 zombie
Cpu(s):  0.0% us,  0.0% sy,  0.0% ni, 99.4% id,  0.6% wa,  0.0% hi,  0.0% si
Mem:  16360260k total, 16198280k used,   161980k free,   256496k buffers
Swap: 33551744k total,   186960k used, 33364784k free, 14973940k cached

 vmstat 2
procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
 r  b   swpd   free   buff  cache   si   so    bi    bo   in    cs us sy id wa
 0  0 186960 161420 256496 14973940    0    0     1   112    3     1  0  0 99  1
 0  0 186960 162284 256496 14973940    0    0     0   170 1021  2162  0  0 100  0
 0  0 186960 162276 256496 14973940    0    0     0    44 1009  2149  0  0 100  0
 0  0 186960 162284 256496 14973940    0    0     0    42 1008  2244  0  0 99  0
 0  0 186960 162292 256496 14973940    0    0     0    48 1011  2164  0  0 99  0
 0  0 186960 162292 256496 14973940    0    0     0    56 1006  2118  0  0 100  0
 0  0 186960 162292 256496 14973940    0    0     0    66 1011  2154  0  0 98  2



cat /proc/meminfo
MemTotal:     16360260 kB
MemFree:        162740 kB
Buffers:        256496 kB
Cached:       14973940 kB
SwapCached:       9724 kB
Active:        2709340 kB
Inactive:     12799980 kB
HighTotal:           0 kB
HighFree:            0 kB
LowTotal:     16360260 kB
LowFree:        162740 kB
SwapTotal:    33551744 kB
SwapFree:     33364784 kB
Dirty:             332 kB
Writeback:         140 kB
Mapped:        1147256 kB
Slab:           608056 kB
CommitLimit:  41731872 kB
Committed_AS:  7853044 kB
PageTables:      39080 kB
VmallocTotal: 536870911 kB
VmallocUsed:     16760 kB
VmallocChunk: 536854071 kB
HugePages_Total:     0
HugePages_Free:      0
Hugepagesize:     2048 kB








 
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