problem with memeory per httpd process

Hi all 

I have almost 2 identical apache sever(same version and also configuration
files are the sames) running on almost identical Centos OS.
If I look to the top command I can see these diferencies:

server 1:
-----------
Tasks:  79 total,   1 running,  78 sleeping,   0 stopped,   0 zombie
Cpu(s):  1.0%us,  3.0%sy,  0.0%ni, 96.0%id,  0.0%wa,  0.0%hi,  0.0%si, 
0.0%st
Mem:   1035244k total,   985732k used,    49512k free,   168884k buffers
Swap:  2031608k total,       56k used,  2031552k free,   572548k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 1812 apache    15   0 62812  13m 7516 S  1.0  1.3   1:06.92 httpd
18545 apache    16   0 63156  13m 7376 S  0.7  1.3   0:12.74 httpd
21154 apache    16   0 62812  13m 7224 S  0.7  1.3   0:04.76 httpd
30377 apache    23   0 62812  13m 7520 S  0.7  1.3   1:18.93 httpd



server 2:
----------
Tasks:  88 total,   2 running,  86 sleeping,   0 stopped,   0 zombie
Cpu(s):  1.0%us,  2.0%sy,  0.0%ni, 96.7%id,  0.0%wa,  0.3%hi,  0.0%si, 
0.0%st
Mem:   1035244k total,  1000408k used,    34836k free,   157928k buffers
Swap:  2031608k total,       56k used,  2031552k free,   557524k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 9180 apache    16   0 64372  25m  18m S  0.7  2.6   0:55.54 httpd
18408 apache    16   0 63092  25m  18m S  0.7  2.5   0:34.01 httpd
24512 apache    18   0 63180  24m  17m S  0.7  2.4   0:17.48 httpd
25253 apache    15   0 65992  27m  18m S  0.7  2.7   0:16.59 httpd



On server 1 each httpd server consumption just 13M of memory, but on on
server 2 it is 25M of memory.
Can anyone help me to understand what can cause these diferencies?

thank you
/c
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