Inactive memory Grows unlimited

Hi,

I hope you can help me...there's something wrong going on my db server (OS.
GNU/linux White box)... here's the problem...

The amount of Inactive memory Grows unlimited .... this happens only when
Postgresql (8.1.1) is running... after a few days it "eats" all the RAM
memory ... so I've have to restart the server to free RAM....

Here's the parametres actually active in then postgresql.conf file

max_connections = 100
authentication_timeout = 60
password_encryption = on
shared_buffers = 1000
work_mem = 131076
maintenance_work_mem = 262152
redirect_stderr = on
log_directory = 'pg_log'
log_truncate_on_rotation = on
log_rotation_age = 1440
log_rotation_size = 0
lc_messages = 'es_ES.UTF-8'
lc_monetary = 'es_ES.UTF-8'
lc_numeric = 'es_ES.UTF-8'
lc_time = 'es_ES.UTF-8'

Below you can find the content of meminfo file with 18 users connected
(average during working days) and the server has benn running during 2 days
2:19

#cat /proc/meminfo
MemTotal:      2074844 kB
MemFree:       1371660 kB
Buffers:         61748 kB
Cached:         555492 kB
SwapCached:          0 kB
Active:         348604 kB
Inactive:       305876 kB
HighTotal:     1179440 kB
HighFree:       579904 kB
LowTotal:       895404 kB
LowFree:        791756 kB
SwapTotal:     2048248 kB
SwapFree:      2048248 kB
Dirty:             260 kB
Writeback:           0 kB
Mapped:          54824 kB
Slab:            35756 kB
Committed_AS:   117624 kB
PageTables:       3404 kB
VmallocTotal:   106488 kB
VmallocUsed:      3356 kB
VmallocChunk:   102920 kB
HugePages_Total:     0
HugePages_Free:      0
Hugepagesize:     2048 kB

thanks in advance for your help,

Alvaro Arcila

pd: sorry for my english It's not very good, I hope I'm clear....