linux hogging memory

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All,

We have a FC1 system running kernel 2.4.22-1.2115.nptl and kde3
configured as a backup server. The machine has 384MB ram. 

We have been observing the total memory usage of the system. If we let
it run without reboot for days then we see the memory usage (as shown by
top) keeps increasing steadily. At the end of the week, it barely has
8MB of "free" memory, rest all is used up. But "top" does not show who
is using the rest of 376MB. The total of top 20 program's memory usage
does not come anywhere close to 376MB. 
If we reboot the machine then memory usage drops to "acceptable" values
of around 150MB.
Below is the output of chkconfig listing. The machine runs at level 5. 

Any insight from experts would be appreciated. 

Thanks,
Jay

[[email protected] root]# chkconfig --list
gpm             0:off   1:off   2:on    3:on    4:on    5:on    6:off
kudzu           0:off   1:off   2:off   3:on    4:on    5:on    6:off
syslog          0:off   1:off   2:on    3:on    4:on    5:on    6:off
rawdevices      0:off   1:off   2:off   3:on    4:on    5:on    6:off
netfs           0:off   1:off   2:off   3:on    4:on    5:on    6:off
network         0:off   1:off   2:on    3:on    4:on    5:on    6:off
random          0:off   1:off   2:on    3:on    4:on    5:on    6:off
saslauthd       0:off   1:off   2:off   3:off   4:off   5:off   6:off
anacron         0:off   1:off   2:on    3:on    4:on    5:on    6:off
irqbalance      0:off   1:off   2:off   3:on    4:on    5:on    6:off
microcode_ctl   0:off   1:off   2:on    3:on    4:on    5:on    6:off
smartd          0:off   1:off   2:on    3:on    4:on    5:on    6:off
sshd            0:off   1:off   2:on    3:on    4:on    5:on    6:off
portmap         0:off   1:off   2:off   3:on    4:on    5:on    6:off
rhnsd           0:off   1:off   2:off   3:on    4:on    5:on    6:off
crond           0:off   1:off   2:on    3:on    4:on    5:on    6:off
yum             0:off   1:off   2:off   3:off   4:off   5:off   6:off
messagebus      0:off   1:off   2:off   3:on    4:on    5:on    6:off
xfs             0:off   1:off   2:on    3:on    4:on    5:on    6:off
xinetd          0:off   1:off   2:off   3:on    4:on    5:on    6:off
ntpd            0:off   1:off   2:off   3:off   4:off   5:off   6:off
vncserver       0:off   1:off   2:off   3:off   4:off   5:off   6:off
vsftpd          0:off   1:off   2:off   3:on    4:off   5:on    6:off
yppasswdd       0:off   1:off   2:off   3:off   4:off   5:off   6:off
ypserv          0:off   1:off   2:off   3:off   4:off   5:off   6:off
ypxfrd          0:off   1:off   2:off   3:off   4:off   5:off   6:off
xinetd based services:
        chargen-udp:    off
        rsync:  off
        chargen:        off
        daytime-udp:    off
        daytime:        off
        echo-udp:       off
        echo:   off
        services:       off
        time:   off
        time-udp:       off
        cups-lpd:       off
        sgi_fam:        on
        ktalk:  off
        finger: off
        telnet: on
        tftp:   off

 



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