proc.mem not supported

[Bono]

Hi i'm trying to run following command on RHEL4:


zabbix_agentd -t proc.mem[mysql,mysqld]
proc.mem[mysql,mysqld] [m|ZBX_NOTSUPPORTED]

zabbix_agentd -t vfs.dev.read[sda,,avg15]
vfs.dev.read[sda,,avg15] [m|ZBX_NOTSUPPORTED]

Any is there way to monitor network load also? Not how much data has been transfered but actual load like cpu usage.

Anybody can tell me what I need to enable?
Btw Zabbix is one of the best program i used for monitoring!

Thanks in advance for help.