Monitoring Cpu with SNMP

Hello,
I'am trying to monitor the CPU usage with snmp.
I found ssCpuRawIdle.0 but each time I do :
# snmpget -v 2c -c public localhost ssCpuRawIdle.0
UCD-SNMP-MIB::ssCpuRawIdle.0 = Counter32: 0
The answer is always 0.
I think is wrong, there must be value, but I cannot interdstand what.
snmpd is running and I can obtain answer with other request.
Thanks in advance fr your help.
Jacques

I will add this to my queue of SNMP bugs.
Incorrect data like this are because OS X looks like FreeBSD to the Net-SNMP project, but OS X has some new APIs/SPIs/KPIs that deprecate or eliminate those used by FreeBSD in an attempt to be a more secure consumer-oriented OS.
Macs. Lotsa macs. All without SNMP.    

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    http://blogs.sun.com/jmxetc/entry/jmx_vs_snmp
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    -- daniel
    JMX, SNMP, Java, etc...
    http://blogs.sun.com/jmxetc

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