Getting processor load?

Hi,

I'm running net-snmp version 5.3 and my intention is to use the output of the snmp daemon for NAGIOS.
Right now I'm monitoring a number of linux and windows boxes via snmp but there is one detail for which I haven't found a solution, yet.

I have checked the MIB files for a way to get information about the processor load and found the ssCpu objects.
According to UCD-SNMP-MIB.txt ssCpuUser, ssCpuSystem and ssCpuIdle are deprecated. 
These three object return differents values on every PC, but these values never change.

UCD-SNMP-MIB.txt recommends to use the ssCpuRaw object, but these are Counter32 values, and I expect to get a percentage. Am I on the wrong track and these are the wrong objects for my purpose or can anyone show me an easy way to just get the processor load (percentage)?

Thanks for any help,

Stefan

Here is the current output of one of the PCs

snmpwalk -c public -v 2c 127.0.0.1 ucd | grep -i cpu
UCD-SNMP-MIB::ssCpuUser.0 = INTEGER: 0
UCD-SNMP-MIB::ssCpuSystem.0 = INTEGER: 0
UCD-SNMP-MIB::ssCpuIdle.0 = INTEGER: 99
UCD-SNMP-MIB::ssCpuRawUser.0 = Counter32: 48421
UCD-SNMP-MIB::ssCpuRawNice.0 = Counter32: 17647
UCD-SNMP-MIB::ssCpuRawSystem.0 = Counter32: 7590
UCD-SNMP-MIB::ssCpuRawIdle.0 = Counter32: 889352
UCD-SNMP-MIB::ssCpuRawWait.0 = Counter32: 4454
UCD-SNMP-MIB::ssCpuRawKernel.0 = Counter32: 7370
UCD-SNMP-MIB::ssCpuRawInterrupt.0 = Counter32: 77
UCD-SNMP-MIB::ssCpuRawSoftIRQ.0 = Counter32: 143

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