CPU usage SNMP vs GKrellM
 

I'm using mrtg to monitor my centos and redhat systems and my graphs just didnt seem to indicate what I was expecting in regard to user and sys cpu so I installed GKrellM and it reports differently than what mrtg reports and its actually what I was expecting it to be. I tried installing routers2 and using there mrtg generated files but it gives me the same snmp strings

for instance now the cpu for user and sys is sitting at 56% and 46% respectively but mrtg is reporting 6 and 3 respectively and 89% idle how is this possible?

UCD-SNMP-MIB::ssCpuUser.0 = INTEGER: 6
UCD-SNMP-MIB::ssCpuSystem.0 = INTEGER: 3
UCD-SNMP-MIB::ssCpuIdle.0 = INTEGER: 89