hrProcessorLoad SNMP value unreliable

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Author

Subject: hrProcessorLoad SNMP value unreliable

GXW

Sep 23, 2009 13:03:45 GMT

I have installed net-SNMP 5.4.2.1 from HP Internet Express and configured it to do some monitoring.

However, I can't get any reasonable stats out of hrProcessorLoad. I have a 4-way Itanium box and deliberatley set the cpu util at 50% by hogging two CPUs, and sar returns 50% and top returns 100%,100%,0%,0%.

However, hrProcessorLoad returns strange values anywhere between 2 and 35.
Also, in other implementations I've seen multiple hrProcessorLoad values returned to reflect multiple CPUs but I only get the one (768, whereas I would expect to see hrProcessorLoad values for 769,770 and 771 too!)

Can anyone suggest how I get some sensible CPU values out of net-SNMP?

I have included a sample output below:

# /opt/iexpress/net-snmp/bin/snmpwalk -v 1 -c <my-comm-string> <my-ip> | grep -i proc
SNMPv2-MIB::sysORDescr.2 = STRING: The MIB for Message Processing and Dispatching.
HOST-RESOURCES-MIB::hrSystemProcesses.0 = Gauge32: 141
HOST-RESOURCES-MIB::hrSystemMaxProcesses.0 = INTEGER: 4200
HOST-RESOURCES-MIB::hrDeviceType.768 = OID: HOST-RESOURCES-TYPES::hrDeviceProcessor
HOST-RESOURCES-MIB::hrDeviceType.769 = OID: HOST-RESOURCES-TYPES::hrDeviceProcessor
HOST-RESOURCES-MIB::hrDeviceType.770 = OID: HOST-RESOURCES-TYPES::hrDeviceProcessor
HOST-RESOURCES-MIB::hrDeviceType.771 = OID: HOST-RESOURCES-TYPES::hrDeviceProcessor
HOST-RESOURCES-MIB::hrDeviceType.3072 = OID: HOST-RESOURCES-TYPES::hrDeviceCoprocessor
HOST-RESOURCES-MIB::hrDeviceDescr.3072 = STRING: Guessing that there's a floating point co-processor
HOST-RESOURCES-MIB::hrProcessorFrwID.768 = OID: SNMPv2-SMI::zeroDotZero
HOST-RESOURCES-MIB::hrProcessorFrwID.769 = OID: SNMPv2-SMI::zeroDotZero
HOST-RESOURCES-MIB::hrProcessorFrwID.770 = OID: SNMPv2-SMI::zeroDotZero
HOST-RESOURCES-MIB::hrProcessorFrwID.771 = OID: SNMPv2-SMI::zeroDotZero
HOST-RESOURCES-MIB::hrProcessorLoad.768 = INTEGER: 31
HOST-RESOURCES-MIB::hrSWRunParameters.1741 = STRING: "stats buffer process "
HOST-RESOURCES-MIB::hrSWRunParameters.1742 = STRING: "stats collector process "
HOST-RESOURCES-MIB::hrSWRunParameters.6375 = STRING: "-i proc"
#

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