hrProcessorLoad returns incorrect values for processor #'s > 100

Platform: IBM 3850 (10.1.20.10) w/ 16 CPUs, each with 8 cores = 128 CPUs
for monitoring

Net-snmp version: 5.3.2.2 (RHEL 5.6). Also built net-snmp-5.4.4 with
same results.

 

Values returned for hrProcessorLoad for CPU #'s greater than 100 appear
to be incorrect. They're always in the range of 90 > 100.

 

Using 'nmon' for linux, I get processor load values for those CPUs
consistent with the CPUs 1-100 (in the range of 1-5).

 

Snipetts from: snmpwalk -v 2c -c xxxxxx 10.1.20.10 .1.3.6.1.2.1.25

 

HOST-RESOURCES-MIB::hrDeviceDescr.768 = STRING: GenuineIntel: Intel(R)
Xeon(R) CPU      X7560  @ 2.27GHz

HOST-RESOURCES-MIB::hrDeviceDescr.769 = STRING: GenuineIntel: Intel(R)
Xeon(R) CPU      X7560  @ 2.27GHz

...

 

HOST-RESOURCES-MIB::hrDeviceDescr.894 = STRING: GenuineIntel: Intel(R)
Xeon(R) CPU      X7560  @ 2.27GHz

HOST-RESOURCES-MIB::hrDeviceDescr.895 = STRING: GenuineIntel: Intel(R)
Xeon(R) CPU      X7560  @ 2.27GHz

 

HOST-RESOURCES-MIB::hrProcessorLoad.768 = INTEGER: 3

HOST-RESOURCES-MIB::hrProcessorLoad.769 = INTEGER: 1

HOST-RESOURCES-MIB::hrProcessorLoad.770 = INTEGER: 2

HOST-RESOURCES-MIB::hrProcessorLoad.771 = INTEGER: 1

...

HOST-RESOURCES-MIB::hrProcessorLoad.865 = INTEGER: 1

HOST-RESOURCES-MIB::hrProcessorLoad.866 = INTEGER: 1

HOST-RESOURCES-MIB::hrProcessorLoad.867 = INTEGER: 1

HOST-RESOURCES-MIB::hrProcessorLoad.868 = INTEGER: 100

HOST-RESOURCES-MIB::hrProcessorLoad.869 = INTEGER: 100

HOST-RESOURCES-MIB::hrProcessorLoad.870 = INTEGER: 100

...

HOST-RESOURCES-MIB::hrProcessorLoad.892 = INTEGER: 100

HOST-RESOURCES-MIB::hrProcessorLoad.893 = INTEGER: 100

HOST-RESOURCES-MIB::hrProcessorLoad.894 = INTEGER: 100

HOST-RESOURCES-MIB::hrProcessorLoad.895 = INTEGER: 94

 

I'll admit this is a "one-of" case with this number of CPUs, but this
system is a production database server and I'd like to be able to
monitor its load with a reasonable degree of accuracy.

 

Any thoughts as to why this is happening? 

 

I'd be happy to try and solve this, if someone would suggest a few
source files that might have some bearing on this.

 

Thanks.

 

Joe

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