bsnmpd returns incorrect hrProcessorLoad values

[Mikolaj Golub]

On Fri, 29 Jan 2010 12:37:52 +0100 Gustau Pérez wrote:

>   Hi,
>
>   I'm using cacti to monitor some servers running FBSD. I was using 7.2
> with SCHED_4BSD. With this configuration : bsnmpd+bsnmp-ucd was
> returning right values for the cores' load.
>
>    I recently updated the servers (via csup) to RELENG_8 and bsnmpd is
> returning negative values for the cores' load. If I try something like
> in a 4-core system :
>
>               snmpwalk -v 2c -c community server .1.3.6.1.2.1.25.3.3.1
>
>    what I get is :
>
>         .1.3.6.1.2.1.25.3.3.1.1.6 = OID: .0.0
>         .1.3.6.1.2.1.25.3.3.1.1.10 = OID: .0.0
>         .1.3.6.1.2.1.25.3.3.1.1.14 = OID: .0.0
>         .1.3.6.1.2.1.25.3.3.1.1.18 = OID: .0.0
>         .1.3.6.1.2.1.25.3.3.1.2.6 = INTEGER: -182
>         .1.3.6.1.2.1.25.3.3.1.2.10 = INTEGER: -182
>         .1.3.6.1.2.1.25.3.3.1.2.14 = INTEGER: -182
>         .1.3.6.1.2.1.25.3.3.1.2.18 = INTEGER: -182
>
>   I tried and old bsnmpd-ucd (0.2.1, works fine in a 7,2 system) with a
> 8.0 system. Same wrong results. And it seems bsnmpd in /usr/src/contrib
> has not changed between 7.2 and 8.0.
>
>   Any ideas ? I'm not an expert, but with tcpdump I see different
> results. Against an old 7.2 system, the field related to each core load
> gives the right value. Instead, against and 8.0 system, those field show
> (in hex) values like fd 4b. What I don't know is how bsdnmp-ucb retrives
> those values and how it construct the udp response packet.

bsnmpd-ucd has nothing to do with HOST-RESOURCES-MIB. These mibs are provided
by snmp_hostres(3) module (/usr/lib/snmp_hostres.so). So something wrong is
there (I suppose it is not in sync with some recent changes in kernel or
libkvm).

-- 
Mikolaj Golub