[CentOS] snmp values for interface traffic - Centos 3.5/x86_64

Is there a problem with the values returned from snmp for ethx interface
traffic on x86_64?  I have cacti graphing several servers that should
peak around 200k/s and it sometimes pegs at 100M for periods of time
when in fact the interfaces are not busy at all.  I did a 'yum update'
and rebooted, and things cleared up for a while, but now at least one
is going crazy again, so perhaps the reboot just helped until something
triggered the condition again.  Stopping/starting snmpd doesn't help
and the values from ifconfig look sane.  I haven't seen anything like
it on x86 servers doing otherwise similar things, just the x86_64's.

-- 
  Les Mikesell
   lesmikesell at gmail.com