Actually, the second number is the sum of the number of seconds that all cores on the machine have spent idle, so that number may be higher than the first one. Source: https://access.redhat.com/documentation/en-US/Red_Hat_Enterp...
My source (first result in Google) was this link https://www.centos.org/docs/5/html/5.1/Deployment_Guide/s2-p... which looks like an older version of the documentation that does not have that last sentence.
Actually, the second number is the sum of the number of seconds that all cores on the machine have spent idle, so that number may be higher than the first one. Source: https://access.redhat.com/documentation/en-US/Red_Hat_Enterp...