Why is load average being reported as 0.00 though system is busy doing work?

uptime, top, cat /proc/loadavg all reporting load averages for the last 1/5/15 minutes as 0.00, but the system is definitely busy doing work. Why is this? Server is running Red Hat Enterprise Linux Server release 6.6, kernel 2.6.32-504.12.2.el6.x86_64. $ uptime 12:13:44 up 73 days, 8 min, 1 user, load average: 0.00, 0.00, 0.00 $ cat /proc/loadavg 0.00 0.00 0.00 12/2706 39700 $ top top - 12:15:35 up 73 days, 10 min, 1 user, load average: 0.00, 0.00, 0.00 Tasks: 572 total, 4 running, 568 sleeping, 0 stopped, 0 zombie Cpu(s): 37.1%us, 2.3%sy, 0.0%ni, 42.0%id, 18.0%wa, 0.0%hi, 0.5%si, 0.0%st ...