An insight into interpretation of the Load average graph and metrics on the Smoothwall.
Summary Report > Processor Section
The load average graph on the Reports > Reports > Summary page shows an abstract representation of the system workload (Processor section). It is not just a measure of CPU load but rather an abstract that tries to give a general insight into how well the system as a whole is coping with the workload.
System Resource Monitor
The System load average warning level of this monitor will send three numbers. Those numbers are the average sum of the number of processes waiting in the run-queue, plus the number currently executing, over 1, 5, and 15 minute time periods.
A more detailed explanation can be found here http://www.linuxjournal.com/article/9001
In short, if the load average is consistently significantly higher than the number of cores in the system, the system can be stressed for resources. If the load average is at the same number of cores or close, then the system is doing fine. For example; a dual core system with a load average of 0.5 does not have any processes waiting and is handling everything with no delays. A dual core system with a load average of 10 (8 higher than the number of cores) is being taxed the average should show if this is just a spike (in which case it's OK) or a continuous load.