AFAIK, the load average takes into account the number of CPU's you have - so a good value is not dependant on CPU count.
Ideally it want's to be below 1 - anything over that is a busy server.
Anything between 1 and 2 is busy, anything between 2 & 3 is very busy, anything over 3 or more means you should be looking at ways to reduce it. Anything over about 5 is an overloaded server and means response will suffer. Anything over 10 is bad - it means trouble.
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