Some quick ways to find out how much of or VM’s time is spent waiting for ESXi to schedule CPU time:
As a shortcut, you can use the following formulas for the default chart update intervals to get the CPU ready %:
Realtime: CPU summation value / 200
Past Day: CPU summation value / 3000
Past Week: CPU summation value / 18000
Past Month: CPU summation value / 72000
Past Year: CPU summation value / 864000
Example: A realtime CPU summation value of 1000 is divided by 200 to give a CPU ready % of 5.
CPU ready summation value
As with the longer version of the formula, reverse the formula and multiply (rather tha dividing) to calculate the CPU ready summation value:
Realtime: CPU ready % * 200
Past Day: CPU ready % * 3000
Past Week: CPU ready % * 18000
Past Month: CPU ready % * 72000
Past Year: CPU ready % * 864000
Example: If you have a CPU ready % 5, multiply it by 200 to get a Realtime CPU ready summation value of 1000.
Above taken from here:
A good blog post on the topic of Ready Time:
