Windows Server® 2012 Unleashed
by Rand Morimoto, Michael Noel, Guy Yardeni, Omar Droubi, Andrew Abbate, Chris Amaris
Analyzing Processor Usage
Most often, the processor resource is the first one analyzed when system performance decreases noticeably. For capacity-analysis purposes, you should monitor two counters: % Processor Time and Interrupts/sec.
The % Processor Time counter indicates the percentage of overall processor utilization. If the system has more than one processor, an instance for each one is included along with a total (combined) value counter. If this counter averages a usage rate of 50% or greater for long durations, you should first consult other system counters to identify any processes that might be improperly using the processors or consider upgrading the processor or processors. Generally speaking, consistent utilization in the 50% range ...
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