Target CPU Utilization – Extract from Oracle WebLogic Server Performance and Tuning

§ Determining your target CPU utilization.

Your target CPU usage should not be 100%, you should determine a target CPU utilization based on your application needs, including CPU cycles for peak usage. If your CPU utilization is optimized at 100% during normal load hours, you have no capacity to handle a peak load. In applications that are latency sensitive and maintaining the ability for a fast response time is important, high CPU usage (approaching 100% utilization) can reduce response times while throughput stays constant or even increases because of work queuing up in the server. For such applications, a 70% – 80% CPU utilization recommended. A good target for non-latency sensitive applications is about 90%.

http://docs.oracle.com/cd/E13222_01/wls/docs92/perform/basics.html

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