Recommended CPU % utilized

What indicators can be used to justify or shoot down a proposal to upgrade
CPU? Are there any published recommendations anywhere? Digging through the
work management guide didn't turn up anything. About all I could come up
with is a bar chart that shows the percent of time that CPU utilization was
above x%. Subjectively, I know that when it goes over 90%, interactive
response starts to deteriorate, and since we have tuned batch to favor
interactive response time, I suspect that batch starts to deteriorate as
soon as utilization gets over 50-60%, with major throughput degradation by
the time it reaches 80%. I have not done any benchmarks on this yet. That's
my probable next step. 

Pete Hall
pbhall@execpc.com
http://www.execpc.com/~pbhall
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