> I have attempted to measure CPU overhead due to
> inter-zone networking using 
> various tools, including DTrace and an internal
> network benchmark tool.  Any 
> overhead was so small that it could not be measured,
> and was always less than 
> 1%.  

Could be present a "very high" network latency compared to the single zone 
Anyway I can assure that switching from 2 zone to a single zone decrease system 
cpu% by 18-20%.
No paging. No resource control.

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