05-18-2019
You have 8 core with hyperthreading ON.
Operating systems will interpret those as 16 cores (2 threads per core).
Maximum value for ncpu property on your system is = 16 (1600%)
One can set for a zone an arbitrary decimal number, say 1.37, which will get you 137% out of 1600% cpu time.
Not specific cores, but cpu time governed by the FSS scheduler.
This could be the reason why utilities are reporting 'strange' results inside non-global zone using ncpu property.
Also, applications which use utilities to optimize their work (count the cores/threads to optimize them self), may exhibit performance impact when using ncpu.
On the other hand, dedicated-cpu property sets fix number of cores for that zone (out of 16).
Utilities inside non-global zone will report this correctly and applications relaying on those will get correct number to work with.
Mixing those properties is ill-advised and incompatible.
So in your case, set a 1 dedicated-cpu resourse to global zone and other 15 on non-global zones as you see fit to achieve complete isolation.
There is an option to use psets as well, which group the core(s) in specific group, which you can then assign to zones.
For instance, making a 8 core pset named dbpset, assigning it to 2 zones - both zones will show 8 cores inside.
Hope that helps
Regards
Peasant
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