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Hello.

Did someone have experience with many-many instances on a single host? 
What kind of issues you find on '200 instances' (300) borderline? Any 
specific performance issues, stability? (KVM)

I've just start playing with that idea and I see that 150 instances 
consume significant amount of CPU for nothing (300%, with 4% per qemu 
process), and libvirtd eats for 30% in the peak, plus about 11% for 
nova-compute. But this is in the lab conditions.

Any real-life experience?

Thanks!