Greetings,
WOW!!!!, thanks for all the reply!!, this is a nice community, i get all the advice by just reading around thank you everyone!,
at first, i have installed ubuntu already in 4 VM running KVM. I really like UNIX, since i am a mac user ever since and freeBSD was my first OS when i was a kid..
I've read around and as far as I've learned, installing BSD around KVM has bad performance like I/O and installing it takes time and effort(if i wanted to) which i don't have.
i wanted to install BSD/UNIX since i wanted to get barely close to metal and i know UNIX has a nice security performance than linux, and Unix has nice performance in memory management too.
at first i really wanted to install VM in NetBSD/ FreeBSD. but installing it really takes time. i work 14hrs a day as a web app engineer, and i have dont have much time configuring out a server.
anway, im fine with ubuntu server now running on a ivy bridge i5 and 32gb memory. i guess this is all i need right now. its serving a Redis as a primary data store to my apps, and apps at my job.
redis is so fun to use :)
thanks again for the suggestions, more power!!