Hi:
   I use libvirt manage virtual guest, When I start many virtual domain(my host 
128G physical memory), example, I start 100 guest, 1G per guest。sometime I will 
encounter "cannot allocate memory", "cannot set up guest memory \'pc.ram\': 
cannot allocate memory". sometime encounter qemu process killed by system(oom),
  I want to know what minimal memory need when start a domain ? and how many 
host free memory reserve can ensure vm running steady.
 Thanks

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