For a heavily I/O-bound load such as media streaming, it's better not to
use virtualization. There are some newer technologies such as SR-IOV
which may mitigate these problems, but I don't particularly suggest
straying that close to the bleeding edge on a presumably
mission-critical system.
If you really want to be able to compartmentalize tasks running on this
hardware, look at BSD jails, OpenVZ or Virtuozzo for an alternate
non-virtualization approach which doesn't have as much overhead on
I/O-heavy loads.
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