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Virtualization, together with real

time support
emerges to
be used in an
increasing amount of use cases,
varying
from embedded system
s
to enterprise computing
. One of the most popular
open

source
virtualization
softw
are’s
is
Xen
.
Its current implementation does not qualify it to be
a candidate for
time

critical systems. Researchers
and developers extend
ed
it
and claim
the
efficient usage
of their versions
in
such systems.
RT

Xen is one of these versions. It is a vir
tualization platform based on Compositional Scheduling and uses
a suite of fixed

priority schedulers.
This paper evaluates the performance and scheduling
behaviour
of RT

Xen.
The test results show that only
two
proposed
schedulers
are
suitable
to be used
for
soft
real

time applications.
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