"KVM has been part of Red Hat Enterprise Linux since the release
of version 5.4 back in September. At the time, the new KVM
virtualization base was big news. It's still an important part of
the OS. So much so that now Red Hat is further expanding with RHEL
5.5, which it released to beta on Wednesday. The key enhancement is
a new run-time memory allocation feature for KVM virtual guests
that allows them guests to obtain extra memory as required, and
thus not "be stuck with a fixed amount of memory, as Internetnews
"This will mitigate many of the I/O issues frequently associated
with virtualization. For an organization for which I/O is a
significant pain point, having it resolved natively may prove to be
a sufficient advantage.
"The other virtualization improvement Internetnews notes is PCI
passthrough, which "enables a virtual operating system to see and
utilize a computer's PCI devices as though they were physically
attached. With RHEL 5.5, Red Hat has improved support for PCI
passthrough on both AMD and Intel chipsets."
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