On 03/20/10 16:19, Bruce Simpson wrote:
There is a performance penalty, because Xen has to emulate real
hardware for HVM, using code largely cribbed from QEMU.
Normally this happens within the hypervisor itself, however, this is
problematic, because there is then no good way to book the
CPU/memory/IO involved to the domU doing the I/O. This in turn affects
scheduling parameters.
Correction: mostly dom0 with some hypervisor bits on top.
But this still screws up HVM domU accounting.
In a hosting environment, this is all important. Chisnall's Xen book
explains this in great detail.
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