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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