Re: [Mactel-linux-devel] Xen on Mactel

[Thomas G. <sit...@st...>]

Hallo,

> Looks like everything points to the fact that the MBP's are VT
> enabled.  But is it true that a VT enabled Xen running unmodified
> guest OS (Linux) is *slow* compared to the same running a Xen aware
> Linux kernel?

I attended a talk at Fosdem where Ian Kent stated that a Operating
System which is ported to XEN is always faster than one where shadow
registers (VT / Pacifica) is used. But he didn't showed any numbers. The
reason for that is that there are specialized instructions (hypercalls)
in xen which make it possible to do several logical operations in one
hypercall. And hypercalls are expensive.

        Thomas