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Re: [Xen-devel] Native hypercall basics using int 82

On 17/12/2008 11:46, "Andrew Lyon" <andrew.lyon@xxxxxxxxx> wrote:

> How is it enabled in the open source edition? I cannot find any documentation.

Add 'viridian=1' to your domain config file.

> And how does it improve performance?

APIC accesses are done via emulated MSRs rather than emulated mmio cycles,
which is a teeny bit faster. Also we implement spin-wait notofications, so a
vcpu can be descheduled rather than spin. There's others also we could
implement but it's not clear it would be a win for us.

 -- Keir

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