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    SubjectRe: [GIT PULL] AlacrityVM guest drivers for 2.6.33
    On 12/23/09 3:36 PM, Avi Kivity wrote:
    > On 12/23/2009 06:44 PM, Gregory Haskins wrote:
    >>
    >>> - Are a pure software concept
    >>>
    >> By design. In fact, I would describe it as "software to software
    >> optimized" as opposed to trying to shoehorn into something that was
    >> designed as a software-to-hardware interface (and therefore has
    >> assumptions about the constraints in that environment that are not
    >> applicable in software-only).
    >>
    >>
    >
    > And that's the biggest mistake you can make.

    Sorry, that is just wrong or you wouldn't have virtio either.

    > Look at Xen, for
    > instance. The paravirtualized the fork out of everything that moved in
    > order to get x86 virt going. And where are they now? x86_64 syscalls
    > are slow since they have to trap to the hypervisor and (partially) flush
    > the tlb. With npt or ept capable hosts performance is better for many
    > workloads on fullvirt. And paravirt doesn't support Windows. Their
    > unsung hero Jeremy is still trying to upstream dom0 Xen support. And
    > they get to support it forever.

    We are only talking about PV-IO here, so not apples to apples to what
    Xen is going through.

    >
    > VMware stuck with the hardware defined interfaces. Sure they had to
    > implement binary translation to get there, but as a result, they only
    > have to support one interface, all guests support it, and they can drop
    > it on newer hosts where it doesn't give them anything.

    Again, you are confusing PV-IO. Not relevant here. Afaict, vmware,
    kvm, xen, etc, all still do PV-IO and likely will for the foreseeable
    future.

    -Greg

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