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    SubjectRe: [PATCH V4 3/3] virtio-blk: Add bio-based IO path for virtio-blk
    On Mon, Jul 30, 2012 at 11:25:51AM +0930, Rusty Russell wrote:
    > I consider this approach a half-way step. Quick attempts on my laptop
    > and I couldn't find a case where the bio path was a loss, but in theory
    > if the host wasn't doing any reordering and it was a slow device, you'd
    > want the guest to do so.
    >
    > I'm not sure if current qemu can be configured to do such a thing?


    The host kernel will do the I/O scheduling for you unless you explicitly
    disable it. And we should be able to assume an administrator will only
    disable it when they have a reason for it - if not they'll get worse
    performance for non-virtualized workloads as well.



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