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    SubjectRe: [PATCH RESEND 5/5] vhost-blk: Add vhost-blk support
    "Michael S. Tsirkin" <> writes:

    > On Thu, Jul 19, 2012 at 08:05:42AM -0500, Anthony Liguori wrote:
    >> Of course, the million dollar question is why would using AIO in the
    >> kernel be faster than using AIO in userspace?
    > Actually for me a more important question is how does it compare
    > with virtio-blk dataplane?

    I'm not even asking for a benchmark comparision. It's the same API
    being called from a kernel thread vs. a userspace thread. Why would
    there be a 60% performance difference between the two? That doesn't
    make any sense.

    There's got to be a better justification for putting this in the kernel
    than just that we can.

    I completely understand why Christoph's suggestion of submitting BIOs
    directly would be faster. There's no way to do that in userspace.


    Anthony Liguori

    > --
    > MST

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