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    SubjectRe: [PATCH RFC] virtio: put last seen used index into ring itself
    On Thu, 6 May 2010 06:28:14 am Michael S. Tsirkin wrote:
    > Rusty,
    > this is a simplified form of a patch you posted in the past.
    > I have a vhost patch that, using this feature, shows external
    > to host bandwidth grow from 5 to 7 GB/s, by avoiding
    > an interrupt in the window after previous interrupt
    > was sent and before interrupts were disabled for the vq.
    > With vhost under some external to host loads I see
    > this window being hit about 30% sometimes.

    Fascinating. So you use this to guess if the guest is still processing?
    I haven't thought about it hard, but is that racy?

    Obviously happy to apply this when you finalize it.


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