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    SubjectRe: [PATCH 7/8] lguest: trivial guest block driver
    On Mon, 2007-02-12 at 16:01 +0100, Jens Axboe wrote:
    > On Mon, Feb 12 2007, Rusty Russell wrote:
    > > Thanks Jens!!
    > My pleasure, it's not often you get to make that big a performance
    > improvement with just a little few lines of change :-)

    *cough* I deliberately leave these low hanging fruit in lguest to
    encourage people to hack on it. Really. *cough*

    > I guess you'll take changes to make this driver queuing as well? It's
    > pretty important for good guest io performance as well.

    The question is whether the guest or host should queue. If you have
    multiple guests sharing a disk in the hose, I would think that the host
    is better off queuing. And this would seem to be the common case.

    On my todo list is:
    1) Implement write barriers, (-> fsync in the host)
    2) Make the host userspace program (lguest) async rather than blocking,
    3) Allow multiple outstanding requests.

    Then it should be useful for other hypervisors.


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