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    SubjectRe: [PATCH 0/6][RFC] virtio-blk: Change I/O path from request to BIO
    On Wed, Dec 21, 2011 at 10:00:48AM +0900, Minchan Kim wrote:
    > This patch is follow-up of Christohp Hellwig's work
    > [RFC: ->make_request support for virtio-blk].
    > Quote from hch
    > "This patchset allows the virtio-blk driver to support much higher IOP
    > rates which can be driven out of modern PCI-e flash devices. At this
    > point it really is just a RFC due to various issues."
    > I fixed race bug and add batch I/O for enhancing sequential I/O,
    > FLUSH/FUA emulation.
    > I tested this patch on fusion I/O device by aio-stress.
    > Result is following as.
    > Benchmark : aio-stress (64 thread, test file size 512M, 8K io per IO, O_DIRECT write)
    > Environment: 8 socket - 8 core, 2533.372Hz, Fusion IO 320G storage
    > Test repeated by 20 times
    > Guest I/O scheduler : CFQ
    > Host I/O scheduler : NOOP

    May be using deadline or noop in guest is better to benchmark against
    PCI-E based flash.


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