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    Subject[PATCH 0/6][RFC] virtio-blk: Change I/O path from request to BIO
    Date
    This patch is follow-up of Christohp Hellwig's work
    [RFC: ->make_request support for virtio-blk].
    http://thread.gmane.org/gmane.linux.kernel/1199763

    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

    Request BIO(patch 1-4) BIO-batch(patch 1-6)
    (MB/s) stddev (MB/s) stddev (MB/s) stddev
    w 737.820 4.063 613.735 31.605 730.288 24.854
    rw 208.754 20.450 314.630 37.352 317.831 41.719
    r 770.974 2.340 347.483 51.370 750.324 8.280
    rr 250.391 16.910 350.053 29.986 325.976 24.846

    This patch enhances ramdom I/O performance compared to request-based I/O path.
    It's still RFC so welcome to any comment and review.

    Christoph Hellwig (3):
    block: add bio_map_sg
    virtio: support unlocked queue kick
    virtio-blk: remove the unused list of pending requests

    Minchan Kim (3):
    virtio-blk: implement ->make_request
    virtio-blk: Support batch I/O for enhancing sequential IO
    virtio-blk: Emulate Flush/FUA

    block/blk-merge.c | 63 ++++
    drivers/block/virtio_blk.c | 690 ++++++++++++++++++++++++++++++++++++++----
    drivers/virtio/virtio_ring.c | 33 ++-
    include/linux/blkdev.h | 2 +
    include/linux/virtio.h | 21 ++
    5 files changed, 737 insertions(+), 72 deletions(-)

    --
    1.7.6.4



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