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    Subject[PATCH V5 0/4] Improve virtio-blk performance
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    Hi folks,

    This version added REQ_FLUSH and REQ_FUA support as suggested by Christoph and
    rebased against latest linus's tree.

    Jens, could you please consider picking up the dependencies 1/4 and 2/4 in your
    tree. Thanks!

    This patchset implements bio-based IO path for virito-blk to improve
    performance.

    Fio test shows bio-based IO path gives the following performance improvement:

    1) Ramdisk device
    With bio-based IO path, sequential read/write, random read/write
    IOPS boost : 28%, 24%, 21%, 16%
    Latency improvement: 32%, 17%, 21%, 16%
    2) Fusion IO device
    With bio-based IO path, sequential read/write, random read/write
    IOPS boost : 11%, 11%, 13%, 10%
    Latency improvement: 10%, 10%, 12%, 10%

    Asias He (4):
    block: Introduce __blk_segment_map_sg() helper
    block: Add blk_bio_map_sg() helper
    virtio-blk: Add bio-based IO path for virtio-blk
    virtio-blk: Add REQ_FLUSH and REQ_FUA support to bio path

    block/blk-merge.c | 117 +++++++++++++------
    drivers/block/virtio_blk.c | 279 ++++++++++++++++++++++++++++++++++++++-------
    include/linux/blkdev.h | 2 +
    3 files changed, 324 insertions(+), 74 deletions(-)

    --
    1.7.11.2



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