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    Subject[PATCH V7 0/2] Improve virtio-blk performance
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    Hi, all

    Changes in v7:
    - Using vbr->flags to trace request type
    - Dropped unnecessary struct virtio_blk *vblk parameter
    - Reuse struct virtblk_req in bio done function
    - Added performance data on normal SATA device and the reason why make it optional

    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%
    3) Normal SATA device
    With bio-based IO path, sequential read/write, random read/write
    IOPS boost : -10%, -10%, 4.4%, 0.5%
    Latency improvement: -12%, -15%, 2.5%, 0.8%

    Asias He (2):
    virtio-blk: Add bio-based IO path for virtio-blk
    virtio-blk: Add REQ_FLUSH and REQ_FUA support to bio path

    drivers/block/virtio_blk.c | 301 +++++++++++++++++++++++++++++++++++++++------
    1 file changed, 264 insertions(+), 37 deletions(-)

    --
    1.7.11.2



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