[PATCH V6 0/2] Improve virtio-blk performance

Hi, all

This version reworked on REQ_FLUSH and REQ_FUA support as suggested by
Christoph and dropped the block core bits since Jens has picked them up.

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 (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 | 306 +++++++++++++++++++++++++++++++++++++++------
 1 file changed, 268 insertions(+), 38 deletions(-)

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1.7.11.2