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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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