Hi, The commit 580b6b2aa2(dataplane: use the QEMU block layer for I/O) introduces ~40% throughput regression on virtio-blk dataplane, and one of causes is that submitting I/O at batch is removed.
This patchset trys to introduce this mechanism on block, at least, linux-aio can benefit from that. With these patches, it is observed that thoughout on virtio-blk dataplane can be improved a lot, see data in commit log of patch 3/3. It should be possible to apply the batch mechanism to other devices (such as virtio-scsi) too. Thanks, -- Ming Lei
