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.
V2:
- define return value of bdrv_io_unplug as void, suggested by Paolo
- avoid busy-wait for handling io_submit
V1:
- move queuing io stuff into linux-aio.c as suggested by Paolo
Thanks,
--
Ming Lei
