On Fri, Feb 03, 2023 at 04:00:05PM +0530, Pankaj Raghav wrote:

Hi Jens,
 brd is one of the few block drivers that still uses submit_bio instead
 of blk-mq framework. The following patch converts brd to start using
 blk-mq framework. Performance gains are pretty evident for read workloads.
 The performance numbers are also attached as a part of
 the commit log.

 Performance (WD=[read|randread|write|randwrite]):
 $ modprobe brd rd_size=1048576 rd_nr=1
 $ echo "none" > /sys/block/ram0/queue/scheduler
 $ fio --name=<WD>  --ioengine=io_uring --iodepth=64 --rw=<WD> --size=1G \
   --io_size=20G --loop=4 --cpus_allowed=1 --filename=/dev/ram0 --iodepth=64
   --direct=[0/1]

  --direct=0

Can you share perf data on other non-io_uring engine often used? The
thing is that we still have lots of non-io_uring workloads, which can't
be hurt now.


Thanks
Ming