nvme: enable batched completions of passthrough IO

Now that the normal passthrough end_io path doesn't need the request
anymore, we can kill the explicit blk_mq_free_request() and just pass
back RQ_END_IO_FREE instead. This enables the batched completion from
freeing batches of requests at the time.

This brings passthrough IO performance at least on par with bdev based
O_DIRECT with io_uring. With this and batche allocations, peak performance
goes from 110M IOPS to 122M IOPS. For IRQ based, passthrough is now also
about 10% faster than previously, going from ~61M to ~67M IOPS.

Reviewed-by: Anuj Gupta <[email protected]>
Reviewed-by: Sagi Grimberg <[email protected]>
Reviewed-by: Keith Busch <[email protected]>
Co-developed-by: Stefan Roesch <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>

0 files changed, 0 insertions, 0 deletions