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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 <anuj20.g@samsung.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Co-developed-by: Stefan Roesch <shr@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2022-09-22 11:41:51 -06:00
parent c0a7ba77e8
commit 851eb780de
1 changed files with 1 additions and 2 deletions
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3
drivers/nvme/host/ioctl.c
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@ -430,8 +430,7 @@ static enum rq_end_io_ret nvme_uring_cmd_end_io(struct request *req,
else
io_uring_cmd_complete_in_task(ioucmd, nvme_uring_task_cb);
blk_mq_free_request(req);
return RQ_END_IO_NONE;
return RQ_END_IO_FREE;
}
static enum rq_end_io_ret nvme_uring_cmd_end_io_meta(struct request *req,