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linux/drivers/nvme
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Christoph Hellwig 995457cd2a nvme-pci: reverse request order in nvme_queue_rqs 
[ Upstream commit beadf00885 ]

blk_mq_flush_plug_list submits requests in the reverse order that they
were submitted, which leads to a rather suboptimal I/O pattern especially
in rotational devices.  Fix this by rewriting nvme_queue_rqs so that it
always pops the requests from the passed in request list, and then adds
them to the head of a local submit list.  This actually simplifies the
code a bit as it removes the complicated list splicing, at the cost of
extra updates of the rq_next pointer.  As that should be cache hot
anyway it should be an easy price to pay.

Fixes: d62cbcf62f ("nvme: add support for mq_ops->queue_rqs()")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20241113152050.157179-2-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2024-12-14 19:53:16 +01:00
..
common treewide: use get_random_u32() when possible 2022-10-11 17:42:58 -06:00
host nvme-pci: reverse request order in nvme_queue_rqs 2024-12-14 19:53:16 +01:00
target nvmet-auth: assign dh_key to NULL after kfree_sensitive 2024-11-08 16:26:46 +01:00
Kconfig nvme: implement In-Band authentication 2022-08-02 17:14:49 -06:00
Makefile nvme: implement In-Band authentication 2022-08-02 17:14:49 -06:00