linux

Christoph Hellwig 5198992912 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 2024-12-09 10:31:46 +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	2024-12-09 10:31:46 +01:00
target	nvme-loop: flush off pending I/O while shutting down loop controller	2024-11-17 15:08:57 +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