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From: Jens Axboe <[email protected]>
To: [email protected], [email protected],
	[email protected]
Subject: [PATCHSET v5 0/4] Add support for list issue
Date: Thu, 16 Dec 2021 09:38:57 -0700	[thread overview]
Message-ID: <[email protected]> (raw)

Hi,

With the support in 5.16-rc1 for allocating and completing batches of
IO, the one missing piece is passing down a list of requests for issue.
Drivers can take advantage of this by defining an mq_ops->queue_rqs()
hook.

This implements it for NVMe, allowing copy of multiple commands in one
swoop.

This is good for around a 500K IOPS/core improvement in my testing,
which is around a 5-6% improvement in efficiency.

Note to Christoph - I kept the copy helper, since it's used in 3
spots and I _think_ you ended up being fine with that...

Changes since v4:
- Get rid of nvme_submit_cmd()
- Check for prev == NULL for batched issue



             reply	other threads:[~2021-12-16 16:39 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-12-16 16:38 Jens Axboe [this message]
2021-12-16 16:38 ` [PATCH 1/4] block: add mq_ops->queue_rqs hook Jens Axboe
2021-12-16 16:38 ` [PATCH 2/4] nvme: split command copy into a helper Jens Axboe
2021-12-16 17:53   ` Christoph Hellwig
2021-12-16 16:39 ` [PATCH 3/4] nvme: separate command prep and issue Jens Axboe
2021-12-16 16:39 ` [PATCH 4/4] nvme: add support for mq_ops->queue_rqs() Jens Axboe
2021-12-16 17:53   ` Christoph Hellwig

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