From: Jens Axboe <[email protected]>
To: Pavel Begunkov <[email protected]>, [email protected]
Subject: Re: [PATCH 09/16] io_uring: add option to remove SQ indirection
Date: Sat, 19 Aug 2023 09:06:54 -0600 [thread overview]
Message-ID: <[email protected]> (raw)
In-Reply-To: <0672f81d64ffe9f91835e240d8fef7a72bd895ec.1692119257.git.asml.silence@gmail.com>
On 8/15/23 11:31 AM, Pavel Begunkov wrote:
> Not many aware, but io_uring submission queue has two levels. The first
> level usually appears as sq_array and stores indexes into the actual SQ.
> To my knowledge, no one has ever seriously used it, nor liburing exposes
> it to users.
liburing does indeed not expose it, fio does use it as it's using the
raw interface. But yeah, definitely not needed for most cases and I
think this change is fine direction wise.
--
Jens Axboe
next prev parent reply other threads:[~2023-08-19 15:06 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-15 17:31 [RFC 00/16] caching and SQ/CQ optimisations Pavel Begunkov
2023-08-15 17:31 ` [PATCH 01/16] io_uring: improve cqe !tracing hot path Pavel Begunkov
2023-08-15 17:31 ` [PATCH 02/16] io_uring: cqe init hardening Pavel Begunkov
2023-08-19 15:03 ` Jens Axboe
2023-08-24 16:28 ` Pavel Begunkov
2023-08-24 16:49 ` Jens Axboe
2023-08-15 17:31 ` [PATCH 03/16] io_uring: simplify big_cqe handling Pavel Begunkov
2023-08-15 17:31 ` [PATCH 04/16] io_uring: refactor __io_get_cqe() Pavel Begunkov
2023-08-15 17:31 ` [PATCH 05/16] io_uring: optimise extra io_get_cqe null check Pavel Begunkov
2023-08-15 17:31 ` [PATCH 06/16] io_uring: reorder cqring_flush and wakeups Pavel Begunkov
2023-08-15 17:31 ` [PATCH 07/16] io_uring: merge iopoll and normal completion paths Pavel Begunkov
2023-08-15 17:31 ` [PATCH 08/16] io_uring: compact SQ/CQ heads/tails Pavel Begunkov
2023-08-19 15:05 ` Jens Axboe
2023-08-24 16:29 ` Pavel Begunkov
2023-08-15 17:31 ` [PATCH 09/16] io_uring: add option to remove SQ indirection Pavel Begunkov
2023-08-19 15:06 ` Jens Axboe [this message]
2023-08-15 17:31 ` [PATCH 10/16] io_uring: static_key for !IORING_SETUP_NO_SQARRAY Pavel Begunkov
2023-08-15 17:31 ` [PATCH 11/16] io_uring: move non aligned field to the end Pavel Begunkov
2023-08-15 17:31 ` [PATCH 12/16] io_uring: banish non-hot data to end of io_ring_ctx Pavel Begunkov
2023-08-15 17:31 ` [PATCH 13/16] io_uring: separate task_work/waiting cache line Pavel Begunkov
2023-08-15 17:31 ` [PATCH 14/16] io_uring: move multishot cqe cache in ctx Pavel Begunkov
2023-08-15 17:31 ` [PATCH 15/16] io_uring: move iopoll ctx fields around Pavel Begunkov
2023-08-15 17:31 ` [PATCH 16/16] io_uring: force inline io_fill_cqe_req Pavel Begunkov
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