linux-kernel - Re: [RFC PATCH v3 0/3] introduce io_uring_cmd_import_fixed

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Message-ID: <3c8fbd0d-b361-4da5-86e5-9ee3b909382b@gmail.com>
Date: Sun, 16 Mar 2025 07:22:08 +0000
From: Pavel Begunkov <asml.silence@...il.com>
To: Sidong Yang <sidong.yang@...iosa.ai>, Josef Bacik <josef@...icpanda.com>,
 David Sterba <dsterba@...e.com>, Jens Axboe <axboe@...nel.dk>,
 Mark Harmstone <maharmstone@...com>
Cc: linux-btrfs@...r.kernel.org, linux-kernel@...r.kernel.org,
 io-uring@...r.kernel.org
Subject: Re: [RFC PATCH v3 0/3] introduce io_uring_cmd_import_fixed_vec

On 3/15/25 17:23, Sidong Yang wrote:
> This patche series introduce io_uring_cmd_import_vec. With this function,
> Multiple fixed buffer could be used in uring cmd. It's vectored version
> for io_uring_cmd_import_fixed(). Also this patch series includes a usage
> for new api for encoded read/write in btrfs by using uring cmd.
> 
> There was approximately 10 percent of performance improvements through benchmark.
> The benchmark code is in
> https://github.com/SidongYang/btrfs-encoded-io-test/blob/main/main.c
> 
> ./main -l
> Elapsed time: 0.598997 seconds
> ./main -l -f
> Elapsed time: 0.540332 seconds

It's probably precise, but it's usually hard to judge about
performance from such short runs. Mark, do we have some benchmark
for the io_uring cmd?

-- 
Pavel Begunkov