linux-kernel - Re: [PATCH v20 00/12] Implement copy offload support

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Message-ID: <20240604043242.GC28886@lst.de>
Date: Tue, 4 Jun 2024 06:32:42 +0200
From: Christoph Hellwig <hch@....de>
To: Nitesh Shetty <nj.shetty@...sung.com>
Cc: Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
	Jonathan Corbet <corbet@....net>, Alasdair Kergon <agk@...hat.com>,
	Mike Snitzer <snitzer@...nel.org>,
	Mikulas Patocka <mpatocka@...hat.com>,
	Keith Busch <kbusch@...nel.org>, Sagi Grimberg <sagi@...mberg.me>,
	Chaitanya Kulkarni <kch@...dia.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>,
	martin.petersen@...cle.com, bvanassche@....org, david@...morbit.com,
	hare@...e.de, damien.lemoal@...nsource.wdc.com,
	anuj20.g@...sung.com, joshi.k@...sung.com, nitheshshetty@...il.com,
	gost.dev@...sung.com, linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
	dm-devel@...ts.linux.dev, linux-nvme@...ts.infradead.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v20 00/12] Implement copy offload support

On Mon, Jun 03, 2024 at 10:53:39AM +0000, Nitesh Shetty wrote:
> The major benefit of this copy-offload/emulation framework is
> observed in fabrics setup, for copy workloads across the network.
> The host will send offload command over the network and actual copy
> can be achieved using emulation on the target (hence patch 4).
> This results in higher performance and lower network consumption,
> as compared to read and write travelling across the network.
> With this design of copy-offload/emulation we are able to see the
> following improvements as compared to userspace read + write on a
> NVMeOF TCP setup:

What is the use case of this?   What workloads does raw copies a lot
of data inside a single block device?