linux-kernel - Re: [PATCH V9 0/4] fuse: Add support for passthrough read/write

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Date:   Wed, 30 Sep 2020 17:33:30 +0200
From:   Miklos Szeredi <miklos@...redi.hu>
To:     Alessio Balsini <balsini@...roid.com>
Cc:     Akilesh Kailash <akailash@...gle.com>,
        Amir Goldstein <amir73il@...il.com>,
        Antonio SJ Musumeci <trapexit@...wn.link>,
        David Anderson <dvander@...gle.com>,
        Giuseppe Scrivano <gscrivan@...hat.com>,
        Jann Horn <jannh@...gle.com>, Jens Axboe <axboe@...nel.dk>,
        Martijn Coenen <maco@...roid.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Lawrence <paullawrence@...gle.com>,
        Stefano Duo <stefanoduo@...gle.com>,
        Zimuzo Ezeozue <zezeozue@...gle.com>,
        fuse-devel <fuse-devel@...ts.sourceforge.net>,
        kernel-team <kernel-team@...roid.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V9 0/4] fuse: Add support for passthrough read/write

On Thu, Sep 24, 2020 at 3:13 PM Alessio Balsini <balsini@...roid.com> wrote:

> The first benchmarks were done by running FIO (fio-3.21) with:
> - bs=4Ki;
> - file size: 50Gi;
> - ioengine: sync;
> - fsync_on_close: true.
> The target file has been chosen large enough to avoid it to be entirely
> loaded into the page cache.
> Results are presented in the following table:
>
> +-----------+--------+-------------+--------+
> | Bandwidth |  FUSE  |     FUSE    |  Bind  |
> |  (KiB/s)  |        | passthrough |  mount |
> +-----------+--------+-------------+--------+
> | read      | 468897 |      502085 | 516830 |
> +-----------+--------+-------------+--------+
> | randread  |  15773 |       26632 |  21386 |


Have you looked into why passthrough is faster than native?

Thanks,
Miklos