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Subject: Re: Fwd: [PATCH] cifs: add .splice_write
To: Steve French <smfrench@gmail.com>,
        linux-fsdevel <linux-fsdevel@vger.kernel.org>,
        =?UTF-8?Q?Andr=c3=a9s_Souto?= <kai670@gmail.com>
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From: Jens Axboe <axboe@kernel.dk>
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Date: Sat, 27 Jan 2018 07:31:32 -0700
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On 1/26/18 2:25 PM, Steve French wrote:
> The patch did look like it improves the performance of file copy from
> Nautilus when I tried it, but would prefer experimenting tool where I
> could measure the improvement more precisely.  Is there a good command
> line tool which generates splice_write indirectly? As expected cp and
> dd don't seem to be affected by this patch.

You can use fio with ioengine=splice. Or if you have any sendfile()
based tools, that should also do the trick, as sendfile() is just
a wrapper around splice.

-- 
Jens Axboe