linux-kernel - Re: [PATCH] cifs: add .splice

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Message-ID: <20180126181320.hc3sz4hyrfytj5d2@Dell-XPS-L322X>
Date:   Fri, 26 Jan 2018 19:13:20 +0100
From:   Andrés Souto <kai670@...il.com>
To:     Steve French <sfrench@...ba.org>
Cc:     linux-cifs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cifs: add .splice_write

I want to explain a bit what is the problem this patch solves.

Without it, I always obtain a transfer rate below 9MB/s when writing to a cifs share using splice syscall independently of the buffer size used. However, when reading from the cifs share, I obtain around 105 MB/s.

After applying the patch, the transfer rate I obtain writing to the cifs share depending on the buffer size is:

blocksize (kB)| transfer rate (MB/s)
--------------+----------------------
           64 | 51.52
          128 | 65.41
          256 | 76.64
          512 | 85.72
         1024 | 90.21