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Subject: Re: libssh2_sftp_read reads a number of bytes smaller than both the file size and the specified buffer size

Re: libssh2_sftp_read reads a number of bytes smaller than both the file size and the specified buffer size

From: Daniel Stenberg <daniel_at_haxx.se>
Date: Wed, 4 Apr 2012 08:52:18 +0200 (CEST)

On Tue, 3 Apr 2012, Adam Craig wrote:

> That still does not explain why the file downloads in 2K chunks, but that
> might have something to do with the server. I will try a different
> server-side program as soon as I can set up one.

Why is that an issue at all? That's just a detail of the libssh2
implementation and nothing that your application should worry about, right?

see src/sftp.h:

#define MAX_SFTP_READ_SIZE 2000

2K is not a magic number in any way, but I did a series of SFTP transfer
experiments with high latency high bandwidth transfers and I found this to be
a decent size. You're free to experiment with it and tell us if you get
different results. I wouldn't mind changing it if we find a better value, or
somehow make it changable if we deem that to be a good idea.

As for documentation, now that you've learned how the functions work, please
feel free to improve them and send us patches of the improvements.

-- 
  / daniel.haxx.se
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Received on 2012-04-04

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