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Message-ID:	<40F2DD8B.5080406@x-ray.at>
Date:	Mon, 12 Jul 2004 20:50:51 +0200
From:	Reini Urban <rurban AT x-ray DOT at>
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To:	cygwin <cygwin AT cygwin DOT com>
Subject:	Re: rsync very slow, but not a network issue
References:	<40F2CE78 DOT 7030109 AT alexisgallagher DOT com>
In-Reply-To:	<40F2CE78.7030109@alexisgallagher.com>
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Alexis Gallagher schrieb:
> I am finding that rsync+ssh is giving extremely slow file transfers. But 
> this slowdown is hitting not when it needs to send data over the 
> network, but when it applies the rsync algorithm which is supposed to be 
> faster than sending all the data over the network. This is very puzzling.
> 
> For a benchmark, I tried transfering a 5.4 MB mp3 file three different 
> ways. Here were my results, as reported by 'scp -v' and 'rsync 
> --progress --stats':
> 
>    scp: 311000 B/s
>    rsync (file not there): 309000 B/s
>    rsync (file already there): 741 B/s
> 
> When the file is alredy there, rsync reports a speedup of about 70. 
> (When the file is not already there, the speed up is 1, of course.) I am 
> running rsync over ssh with pre-generated keys installed in my .ssh 
> directories.

This is a binary MP3.
rsync (as diff) is not good in checking binary diffs.
Please try it with a typical text file, where the patch
is smaller than the source.
-- 
Reini Urban
http://xarch.tu-graz.ac.at/home/rurban/


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