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From Thorbjørn Ravn Andersen <>
Subject Re: [vfs] FTP extremely slow compared to SFTP
Date Thu, 13 Dec 2007 19:40:14 GMT
Daniel F. Savarese skrev  den 13-12-2007 17:40:
> make sense. For any network file transfer, the network I/O time
> dominates.  SFTP compresses file data (although I don't know about the
> version used by VFS) and FTP does not.  Therefore, for average files
> (i.e., not already highly compressed) SFTP should produce much better
> throughput than FTP (anywhere from a factor of 2 to 10 better depending
> on the nature of the files).
Depends on your compression method.  If the network is fast it doesn't 
take much CPU cycles/byte before the transmission is slowed down.

I did some measuring a few years ago, and found that the blowfish 
algorithm (for OpenSsh) was the least CPU-heavy.


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