Rsync's Speed

[jw schultz]

On Thu, Jan 22, 2004 at 01:36:05PM -0700, Steve Sills wrote:
> Well, it is running under SSH, that could slow it down i guess....

Very easy to tell.  If ssh is burning user-mode cpu time the
encryption is a factor.

It is very unlikely the encryption is having any affect on
throughput.  Unless you are on very old hardware the network
is slower than the CPU and for rsync the disk latency likely
makes it slower than the 10MBps network.

> 
> Steve Sills
> Platnum Computers, President
> http://www.platnum.com
> steve at platnum.com
> 
> ----- Original Message ----- 
> From: "Streubert, Christoph" <Christoph.Streubert at disney.com>
> To: "Chuck Wolber" <chuckw at quantumlinux.com>; "Steve Sills"
> <steve at platnum.com>
> Cc: <rsync at lists.samba.org>
> Sent: Thursday, January 22, 2004 12:52 PM
> Subject: RE: Rsync's Speed
> 
> 
> I do not know the details of your syntax - however in case you use it -
> encryption adds a lot of overhead to the transfer process. After I
> turned off encryption (internal network with uncritical data) speeds
> increased dramatically.
> 
> C
> 
> 
> 
> -----Original Message-----
> From: Chuck Wolber [mailto:chuckw at quantumlinux.com]
> Sent: Thursday, January 22, 2004 10:30 AM
> To: Steve Sills
> Cc: rsync at lists.samba.org
> Subject: Re: Rsync's Speed
> 
> 
> 
> 
> > During my initial download for my home directory backup, it took rsync
> 
> > over 6 hours to do the initial backup, but I can FTP the stuff in
> > about 30 Mins.  Is Rsync usualy this slow? I have compression turned
> > on, and its across a 100 MB/S network, Anyone had this problem before?
> 
> In this case, I believe compression is actually slowing you down.
> 
> -Chuck
> 
> 
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-- 
________________________________________________________________
	J.W. Schultz            Pegasystems Technologies
	email address:		jw at pegasys.ws

		Remember Cernan and Schmitt