Fedora development: scp has really slow transfer speed

[Mike McGrath]

> -----Original Message-----
> From: fedora-list-bounces at redhat.com 
> [mailto:fedora-list-bounces at redhat.com] On Behalf Of Kenneth Jensen
> Sent: Friday, April 29, 2005 1:17 PM
> To: fedora-list at redhat.com
> Subject: Fedora development: scp has really slow transfer speed
> 
> I just installed Fedora Development on a server that was 
> running Fedora Core 3 until this afternoon. Now I am trying 
> to copy my backup data onto the box, with scp and I realise 
> that the transfer speed is close to DSL speeds - while I am 
> on a LAN, with a 100Mbit connection to each mashine (and a GB 
> fiber based backbone).  :(
> 
> It is currently copying a 600 MB tar file at the tremendous speed of
> 82 kb/s, which will take a couple of hours... I have been 
> doing these kind of scp and rsync operations all the time, 
> and usually the transfer speeds are around 10-11 MB/s.
> 
> Anybody has an idea of what's going on?
> 
> ---
> Cheers,
> Kenneth
> 
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> 

Strange, when I scp from one machine to another I get around 2.4MB/s.
Scp does have some overhead but should not cause the slowness you are
having.  Couple of questions.  Is the SCP you are doing a copy from a
local file system to remote?

Is the connection you're using full duplex?

Are you positive you aren't dropping frames?  If you do a ping -f from
one of the machines to the other, do you get all of your responses back?

Have you done the rsync between these same two machines and gotten the
higher throughput? 


	-Mike