scp/ssh between two cygwin installations very slow

[Bernhard Ege]

Christopher Faylor wrote:
> On Mon, Apr 25, 2005 at 09:45:56PM +0200, Bernhard Ege wrote:
> 
>>Bernhard Ege wrote:
>>
>>>I am trying to copy an 800MB file from my pc to my laptop. The pc has 
>>>cygwin and cygwins sshd running and from the laptop I use the scp 
>>>command to copy the file.
>>>
>>>Result: 190kB/s with low (1-5%) cpu usage on both machines.
>>>
>>>Expected result: at least 2-3MBps with somewhat higher cpuusage on both 
>>>machines.
>>
>>Doh. I completely forgot that in my .ssh/config I had ssh call a script 
>>using the ProxyCommand. That command is a shell script that detects 
>>which network I am connected to (company or my own) and uses a tunneling 
>>ssh command to the destination if on the company network or a direct 
>>connection using "connect" if on my own network.
>>
>>The connect command is a fairly simple program that redirects 
>>stdin/stdout to a host:port. This way, I can either use a ssh to 
>>host:port if tunneling is required to connect to host:port if not.
>>
>>The problem is that cygwin has a very low throughput using the script 
>>with the connect command. I guess it could be related to the slow pipe 
>>problem mentioned earlier (but was supposedly fixed).
>>
>>I have tried without the ProxyCommand and the speed returned to an 
>>acceptable 1.5MBps.
>>
>>I hope Cygwin can be fixed so the speed returns to normal :-)
> 
> 
> Yep.  We'll get right on fixing that problem where fairly simple
> programs which redirect stdin/stdout to a host:port cause reversions in
> behavior of the "slow pipe" problem which was supposedly fixed.

It was either that kind of reply or some other reply indicating what 
additional info is required. Obviously I would submit the required 
information, but I don't know what would be relevant.

Anyway, here is the link to connect.c:

http://www.taiyo.co.jp/~gotoh/ssh/connect.html

And just create script like ssh-connect.sh:

#!/bin/bash
connect $1 $2

And in .ssh/config add the script to a destination:

ProxyCommand ssh-connect.sh %h %p


scp'in from the host which is reached through connect has its speed 
severely reduced.

It may be the problem with connect itself, but I am not sure how to test 
that.

Bernhard

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