Re: scp/ssh between two cygwin installations very slow

[Bernhard Ege <bernhard at ege dot cc>]

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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