scp/ssh between two cygwin installations very slow

[Bernhard Ege]

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 :-)

Thanks,

Bernhard Ege

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