MichaGue

Sometimes it is usefull to write problems down to find the right solution. The answer to my question seems to be easy. Just increase the default value of
net.ipv4.tcp_rmem = 8192 873800 8738000 #(min default max) net.ipv4.tcp_wmem = 4096 655360 6553600 #(min default max) will change the TCP window size.
 
Measurements will follow.

I found the answer for my question: http://www.lemaker.org/thread-15543-1-1.html
 
Thanks a lot.