On Thu, 1 Dec 2011, Andrew Daviel wrote:
First off, this early conclusion is incorrect. RTT has basically no impact
on an ongoing TCP transfer these days since they introduced large windows
for like a decade ago.
I may be wrong, but I thought that to get significant benefit large windows
had to be enabled on every router between the source and destination, which
I did not think was the case on the public Internet.
Not exactly, but in firewalls and NATs or whatever you have in between. It is
a TCP option, not IP: http://en.wikipedia.org/wiki/TCP_window_scale_option
I don't believe this specific option is a common problem these days as current
network speeds over a single TCP connection wouldn't be achievable without it.
--
/ daniel.haxx.se