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

Reply via email to