[c-nsp] FTP Throughput

[FS]

Joseph - TCP might not give you the right results.

http://bradhedlund.com/2008/12/19/how-to-calculate-tcp-throughput-for-long-distance-links/

Basti

On Tue, Nov 29, 2011 at 3:24 PM, Joseph Mays <mays at win.net> wrote:

> Running tests on FTP throughput from a windows ftp client across two T3
> hops to an ftp server running on FreeBSD unix. Pretty much all the
> bandwidth on both T3's is available. Total latency averages about 3ms. The
> customer on the end of the t3 is complaining that they can't get faster
> than 600KB per second anywhere. I get about 1000KB (8mbps) on a file
> transfer. I can start multiple file transfers, simultaneously, all top out
> at about that speed. The customer is demanding to know why they can't
> transfer files at, say, 40mbps. I am assuming the answer is something to do
> with TCP window size, but how do I prove that?
>
> Joe
>
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