[e2e] TCP un-friendly congestion control

[Craig Partridge]

In message <000001c32c54$43ec4ae0$9d350e98 at HD>, "Injong Rhee" writes:

>My definition for fast, long distance networks might have been perhaps
>too liberal. In case of 1Gbps and 50ms, its B x D is 4167 packets
>assuming 1500 byte packets. It will take around 2083 (4167 after worst
>case timeout) round trip times which is around 104 (208) seconds. If the
>delay increases to 100ms and 200ms, this becomes 6 min and 28 min. As
>you scale the bandwidth to 10G, this becomes ...well..I guess that
>should be enough. 

I don't understand your logic here.

The bandwidth*delay product is indeed around 6,250,000 bytes which is
4167 segments.

The maximum TCP window size is 2^30 which is 1,073,741,824 or at least
two orders of magnitude larger than required.

The number of round-trips required to reach this window size is approximately
18 RTTs, which is 0.9 seconds.

So... I don't see where 2083 RTTs comes from, nor 6 or 28 minutes.

Craig