Re: Excessive TCP retransmits over lossless, high latency link

Alan Cox
2001-09-01T19:56:53Z

> Packets arrive _very_ slowly -- about 1 packet every 5.2 seconds.
> (Showing that "9600 baud" is even worse false advertising than "56k").

With my 7110 I get close to 8000bps throughput . To get that I ended up
having to fix various flow control setting so the tiny buffers on the
phone didnt keep overflowing

> The interesting thing is that there isn't any evidence of packet loss.

The modem/phone link does its own retransmit and recovery sequences. That
means that on a very flaky link you _will_ see long pauses with retransmits
at link layer going on