On Tue, 20 Oct 2009, Matthew Hodgson wrote:
in 385ms of retransmit pauses every second. According to tcptrace, however, packet loss is clumpy, causing only a few ~7ms pauses every second.
Multiple packet loss in a short time is a very clear congestion signal to TCP. It would be very interesting to see the speed of your transfer over a few seconds, doing a packet dump and looking at the pcap file in wireshark and doing "statistics->io graph" on the tcp session can show you that. If you're saw-toothing over time then this is exactly what's happening.
Personally, I don't believe you can get good speed out of this link without changing TCP behaviour by changing code, you should instead focus your time and effort on getting to the real problem, ie fixing the packet loss.
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