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throughput issue dropped packet slow start


I have a 1g link and I am using iperf to test throughput. I am only getting around 20Mbps. If I use 10 parallel streams I can push 100Mbps on the link but still only 20Mbps per stream. I have to work remote so I can only capture on the device. I am guessing because of the dropped (looks like its drop at the receiving nic but i am not sure, nic reports no dropped packet and the interface also reports no dropped packet) the slow start can't reach its full potential.

Thanks for any insite you may have.