H.K. Jerry Chu wrote:
Thanks for the prompt reply. There is no pkt loss, none, at either netem, pfifo_fast. or TCP level (from netstat -s -t). This is a back2back 1GbE link with one iperf test running.
What's the output of tcptrace -rlW?
For the 150ms delay case, tcptrace shows the TCP receive window never grows beyond ~15.5MB. That probably explains partly the low (~615Mbps) throughput.
The receive window size sounds about right, given a 20 MB max receive buffer. (1/4 is reserved for overhead.) However, I calculate a rate of about 800 Mbps.
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