On Sun, 24 May 2015 13:26:52 +0200 Petter Adsen <petter@synth.no> wrote: > Thanks to you, I now get ~880Mbps, which is a lot better. It seems > increasing the MTU was what had the most effect, so I won't bother > with TCP window size. Now, this is a little odd: petter@monster:/etc$ iperf -i 1 -c fenris -r ------------------------------------------------------------ Server listening on TCP port 5001 TCP window size: 85.3 KByte (default) ------------------------------------------------------------ ------------------------------------------------------------ Client connecting to fenris, TCP port 5001 TCP window size: 280 KByte (default) ------------------------------------------------------------ [ 5] local 192.168.0.105 port 49636 connected with 192.168.0.103 port 5001 [ ID] Interval Transfer Bandwidth [ 5] 0.0- 1.0 sec 104 MBytes 875 Mbits/sec [ 5] 1.0- 2.0 sec 97.8 MBytes 820 Mbits/sec [ 5] 2.0- 3.0 sec 104 MBytes 868 Mbits/sec [ 5] 3.0- 4.0 sec 104 MBytes 876 Mbits/sec [ 5] 4.0- 5.0 sec 104 MBytes 876 Mbits/sec [ 5] 5.0- 6.0 sec 83.0 MBytes 696 Mbits/sec [ 5] 6.0- 7.0 sec 105 MBytes 879 Mbits/sec [ 5] 7.0- 8.0 sec 104 MBytes 875 Mbits/sec [ 5] 8.0- 9.0 sec 105 MBytes 884 Mbits/sec [ 5] 9.0-10.0 sec 104 MBytes 877 Mbits/sec [ 5] 0.0-10.0 sec 1016 MBytes 852 Mbits/sec [ 4] local 192.168.0.105 port 5001 connected with 192.168.0.103 port 34815 [ 4] 0.0- 1.0 sec 98.5 MBytes 826 Mbits/sec [ 4] 1.0- 2.0 sec 98.5 MBytes 826 Mbits/sec [ 4] 2.0- 3.0 sec 97.4 MBytes 817 Mbits/sec [ 4] 3.0- 4.0 sec 98.0 MBytes 822 Mbits/sec [ 4] 4.0- 5.0 sec 98.5 MBytes 827 Mbits/sec [ 4] 5.0- 6.0 sec 98.1 MBytes 823 Mbits/sec [ 4] 6.0- 7.0 sec 98.6 MBytes 827 Mbits/sec [ 4] 7.0- 8.0 sec 98.5 MBytes 826 Mbits/sec [ 4] 8.0- 9.0 sec 98.5 MBytes 827 Mbits/sec [ 4] 9.0-10.0 sec 98.5 MBytes 826 Mbits/sec [ 4] 0.0-10.0 sec 984 MBytes 825 Mbits/sec I have run it many times, and the results are consistently ~50Mbps lower in the other direction. MTU is set to 7152 on both hosts, but the window size is back to the default values (212992). Petter -- "I'm ionized" "Are you sure?" "I'm positive."
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