joshua stein wrote: > On Thu, 14 Oct 2021 at 09:21:18 +0200, Stefan Hagen wrote: > > This ramp up time is reproducible. It always starts slower in the first > > 1 or 2 seconds and then ramps up to full speed. > > I've observed this in ethernet transfers on OpenBSD for a long time, > it's not limited to WiFi. >
I see it, but only upstream. This is the upper link speed end for the iperf3 server (FreeBSD) as well, so the test may be skewed. Ethernet: [x13](0)(~)$ iperf3 -c 192.168.1.20 Connecting to host 192.168.1.20, port 5201 [ 5] local 192.168.1.69 port 37380 connected to 192.168.1.20 port 5201 [ ID] Interval Transfer Bitrate [ 5] 0.00-1.00 sec 104 MBytes 876 Mbits/sec [ 5] 1.00-2.00 sec 104 MBytes 870 Mbits/sec [ 5] 2.00-3.00 sec 104 MBytes 870 Mbits/sec [ 5] 3.00-4.00 sec 104 MBytes 870 Mbits/sec [x13](1)(~)$ iperf3 -R -c 192.168.1.20 Connecting to host 192.168.1.20, port 5201 Reverse mode, remote host 192.168.1.20 is sending [ 5] local 192.168.1.69 port 44067 connected to 192.168.1.20 port 5201 [ ID] Interval Transfer Bitrate [ 5] 0.00-1.00 sec 78.9 MBytes 662 Mbits/sec [ 5] 1.00-2.00 sec 110 MBytes 924 Mbits/sec [ 5] 2.00-3.00 sec 111 MBytes 929 Mbits/sec [ 5] 3.00-4.00 sec 110 MBytes 926 Mbits/sec Best regards, Stefan
