On 08.06.2018 13:27, Gert Doering wrote:
Comparing
iperf3 --tcp without VPN
iperf3 --udp without VPN
iperf3 --tcp with VPN
iperf3 --udp with VPN
is relevant, because it can show if your ISP is rate-limiting UDP traffic
(thus killing OpenVPN performance). A number of them do so here in
Germany, which is very annoying.
My ISP is not used in tests at all, because I run test between two VPS,
First VPS (iperf3 client) located inside my Hetzner dedicated server
and has network connectivity 1GBit/sec, second VPS (iperf3 server)
located inside OVH "VPS SSD 1" and has network connectivity 100MBit/sec.
"iperf3 --udp" with and without OpenVPN is near 100 MBit/sec,
so all is Ok, UDP traffic is not limited at all.
"iperf3 --tcp without VPN" show speed near 100 MBit/sec:
[ 4] 0.00-10.00 sec 120 MBytes 101 Mbits/sec sender
[ 4] 0.00-10.00 sec 117 MBytes 98.2 Mbits/sec receiver
"iperf3 --tcp with VPN" show only 29 MBit/sec:
[ 4] 0.00-10.00 sec 34.7 MBytes 29.1 Mbits/sec sender
[ 4] 0.00-10.00 sec 34.4 MBytes 28.8 Mbits/sec receiver
But if I add swith "--parallel" all works fine:
# iperf3 -c 172.31.254.1 --parallel 8
[SUM] 0.00-10.00 sec 107 MBytes 90.1 Mbits/sec sender
[SUM] 0.00-10.00 sec 105 MBytes 88.4 Mbits/sec receiver
# iperf3 -c 172.31.254.1 --parallel 8 --reverse
[SUM] 0.00-10.00 sec 108 MBytes 90.5 Mbits/sec sender
[SUM] 0.00-10.00 sec 105 MBytes 88.2 Mbits/sec receiver
I can't understand why "iperf3 --tcp without VPN" show 100 MBit/sec,
but "iperf3 --tcp with VPN" show only 29 MBit/sec.
Also I can't understand why "iperf3 --tcp with VPN"
with "--parallel" switch show nead 90 MBit/sec.
CPU load on the server and client is near 10%,
so server and client is not CPU bound.
Now run test several times and see such results:
# iperf3 -c 172.31.254.1
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-10.00 sec 48.8 MBytes 40.9 Mbits/sec sender
[ 4] 0.00-10.00 sec 48.5 MBytes 40.7 Mbits/sec receiver
# iperf3 -c 172.31.254.1
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-10.00 sec 108 MBytes 90.2 Mbits/sec sender
[ 4] 0.00-10.00 sec 105 MBytes 88.3 Mbits/sec receiver
# iperf3 -c 172.31.254.1
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-10.00 sec 44.4 MBytes 37.2 Mbits/sec sender
[ 4] 0.00-10.00 sec 44.2 MBytes 37.1 Mbits/sec receiver
Speed is not fixed in 29 MBit/sec, it floating.
and I even see 90 MBit/sec with one TCP connection with VPN.
--
Best regards,
Gena
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