I'm trying to find out why one of my servers, used for fileserving, is sending files at a very slow rate, around 7 Mbits/sec, through nginx.
I've been using iperf3 to test transfer rate between servers, both on Debian 11.
- FrenchServ :
$ iperf3 -s
- CanadianServ :
$ iperf3 -c 195.154.xxx.xxx -P 1 -t 10 -b 1G // Attempts to send, using 1 connection, in 10 sec, 1GB of data
This test over TCP gives the following results :
Connecting to host 195.154.xxx.xxx, port 5201
[ 5] local 142.44.xxx.xxx port 60610 connected to 195.154.xxx.xxx port 5201
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-1.00 sec 1.04 MBytes 8.69 Mbits/sec 0 125 KBytes
[ 5] 1.00-2.00 sec 768 KBytes 6.29 Mbits/sec 0 125 KBytes
[ 5] 2.00-3.00 sec 768 KBytes 6.29 Mbits/sec 0 125 KBytes
[ 5] 3.00-4.00 sec 640 KBytes 5.24 Mbits/sec 0 125 KBytes
[ 5] 4.00-5.00 sec 768 KBytes 6.29 Mbits/sec 0 125 KBytes
[ 5] 5.00-6.00 sec 768 KBytes 6.29 Mbits/sec 0 125 KBytes
[ 5] 6.00-7.00 sec 768 KBytes 6.29 Mbits/sec 0 125 KBytes
[ 5] 7.00-8.00 sec 640 KBytes 5.24 Mbits/sec 0 125 KBytes
[ 5] 8.00-9.00 sec 768 KBytes 6.29 Mbits/sec 0 125 KBytes
[ 5] 9.00-10.00 sec 768 KBytes 6.29 Mbits/sec 0 125 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.00 sec 7.54 MBytes 6.32 Mbits/sec 0 sender
[ 5] 0.00-10.09 sec 7.08 MBytes 5.89 Mbits/sec receiver
iperf Done.
It's very slow, I may stack connections to have faster bandwidth, but would like to keep it 1 connection.
Testing over UDP now.
- CanadianServ :
$ iperf3 -c 195.154.xxx.xxx -P 1 -t 10 -b 1G -u
This outputs:
Connecting to host 195.154.xxx.xxx, port 5201
[ 5] local 142.44.xxx.xxx port 37350 connected to 195.154.xxx.xxx port 5201
[ ID] Interval Transfer Bitrate Total Datagrams
[ 5] 0.00-1.00 sec 113 MBytes 950 Mbits/sec 81331
[ 5] 1.00-2.00 sec 114 MBytes 955 Mbits/sec 81773
[ 5] 2.00-3.00 sec 114 MBytes 956 Mbits/sec 81887
[ 5] 3.00-4.00 sec 114 MBytes 957 Mbits/sec 81904
[ 5] 4.00-5.00 sec 114 MBytes 956 Mbits/sec 81862
[ 5] 5.00-6.00 sec 114 MBytes 957 Mbits/sec 81913
[ 5] 6.00-7.00 sec 114 MBytes 957 Mbits/sec 81909
[ 5] 7.00-8.00 sec 114 MBytes 957 Mbits/sec 81915
[ 5] 8.00-9.00 sec 114 MBytes 956 Mbits/sec 81880
[ 5] 9.00-10.00 sec 114 MBytes 957 Mbits/sec 81904
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Jitter Lost/Total Datagrams
[ 5] 0.00-10.00 sec 1.11 GBytes 956 Mbits/sec 0.000 ms 0/818278 (0%) sender
[ 5] 0.00-10.41 sec 600 MBytes 484 Mbits/sec 0.029 ms 387089/818278 (47%) receiver
iperf Done.
UDP actual bandwidth tops around 500 Mbits/sec, which is perfectly fine given both server's network interfaces.
How can I make TCP transfer use more bandwidth ?? I've tried on my local computer, I get around 30 Mbits/sec on TCP transfers.
