Slow throughput once again, speedtest-cli

Installing and Using OpenWrt Network and Wireless Configuration
1

Hey friends, how are you doing?

Today i have built up a new OpenWrt machine, using an 1 HE Supermicro Server with Xeon 1230v2 CPU, and 8GB of memory.
Furthermore i have connected the device to the network using 2 links as LACP LAG to my Cisco switch.
Now there is an issue. I've got a 1Gbps internet connection, and unfortunately i only get around 500mbps when running a speedtest on my OpenWrt device.
When i connect to the ISP VLAN directly i get the full 1Gbps. So somehow the OpenWrt device is limiting.
QoS or SQM are not enabled. But i am running mwan3.
Also the CPU load is at around 7% during downloads.

What is the best-practice way in order to troubleshoot this issue?

iperf3 on Gigabit LAN to the OpenWrt device.

Accepted connection from fdfb:9584:eb33:3:7aeb:71eb:bcd7:256b, port 57970
[  5] local fdfb:9584:eb33:3::1 port 5201 connected to fdfb:9584:eb33:3:7aeb:71eb:bcd7:256b port 57972
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-1.00   sec   110 MBytes   919 Mbits/sec                  
[  5]   1.00-2.00   sec   103 MBytes   861 Mbits/sec                  
[  5]   2.00-3.00   sec  93.9 MBytes   787 Mbits/sec                  
[  5]   3.00-4.00   sec   103 MBytes   864 Mbits/sec                  
[  5]   4.00-5.00   sec  93.9 MBytes   787 Mbits/sec                  
[  5]   5.00-6.00   sec   108 MBytes   906 Mbits/sec                  
[  5]   6.00-7.00   sec   110 MBytes   922 Mbits/sec                  
[  5]   7.00-8.00   sec   108 MBytes   904 Mbits/sec                  
[  5]   8.00-9.00   sec   110 MBytes   923 Mbits/sec                  
[  5]   9.00-10.00  sec   107 MBytes   898 Mbits/sec                  
[  5]  10.00-10.00  sec   141 KBytes   792 Mbits/sec

Thanks in advance!

root@OpenWrt:/tmp# speedtest-ookla 

   Speedtest by Ookla

     Server: myLoc managed IT AG - Dusseldorf (id = 17392)
        ISP: Vodafone Germany
    Latency:     7.27 ms   (3.32 ms jitter)
   Download:   544.40 Mbps (data used: 1.0 GB)                               
     Upload:    50.43 Mbps (data used: 25.3 MB)                               
Packet Loss:     0.0%
 Result URL: https://www.speedtest.net/result/c/1a0b0b24-3350-42ba-aadd-23dcebcc4a6e
2

Run the following and post the results...

ubus call system board; \
uci export network; uci export wireless; \
uci export dhcp; uci export firewall; \
head -n -0 /etc/firewall.user; \
ip -4 addr ; ip -4 ro li tab all ; ip -4 ru; \
ip -6 addr ; ip -6 ro li tab all ; ip -6 ru; \
ls -l  /etc/resolv.* /tmp/resolv.* /tmp/resolv.*/* ; head -n -0 /etc/resolv.* /tmp/resolv.* /tmp/resolv.*/*

Note: Redact any passwords, MAC addresses, and your public IP.

3

Alright, thanks! Here you go.
I have exceeded the allowed amount of characters. So its on pastebin now.

4

Haven't dug in too deeply, but is there some reason the MTU is set to 1420 and not 1500 in these 2 places?

17: Hub: <POINTOPOINT,NOARP,UP,LOWER_UP> mtu 1420 qdisc noqueue state UNKNOWN group default qlen 1000
inet 10.0.0.1/24 brd 10.0.0.255 scope global Hub

17: Hub: <POINTOPOINT,NOARP,UP,LOWER_UP> mtu 1420 state UNKNOWN qlen 1000
inet6 XXXX:XXX:230:5285::1/64 scope global dynamic noprefixroute
valid_lft 5419sec preferred_lft 1819sec

1 Like
6

Hey friend, thanks for your help!
I am sorry for my late reply, but there was an issue in my switched network infrastructure, so i didn't want to make any guesses before.
The issue wasn't caused by the OpenWrt device itself, but by a bad switch, producing packets with FCS errors. I have replaced it by one of my old Catalyst 2960G switches and now everything is running as expected!
Thanks a lot for your help though!