I have been trying out OpenWRT for the AVM FRITZ!Box 3490 (24.10.5, 25.12.0-rc1 and SNAPSHOTs). It seems to work fairly well. I'm aware that WiFi does not work out of the box unless one makes a custom build.
That said, I noticed that the LAN speeds are quite slow. I'm experiencing around 250-350 Mbps with quite a lot of packet loss using iperf3 to test.
Has anybody else experienced this? Is there a way to address this?
How exactly are you testing this ?
Here are some examples:
$ iperf3 -c 192.168.1.1
Connecting to host 192.168.1.1, port 5201
[ 5] local 192.168.1.222 port 57354 connected to 192.168.1.1 port 5201
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-1.00 sec 40.8 MBytes 341 Mbits/sec 0 1.07 MBytes
[ 5] 1.00-2.00 sec 37.5 MBytes 315 Mbits/sec 0 1.07 MBytes
...
[ 5] 8.00-9.00 sec 37.5 MBytes 315 Mbits/sec 0 1.07 MBytes
[ 5] 9.00-10.00 sec 37.8 MBytes 316 Mbits/sec 0 1.07 MBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.00 sec 376 MBytes 316 Mbits/sec 0 sender
[ 5] 0.00-10.00 sec 374 MBytes 313 Mbits/sec receiver
$ iperf3 -c 192.168.1.1 -R
Connecting to host 192.168.1.1, port 5201
Reverse mode, remote host 192.168.1.1 is sending
[ 5] local 192.168.1.222 port 53788 connected to 192.168.1.1 port 5201
[ ID] Interval Transfer Bitrate
[ 5] 0.00-1.00 sec 18.4 MBytes 154 Mbits/sec
[ 5] 1.00-2.00 sec 18.8 MBytes 157 Mbits/sec
...
[ 5] 8.00-9.00 sec 17.9 MBytes 150 Mbits/sec
[ 5] 9.00-10.00 sec 18.4 MBytes 154 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.01 sec 174 MBytes 146 Mbits/sec 0 sender
[ 5] 0.00-10.00 sec 174 MBytes 146 Mbits/sec receiver
If I turn on packet steering:
$ iperf3 -c 192.168.1.1
Connecting to host 192.168.1.1, port 5201
[ 5] local 192.168.1.222 port 43366 connected to 192.168.1.1 port 5201
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-1.00 sec 32.1 MBytes 269 Mbits/sec 47 228 KBytes
[ 5] 1.00-2.00 sec 31.5 MBytes 264 Mbits/sec 0 318 KBytes
...
[ 5] 8.00-9.00 sec 30.9 MBytes 259 Mbits/sec 4 286 KBytes
[ 5] 9.00-10.00 sec 31.8 MBytes 266 Mbits/sec 0 361 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.00 sec 304 MBytes 255 Mbits/sec 59 sender
[ 5] 0.00-10.01 sec 303 MBytes 254 Mbits/sec receiver
$ iperf3 -c 192.168.1.1 -R
Connecting to host 192.168.1.1, port 5201
Reverse mode, remote host 192.168.1.1 is sending
[ 5] local 192.168.1.222 port 58856 connected to 192.168.1.1 port 5201
[ ID] Interval Transfer Bitrate
[ 5] 0.00-1.00 sec 16.4 MBytes 137 Mbits/sec
[ 5] 1.00-2.00 sec 18.5 MBytes 155 Mbits/sec
...
[ 5] 8.00-9.00 sec 16.8 MBytes 141 Mbits/sec
[ 5] 9.00-10.00 sec 17.6 MBytes 148 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Retr
[ 5] 0.00-10.01 sec 176 MBytes 147 Mbits/sec 0 sender
[ 5] 0.00-10.00 sec 176 MBytes 147 Mbits/sec receiver
I've tried all the ports and different cables with the same results. I've also ensured that I get normal speeds ~930Mbits/sec with other devices with these cables.
Doing a UDP test yields the following:
$ iperf3 -c 192.168.1.1 -u -b 200M
Connecting to host 192.168.1.1, port 5201
[ 5] local 192.168.1.222 port 53453 connected to 192.168.1.1 port 5201
[ ID] Interval Transfer Bitrate Total Datagrams
[ 5] 0.00-1.00 sec 23.9 MBytes 200 Mbits/sec 17283
[ 5] 1.00-2.00 sec 23.8 MBytes 200 Mbits/sec 17265
...
[ 5] 8.00-9.00 sec 23.8 MBytes 200 Mbits/sec 17265
[ 5] 9.00-10.00 sec 23.8 MBytes 200 Mbits/sec 17266
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Jitter Lost/Total Datagrams
[ 5] 0.00-10.00 sec 238 MBytes 200 Mbits/sec 0.000 ms 0/172670 (0%) sender
[ 5] 0.00-10.00 sec 232 MBytes 194 Mbits/sec 0.020 ms 4939/172652 (2.9%) receiver
$ iperf3 -c 192.168.1.1 -u -b 100M -R
Connecting to host 192.168.1.1, port 5201
Reverse mode, remote host 192.168.1.1 is sending
[ 5] local 192.168.1.222 port 55848 connected to 192.168.1.1 port 5201
[ ID] Interval Transfer Bitrate Jitter Lost/Total Datagrams
[ 5] 0.00-1.00 sec 5.53 MBytes 46.3 Mbits/sec 0.033 ms 0/4003 (0%)
[ 5] 1.00-2.00 sec 5.31 MBytes 44.6 Mbits/sec 0.031 ms 0/3846 (0%)
...
[ 5] 8.00-9.00 sec 4.88 MBytes 40.9 Mbits/sec 0.016 ms 0/3532 (0%)
[ 5] 9.00-10.00 sec 4.89 MBytes 41.0 Mbits/sec 0.010 ms 0/3539 (0%)
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bitrate Jitter Lost/Total Datagrams
[ 5] 0.00-10.00 sec 49.9 MBytes 41.9 Mbits/sec 0.000 ms 0/36146 (0%) sender
[ 5] 0.00-10.00 sec 49.9 MBytes 41.9 Mbits/sec 0.010 ms 0/36143 (0%) receiver
Cool, now try answering the question, too.
So you're testing the router itself from a LAN client?
How did you test that?
Yes. Router (3490) [LAN port] <-- cable --> [ethernet port] device
Device1 [ethernet port] <-- cable --> [ethernet port] Device2
Both cases, I'm not using an intermediary equipment (switches, etc.).
It's not really clear what you're attempting to understand by testing the router locally - instead of i.e., a server on WAN. Can you explain?
That's normal, as you're not taxing use of the router CPUs.
You can double bandwidth by adding -Z parameter to your iperf to router. No, ath79 does not work at full gigabit for all uses.