I have a TP-Link Archer A9 v6 running OpenWrt 22.03.2 r19803-9a599fee93
The device has a 1GB WAN port and 1G ports on the switch.
My cable modem should get 500Mbps down. I verified by connecting a laptop with GB ethernet directly to the modem and got 520Mbps down.
But none of my computers connected to the router's switch ports can get more than ~200Mbps. All my wiring is up to snuff, cat 6 or better. The PCs' NICs are showing 1000Mbps link speed.
I installed iperf3 on the router and tested a few paths. With iperf3 -s running on the router, and iperf3 -c 192.xxx.xxx.xxx on any client machine, none could surpass 245Mbps. Example:
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-1.00 sec 9.17 MBytes 76.9 Mbits/sec 0 259 KBytes
[ 5] 1.00-2.00 sec 10.4 MBytes 87.0 Mbits/sec 5 273 KBytes
[ 5] 2.00-3.00 sec 17.0 MBytes 142 Mbits/sec 1 287 KBytes
[ 5] 3.00-4.00 sec 23.6 MBytes 198 Mbits/sec 0 313 KBytes
[ 5] 4.00-5.00 sec 13.2 MBytes 111 Mbits/sec 0 336 KBytes
[ 5] 5.00-6.00 sec 10.1 MBytes 85.0 Mbits/sec 3 250 KBytes
[ 5] 6.00-7.00 sec 9.83 MBytes 82.5 Mbits/sec 0 255 KBytes
[ 5] 7.00-8.00 sec 11.6 MBytes 97.5 Mbits/sec 0 262 KBytes
[ 5] 8.00-9.00 sec 18.3 MBytes 153 Mbits/sec 0 266 KBytes
[ 5] 9.00-10.00 sec 16.0 MBytes 134 Mbits/sec 0 277 KBytes
Is it odd that the bitrate jumps around so much? (Max 198Mb/s; min 76.9Mb/s)
However, if I ran iperf3 -s on one of the client machines and iperf3 -c on another client (yes, pointing to that first client), I get about 1000MBPS.
[ ID] Interval Transfer Bitrate Retr Cwnd
[ 5] 0.00-1.00 sec 114 MBytes 955 Mbits/sec 0 362 KBytes
[ 5] 1.00-2.00 sec 112 MBytes 941 Mbits/sec 0 397 KBytes
[ 5] 2.00-3.00 sec 113 MBytes 945 Mbits/sec 0 397 KBytes
[ 5] 3.00-4.00 sec 112 MBytes 941 Mbits/sec 0 397 KBytes
[ 5] 4.00-5.00 sec 112 MBytes 936 Mbits/sec 0 397 KBytes
[ 5] 5.00-6.00 sec 112 MBytes 940 Mbits/sec 0 397 KBytes
[ 5] 6.00-7.00 sec 113 MBytes 945 Mbits/sec 0 397 KBytes
[ 5] 7.00-8.00 sec 112 MBytes 943 Mbits/sec 0 397 KBytes
[ 5] 8.00-9.00 sec 112 MBytes 939 Mbits/sec 0 397 KBytes
[ 5] 9.00-10.00 sec 112 MBytes 940 Mbits/sec 0 397 KBytes
So the switch is happy to handle 1GBPS but the router can't communicate with it at 1GBPS.
I did try streaming and downloading a load of stuff at once and was unable to get the load (under status -> realtime graphs) to exceed 3.5%. The traffic on br-lan seems to max out around what iperf3 is indicating.
I USED to be a hardware guy 25 years ago, and have been a dev ever since. So I am capable but no longer knowledgeable enough to figure out whether I can configure my way out of this problem, or whether the hardware (or open-wrt's support for it) just isn't up to snuff.
Any thoughts on what I should look at here? Or how my br-lan should be configured? Currently most settings are straight 'out of the box'.