internal network is slow speed

[afftub]

rpi4 <-> laptop support 1gpbs speed

$ iperf3 -c rpi4.address -p 12345 -f g
Connecting to host rpi4.address, port 12345
[  4] local local.address port 3929 connected to rpi4.address port 12345
[ ID] Interval           Transfer     Bandwidth
[  4]   0.00-1.00   sec   112 MBytes  0.94 Gbits/sec
[  4]   1.00-2.00   sec   113 MBytes  0.95 Gbits/sec
[  4]   2.00-3.00   sec   113 MBytes  0.95 Gbits/sec
[  4]   3.00-4.00   sec   112 MBytes  0.94 Gbits/sec
[  4]   4.00-5.00   sec   110 MBytes  0.93 Gbits/sec
[  4]   5.00-6.00   sec   113 MBytes  0.95 Gbits/sec
[  4]   6.00-7.00   sec   112 MBytes  0.94 Gbits/sec
[  4]   7.00-8.00   sec   112 MBytes  0.94 Gbits/sec
[  4]   8.00-9.00   sec   112 MBytes  0.94 Gbits/sec
[  4]   9.00-10.00  sec   112 MBytes  0.94 Gbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth
[  4]   0.00-10.00  sec  1.10 GBytes  0.94 Gbits/sec                  sender
[  4]   0.00-10.00  sec  1.10 GBytes  0.94 Gbits/sec                  receiver

---
proxmox <-> laptop is very slow "0.17 gpbs"

$ iperf3 -c proxmox.address -p 12345 -f g
Connecting to host proxmox.address, port 12345
[  4] local local.address port 3917 connected to proxmox.address port 12345
[ ID] Interval           Transfer     Bandwidth
[  4]   0.00-1.00   sec  19.1 MBytes  0.16 Gbits/sec
[  4]   1.00-2.00   sec  20.6 MBytes  0.17 Gbits/sec
[  4]   2.00-3.00   sec  20.9 MBytes  0.17 Gbits/sec
[  4]   3.00-4.01   sec  20.9 MBytes  0.17 Gbits/sec
[  4]   4.01-5.01   sec  20.8 MBytes  0.17 Gbits/sec
[  4]   5.01-6.01   sec  21.0 MBytes  0.18 Gbits/sec
[  4]   6.01-7.00   sec  20.8 MBytes  0.17 Gbits/sec
[  4]   7.00-8.00   sec  20.4 MBytes  0.17 Gbits/sec
[  4]   8.00-9.01   sec  20.6 MBytes  0.17 Gbits/sec
[  4]   9.01-10.01  sec  19.5 MBytes  0.16 Gbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth
[  4]   0.00-10.01  sec   204 MBytes  0.17 Gbits/sec                  sender
[  4]   0.00-10.01  sec   204 MBytes  0.17 Gbits/sec                  receiver

Settings for enp1s0:
        Supported ports: [ TP    MII ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
                                2500baseT/Full
        Supported pause frame use: Symmetric Receive-only
        Supports auto-negotiation: Yes
        Supported FEC modes: Not reported
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Full
                                2500baseT/Full
        Advertised pause frame use: Symmetric Receive-only
        Advertised auto-negotiation: No
        Advertised FEC modes: Not reported
        Speed: 1000Mb/s
        Duplex: Full
        Auto-negotiation: off
        master-slave cfg: preferred slave
        master-slave status: slave
        Port: Twisted Pair
        PHYAD: 0
        Transceiver: external
        MDI-X: Unknown
        Supports Wake-on: pumbg
        Wake-on: g
        Link detected: yes

$ uname -a
Linux proxmox 6.5.13-1-pve #1 SMP PREEMPT_DYNAMIC PMX 6.5.13-1 (2024-02-05T13:50Z) x86_64 GNU/Linux

realtek 8125b 2.5g lan card


The speed between the Raspberry Pi and my computer is almost 1 gbps. But proxmox is overwhelmingly slow, even with auto nego set to on. Is there any workaround?