lubancat4: 6.1.0 kernel issues: slow upload speed; full speed at version 5.10.198

[YangMame]

iperf3 test(217 is lubancat4):

┌💁  mame @ 💻  MameCOM in 📁  ~
└❯ iperf3 -c 192.168.1.217
Connecting to host 192.168.1.217, port 5201
[  5] local 192.168.1.142 port 38790 connected to 192.168.1.217 port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec   114 MBytes   956 Mbits/sec    0    440 KBytes
[  5]   1.00-2.00   sec   112 MBytes   944 Mbits/sec    0    489 KBytes
[  5]   2.00-3.00   sec   112 MBytes   938 Mbits/sec    0    489 KBytes
[  5]   3.00-4.00   sec   112 MBytes   944 Mbits/sec    0    489 KBytes
[  5]   4.00-5.00   sec   112 MBytes   937 Mbits/sec    0    510 KBytes
[  5]   5.00-6.00   sec   112 MBytes   942 Mbits/sec    0    510 KBytes
[  5]   6.00-7.00   sec   112 MBytes   941 Mbits/sec    0    510 KBytes
[  5]   7.00-8.00   sec   112 MBytes   941 Mbits/sec    0    510 KBytes
[  5]   8.00-9.00   sec   112 MBytes   943 Mbits/sec    0    510 KBytes
[  5]   9.00-10.00  sec   112 MBytes   938 Mbits/sec    0    510 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  1.10 GBytes   942 Mbits/sec    0             sender
[  5]   0.00-10.00  sec  1.10 GBytes   940 Mbits/sec                  receiver

iperf Done.

┌💁  mame @ 💻  MameCOM in 📁  ~
└❯ iperf3 -s
-----------------------------------------------------------
Server listening on 5201 (test #1)
-----------------------------------------------------------
Accepted connection from 192.168.1.217, port 53230
[  5] local 192.168.1.142 port 5201 connected to 192.168.1.217 port 53240
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-1.00   sec   512 KBytes  4.19 Mbits/sec
[  5]   1.00-2.00   sec   256 KBytes  2.10 Mbits/sec
[  5]   2.00-3.00   sec   256 KBytes  2.10 Mbits/sec
[  5]   3.00-4.00   sec  0.00 Bytes  0.00 bits/sec
[  5]   4.00-5.00   sec   128 KBytes  1.05 Mbits/sec
[  5]   5.00-6.00   sec   128 KBytes  1.05 Mbits/sec
[  5]   6.00-7.00   sec   128 KBytes  1.05 Mbits/sec
[  5]   7.00-8.00   sec   128 KBytes  1.05 Mbits/sec
[  5]   8.00-9.00   sec   128 KBytes  1.05 Mbits/sec
[  5]   9.00-10.00  sec   256 KBytes  2.10 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate
[  5]   0.00-10.00  sec  1.88 MBytes  1.57 Mbits/sec                  receiver
-----------------------------------------------------------

ethtool:

Settings for eth0:
        Supported ports: [ TP    MII ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/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
        Advertised pause frame use: Symmetric Receive-only
        Advertised auto-negotiation: Yes
        Advertised FEC modes: Not reported
        Link partner advertised link modes:  10baseT/Half 10baseT/Full
                                             100baseT/Half 100baseT/Full
                                             1000baseT/Full
        Link partner advertised pause frame use: Symmetric
        Link partner advertised auto-negotiation: Yes
        Link partner advertised FEC modes: Not reported
        Speed: 1000Mb/s
        Duplex: Full
        Auto-negotiation: on
        master-slave cfg: preferred slave
        master-slave status: slave
        Port: MII
        PHYAD: 1
        Transceiver: external
netlink error: Operation not permitted
        Current message level: 0x0000003f (63)
                               drv probe link timer ifdown ifup
        Link detected: yes

ethtool --driver:

mame@lubancat4 ~ $ ethtool --driver eth0
driver: st_gmac
version: 6.1.0-1012-rockchip
firmware-version:
expansion-rom-version:
bus-info:
supports-statistics: yes
supports-test: no
supports-eeprom-access: no
supports-register-dump: yes
supports-priv-flags: no

please let me known if you need any other info

[YangMame]

friendly ping, any progress of this bug?