[6.10] Realtek RTL8125 2.5G performance degraded after upgrade

My main computer + unraid are on a 2.5G switch and both have 2.5GbE ports.

The unraid box has a realtek RTL8125 2.5GbE port on the motherboard, testing I would get full speed on 6.9.2 but after upgrading to 6.10.0 (and tested .1 + .2) the performance dropped.

iperf3 udp test:

unraid:
iperf3 -s -p 5003

from windows machine, udp w/8 connections for 10 seconds:
X:\iperf-3.1.3-win64> ./iperf3.exe -c 192.168.0.11 -p 5003 -P8 -t10 -i1 -b 3G -u

on 6.9.2  - 286 MBytes (2.40 Gbits/sec)

on 6.10.1 - 179 MBytes (1.50 Gbits/sec)

ethtool shows:

Quote

# ethtool eth0
Settings for eth0:
    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: Yes
    Advertised FEC modes: Not reported
    Link partner advertised link modes:  10baseT/Half 10baseT/Full
                                         100baseT/Half 100baseT/Full
                                         1000baseT/Half 1000baseT/Full
                                         2500baseT/Full
    Link partner advertised pause frame use: Symmetric Receive-only
    Link partner advertised auto-negotiation: Yes
    Link partner advertised FEC modes: Not reported
    Speed: 2500Mb/s
    Duplex: Full
    Auto-negotiation: on
    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: d
    Link detected: yes

 

can see the same driver loaded on 6.10.2 vs 6.9.2:

Quote

6.10.2:

 

# ethtool -i eth0
driver: r8169
version: 5.15.43-Unraid
firmware-version: rtl8125a-3_0.0.1 08/24/19
expansion-rom-version:
bus-info: 0000:04:00.0
supports-statistics: yes
supports-test: no
supports-eeprom-access: no
supports-register-dump: yes
supports-priv-flags: no

 

 

6.9.2:

 

# ethtool -i eth0
driver: r8169
version: 5.10.28-Unraid
firmware-version: rtl8125a-3_0.0.1 08/24/19
expansion-rom-version:
bus-info: 0000:04:00.0
supports-statistics: yes
supports-test: no
supports-eeprom-access: no
supports-register-dump: yes
supports-priv-flags: no

lspci shows:

Quote

04:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8125 2.5GbE Controller
    Subsystem: ASUSTeK Computer Inc. RTL8125 2.5GbE Controller
    Flags: bus master, fast devsel, latency 0, IRQ 59, IOMMU group 22
    I/O ports at e000 [size=256]
    Memory at fc710000 (64-bit, non-prefetchable) [size=64K]
    Memory at fc720000 (64-bit, non-prefetchable) [size=16K]
    Expansion ROM at fc700000 [disabled] [size=64K]
    Capabilities: [40] Power Management version 3
    Capabilities: [50] MSI: Enable- Count=1/1 Maskable+ 64bit+
    Capabilities: [70] Express Endpoint, MSI 01
    Capabilities: [b0] MSI-X: Enable+ Count=4 Masked-
    Capabilities: [d0] Vital Product Data
    Capabilities: [100] Advanced Error Reporting
    Capabilities: [148] Virtual Channel
    Capabilities: [168] Device Serial Number 01-00-00-00-68-4c-e0-00
    Capabilities: [178] Alternative Routing-ID Interpretation (ARI)
    Capabilities: [188] Single Root I/O Virtualization (SR-IOV)
    Capabilities: [1c8] Transaction Processing Hints
    Capabilities: [254] Latency Tolerance Reporting
    Capabilities: [25c] L1 PM Substates
    Capabilities: [26c] Vendor Specific Information: ID=0002 Rev=4 Len=100 <?>
    Kernel driver in use: r8169
    Kernel modules: r8169