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Bug#1111362: linux-image-6.12: Network performance regression with Realtek RTL8125 (r8169/r8125)

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Package: linux-image-6.12.0-1-amd64
Version: 6.12.0-1
Severity: important

Hello,

I am reporting a network performance regression with the Realtek RTL8125
(PCI ID [10ec:8125]) when moving from Debian 12 (Bookworm, kernel 6.1 LTS)
to Debian Trixie (kernel 6.12).

- On Debian 12 with linux-image-6.1.0-26-amd64, throughput is ~838 Mb/s
  on a gigabit Ethernet link (expected value).
- On Debian 13 with linux-image-6.12.0-1-amd64, the link still negotiates
  "Speed: 1000Mb/s, Duplex: Full" correctly, but actual throughput drops
  to ~300 Mb/s.
- I tested with both the in-kernel `r8169` driver and the external
  `r8125-dkms` package (and also Realtek’s own source release).
  The performance issue persists.

Relevant output:

lspci -nnk | grep -A3 -i net
05:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8125
2.5GbE Controller [10ec:8125] (rev 05)
        Subsystem: Realtek Semiconductor Co., Ltd. RTL8125 2.5GbE
Controller [10ec:0123]
        Kernel driver in use: r8125
        Kernel modules: r8169, r8125

ethtool enp5s0 (on Trixie):
  Speed: 1000Mb/s
  Duplex: Full
  Link detected: yes

Speed test results:
- Debian 12 (6.1): ~838 Mb/s (iperf3/wget)
- Debian 13 (6.12): ~300 Mb/s

This looks like a regression in kernel 6.12 for RTL8125.

Thanks.

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Bug#1111362: linux-image-6.12: Network performance regression with Realtek RTL8125 (r8169/r8125) Andrea - <andrea.carbonaro55@gmail.com> - 2025-08-17 14:00 +0200
  Bug#1111362: linux-image-6.12: Network performance regression with Realtek RTL8125 (r8169/r8125) Uwe Kleine-König <u.kleine-koenig@baylibre.com> - 2025-08-21 00:00 +0200

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