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

Your message dated Sat, 01 Nov 2025 20:49:11 +0100 (CET)
with message-id <[🔎] 20251101194911.6A98EBE2EE7@eldamar.lan>
and subject line Closing this bug (BTS maintenance for src:linux bugs)
has caused the Debian Bug report #1111362,
regarding linux-image-6.12: Network performance regression with Realtek RTL8125 (r8169/r8125)
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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-- 
1111362: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1111362
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message ---
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.

--- End Message ---
--- Begin Message --- 
Hi

This bug was filed for a (very) old kernel or the bug is old itself
without resolution. Maybe it was for a feature enablement which nobody
acted on. We are sorry we were not able to timely deal with this issue.
There are many open bugs for the src:linux package and thus we are
closing older bugs where it's unclear if they still occur in newer
versions and are still relevant to the reporter. For an overview see:
https://bugs.debian.org/src:linux .

If you can reproduce your issue with

- the current version in unstable/testing
- the latest kernel from backports

or, if it was a feature addition/wishlist and still consider it
relevant, then:

Please reopen the bug, see https://www.debian.org/Bugs/server-control
for details.

Please try to provide as much fresh details including kernel logs where
relevant. In particular were an issue is coupled with specific hardware we
might ask you to do additional debugging on your side as the owner of the
hardware.

Regards,
Salvatore

--- End Message ---
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