Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.debian.kernel > #88953

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

Cross-posted to 2 groups.

Show all headers | View raw

[Multipart message — attachments visible in raw view] - view raw

Hello,

On Sun, Aug 17, 2025 at 01:49:17PM +0200, Andrea - wrote:
> 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.

One possible culprit might be the energy saving option EEE. What is the
output of

	ethtool --show-eee enp5s0

? If this command reports EEE to be active, does

	ethtool --set-eee enp5s0 eee off

fix the performance degration?

If that doesn't help, can you please provide a full kernel log (`sudo
journalctl -k` or `sudo dmesg`)?

Best regards
Uwe

Back to linux.debian.kernel | Previous | Next | Find similar | Unroll thread

Thread

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

csiph-web