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
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