Bug#1111011: Acknowledgement (RTL8125D - link drops)

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From	Lukasz Szotek <lukasz.szotek@infobox.com.pl>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#1111011: Acknowledgement (RTL8125D - link drops)
Date	Wed, 15 Oct 2025 10:20:01 +0200
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Tested kernels 6.15.3 and 6.17.2 too - same problem.
It has something to do with switch and/or 100Mbit vs 1Gbit:
- 1Gbit switch #3 - STABLE!!!
- 100Mbit switch #1 - drop every 90-130s
- 100Mbit switch #2 - drop every 27-28s


Linux Player1 6.15.3-porteus #1 SMP PREEMPT_DYNAMIC Sat Jun 21 15:39:51 MSK 2025 x86_64 Intel(R) N150 GenuineIntel GNU/Linux

Switch #1 10/100Mbit
[  176.299560] r8169 0000:01:00.0 eth0: Link is Down
[  178.550720] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[  319.727536] r8169 0000:01:00.0 eth0: Link is Down
[  322.020380] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[  453.172110] r8169 0000:01:00.0 eth0: Link is Down
[  455.433888] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[  547.858732] r8169 0000:01:00.0 eth0: Link is Down
[  550.120187] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[  665.213065] r8169 0000:01:00.0 eth0: Link is Down
[  667.506158] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[  755.366130] r8169 0000:01:00.0 eth0: Link is Down
[  757.617201] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[  843.657048] r8169 0000:01:00.0 eth0: Link is Down
[  845.908070] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[  958.742485] r8169 0000:01:00.0 eth0: Link is Down
[  960.993661] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[ 1194.437161] r8169 0000:01:00.0 eth0: Link is Down
[ 1196.688340] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[ 1353.865078] r8169 0000:01:00.0 eth0: Link is Down
[ 1356.451773] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[ 1460.464910] r8169 0000:01:00.0 eth0: Link is Down
[ 1462.779459] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[ 1676.804066] r8169 0000:01:00.0 eth0: Link is Down

Switch #3 1Gbit
[ 1704.272719] r8169 0000:01:00.0 eth0: Link is Up - 1Gbps/Full - flow control rx/tx - STABLE!!!


Linux Player1 6.17.2-porteus #1 SMP PREEMPT_DYNAMIC Sun Oct 12 19:23:29 MSK 2025 x86_64 Intel(R) N150 GenuineIntel GNU/Linux

Switch #2 10/100Mbit
[   36.154817] r8169 0000:01:00.0 eth0: Link is Down
[   37.797355] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[   64.447691] r8169 0000:01:00.0 eth0: Link is Down
[   66.404836] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[   92.027583] r8169 0000:01:00.0 eth0: Link is Down
[   93.659714] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[  119.041295] r8169 0000:01:00.0 eth0: Link is Down
[  120.683880] r8169 0000:01:00.0 eth0: Link is Up - 100Mbps/Full - flow control rx/tx


-- 
Pozdrawiam,
 Łukasz Szotek,
 IT Manager
 InfoBox sp. z o.o.
 43-400 Cieszyn, ul. Kraszewskiego 9
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Bug#1111011: Acknowledgement (RTL8125D - link drops) Lukasz Szotek <lukasz.szotek@infobox.com.pl> - 2025-10-15 10:20 +0200
  Bug#1111011: Acknowledgement (RTL8125D - link drops) Lukasz Szotek <lukasz.szotek@infobox.com.pl> - 2025-10-15 12:10 +0200
    Bug#1111011: Acknowledgement (RTL8125D - link drops) Uwe Kleine-König <u.kleine-koenig@baylibre.com> - 2025-10-22 17:10 +0200
    Bug#1111011: Acknowledgement (RTL8125D - link drops) Lukasz Szotek <lukasz.szotek@infobox.com.pl> - 2025-10-31 09:00 +0100
      Bug#1111011: Acknowledgement (RTL8125D - link drops) Salvatore Bonaccorso <carnil@debian.org> - 2025-11-15 11:50 +0100
        Bug#1111011: Acknowledgement (RTL8125D - link drops) Lukasz Szotek <lukasz.szotek@infobox.com.pl> - 2026-01-21 16:50 +0100
          Bug#1111011: Acknowledgement (RTL8125D - link drops) Salvatore Bonaccorso <carnil@debian.org> - 2026-01-24 13:50 +0100
            Processed: Re: Bug#1111011: Acknowledgement (RTL8125D - link drops) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-01-24 13:50 +0100
            Bug#1111011: Acknowledgement (RTL8125D - link drops) Lukasz Szotek <lukasz.szotek@infobox.com.pl> - 2026-03-23 14:20 +0100

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