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Bug#1110193: r8169 Rx very slow; r8168 works fine

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Hi Colm,

Long time no see!

On Thu, 2025-07-31 at 16:22 +0100, Colm Buckley wrote:
> Source: linux
> Version: 6.12.38+deb12
> Severity: normal
> X-Debbugs-Cc: colm@tuatha.org, nic_swsd@realtek.com, romieu@fr.zoreil.com, netdev@vger.kernel.org
> 
> Dear Maintainer,
> 
> Recent Debian kernels in the 6.12 series (in particular, from
> 6.12.33+deb12-amd64 onwards, up to and including 6.12.38+deb12-amd64)
> are causing serious slowdowns in receive performance on my (Realtek)
> ethernet connection. Regardless of protocol or connection address,
> read speed seems to be limited to between 5 and 10 Mb/s.
>
> Installing the r8168 module using r8168-dkms works fine, and read
> speeds are up to 1000Mb/s as expected.
> 
> The lspci output for this card is:
[...]

Please also provide:

- output of "lspci -vnn -s 2c:00.0" (this shows numeric IDs as well as
names)
- the kernel log for a boot using the r8169 driver
- the installed version of firmware-realtek (if any)

(In future you should use "reportbug kernel" to report a bug in the
running kernel, which will automatically such information in the
report.)

Ben.

-- 
Ben Hutchings
Experience is what causes a person to make new mistakes
instead of old ones.

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Bug#1110193: r8169 Rx very slow; r8168 works fine Colm Buckley <colm@tuatha.org> - 2025-07-31 17:30 +0200
  Processed: Re: Bug#1110193: r8169 Rx very slow; r8168 works fine "Debian Bug Tracking System" <owner@bugs.debian.org> - 2025-08-03 05:20 +0200
  Bug#1110193: r8169 Rx very slow; r8168 works fine Ben Hutchings <ben@decadent.org.uk> - 2025-08-03 05:20 +0200

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