netdev - r8169 Driver - Poor Network Performance Since Kernel 4.19

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Date:   Mon, 28 Jan 2019 22:13:48 +1100
From:   Peter Ceiley <peter@...ley.net>
To:     Realtek linux nic maintainers <nic_swsd@...ltek.com>,
        Heiner Kallweit <hkallweit1@...il.com>
Cc:     netdev@...r.kernel.org
Subject: r8169 Driver - Poor Network Performance Since Kernel 4.19

Hi,

I have been experiencing very poor network performance since Kernel
4.19 and I'm confident it's related to the r8169 driver.

I have no issue with kernel versions 4.18 and prior. I am experiencing
this issue in kernels 4.19 and 4.20 (currently running/testing with
4.20.4 & 4.19.18).

If someone could guide me in the right direction, I'm happy to help
troubleshoot this issue. Note that I have been keeping an eye on one
issue related to loading of the PHY driver, however, my symptoms
differ in that I still have a network connection. I have attempted to
reload the driver on a running system, but this does not improve the
situation.

Using the proprietary r8168 driver returns my device to proper working order.

lshw shows:
       description: Ethernet interface
       product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@...0:03:00.0
       logical name: enp3s0
       version: 0c
       serial:
       size: 1Gbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix vpd bus_master cap_list
ethernet physical tp aui bnc mii fibre 10bt 10bt-fd 100bt 100bt-fd
1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8169
duplex=full firmware=rtl8168g-2_0.0.1 02/06/13 ip=192.168.1.25
latency=0 link=yes multicast=yes port=MII speed=1Gbit/s
       resources: irq:19 ioport:d000(size=256)
memory:f7b00000-f7b00fff memory:f2100000-f2103fff

Kind Regards,

Peter.