netdev - Re: r8169 Driver - Poor Network Performance Since Kernel 4.19

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Date:   Mon, 28 Jan 2019 19:28:06 +0100
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Peter Ceiley <peter@...ley.net>,
        Realtek linux nic maintainers <nic_swsd@...ltek.com>
Cc:     netdev@...r.kernel.org
Subject: Re: r8169 Driver - Poor Network Performance Since Kernel 4.19

On 28.01.2019 12:13, Peter Ceiley wrote:
> 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.
> 
Hi Peter,

the description "poor network performance" is quite vague, therefore:

- Can you provide any measurements?
- iperf results before and after
- statistics about dropped packets (rx and/or tx)
- Do you use jumbo packets?

Also help would be a "lspci -vv" output for the network card and
the dmesg output line with the chip XID.

Heiner