On 05.11.2020 03:48, Qu Wenruo wrote:
> Hi,
>
> Not sure if this is a regression or not, but just find out that after
> upgrading to v5.9 kernel, one of my ethernet port on my ThinkPad T14 (ryzen
> version) becomes very slow.
>
> Only *2~3* Mbps.
>
> The laptop has two ethernet interfaces, one needs a passive adapter, the
> other one is a standard RJ45.
>
> The offending one is the one which needs the adapter (eth0).
> While the RJ45 one is completely fine.
>
> 02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
> RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 0e)
> 05:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
> RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 15)
>
> The 02:00.0 one is the affected one.
>
> The related dmesgs are:
> [ 38.110293] r8169 0000:02:00.0: can't disable ASPM; OS doesn't have ASPM
> control
> [ 38.126069] libphy: r8169: probed
> [ 38.126250] r8169 0000:02:00.0 eth0: RTL8168ep/8111ep, 00:2b:67:b3:d9:20,
> XID 502, IRQ 105
> [ 38.126252] r8169 0000:02:00.0 eth0: jumbo features [frames: 9194 bytes,
> tx checksumming: ko]
> [ 38.126294] r8169 0000:05:00.0: can't disable ASPM; OS doesn't have ASPM
> control
> [ 38.126300] r8169 0000:05:00.0: enabling device (0000 -> 0003)
> [ 38.139355] libphy: r8169: probed
> [ 38.139523] r8169 0000:05:00.0 eth1: RTL8168h/8111h, 00:2b:67:b3:d9:1f,
> XID 541, IRQ 107
> [ 38.139525] r8169 0000:05:00.0 eth1: jumbo features [frames: 9194 bytes,
> tx checksumming: ko]
> [ 42.120935] Generic FE-GE Realtek PHY r8169-200:00: attached PHY driver
> [Generic FE-GE Realtek PHY] (mii_bus:phy_addr=r8169-200:00, irq=IGNORE)
> [ 42.247646] r8169 0000:02:00.0 eth0: Link is Down
> [ 42.280799] Generic FE-GE Realtek PHY r8169-500:00: attached PHY driver
> [Generic FE-GE Realtek PHY] (mii_bus:phy_addr=r8169-500:00, irq=IGNORE)
> [ 42.477616] r8169 0000:05:00.0 eth1: Link is Down
> [ 76.479569] r8169 0000:02:00.0 eth0: Link is Up - 1Gbps/Full - flow
> control rx/tx
> [ 91.271894] r8169 0000:02:00.0 eth0: Link is Down
> [ 99.873390] r8169 0000:02:00.0 eth0: Link is Up - 1Gbps/Full - flow
> control rx/tx
> [ 99.878938] r8169 0000:02:00.0 eth0: Link is Down
> [ 102.579290] r8169 0000:02:00.0 eth0: Link is Up - 1Gbps/Full - flow
> control rx/tx
> [ 185.086002] r8169 0000:02:00.0 eth0: Link is Down
> [ 392.884584] r8169 0000:02:00.0 eth0: Link is Up - 1Gbps/Full - flow
> control rx/tx
> [ 392.891208] r8169 0000:02:00.0 eth0: Link is Down
> [ 395.889047] r8169 0000:02:00.0 eth0: Link is Up - 1Gbps/Full - flow
> control rx/tx
> [ 406.670738] r8169 0000:02:00.0 eth0: Link is Down
>
> Really nothing strange, even it negotiates to 1Gbps.
>
> But during iperf3, it only goes up to miserable 3Mbps.
>
> Is this some known bug or something special related to the passive adapter?
>
> Since the adapter is passive, and hasn't experience anything wrong for a long
> time, I really doubt that.
>
> Thanks,
> Qu
>
>
Thanks for the report. From which kernel version did you upgrade? Please test
with the prior kernel version and report behavior (link stability and speed).
Under 5.9, does ethtool -S eth0 report packet errors?
