Messages in this thread | | | Subject | Re: Very slow realtek 8169 ethernet performance, but only one interface, on ThinkPad T14. | From | Qu Wenruo <> | Date | Thu, 5 Nov 2020 18:20:19 +0800 |
| |
On 2020/11/5 下午5:13, Heiner Kallweit wrote: > On 05.11.2020 08:42, Qu Wenruo wrote: >> >> >> On 2020/11/5 下午3:01, Heiner Kallweit wrote: >>> 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? >> >> Tested back to v5.7, which still shows the miserable performance. >> >> So I guess it could be a faulty adapter? >> >>> Please test >>> with the prior kernel version and report behavior (link stability and speed). >>> Under 5.9, does ethtool -S eth0 report packet errors? >>> >> Nope, no tx/rx_errors, no missed/aborted/underrun. >> >> Adding that the adapter is completely passive (no chip, just converting >> RJ45 pins to the I shaped pins), I'm not sure that the adapter itself >> can fail. >> > Each additional mechanical connection may cause reflections or other signal > disturbance. You could try to restrict the speed to 100Mbps via ethtool, > and see what the effective speed is then. 100Mbps uses two wire pairs only.
OK, you're right, now I can get around 60Mbps.
So definitely something wrong with the adapter.
Will use the RJ45 one and avoid use the ThinkPad proprietary interface.
Thanks, Qu > >> THanks, >> Qu >> >
[unhandled content-type:application/pgp-signature]
| |