Date:   Tue, 29 Jan 2019 17:20:40 +1100
From:   Peter Ceiley <peter@...ley.net>
To:     Heiner Kallweit <hkallweit1@...il.com>
Cc:     Realtek linux nic maintainers <nic_swsd@...ltek.com>,
        netdev@...r.kernel.org
Subject: Re: r8169 Driver - Poor Network Performance Since Kernel 4.19

Hi Heiner,

Thanks, I'll do some more testing. It might not be the driver - I
assumed it was due to the fact that using the r8168 driver 'resolves'
the issue. I'll see if I can test the r8169.c on top of 4.19 - this is
a good idea.

Cheers,

Peter.

On Tue, 29 Jan 2019 at 17:16, Heiner Kallweit <hkallweit1@...il.com> wrote:
>
> Hi Peter,
>
> at a first glance it doesn't look like a typical driver issue.
> What you could do:
>
> - Test the r8169.c from 4.18 on top of 4.19.
>
> - Check whether disabling ASPM (/sys/module/pcie_aspm) has an effect.
>
> - Bisect between 4.18 and 4.19 to find the offending commit.
>
> Any specific reason why you think root cause is in the driver and not
> elsewhere in the network subsystem?
>
> Heiner
>
>
> On 28.01.2019 23:10, Peter Ceiley wrote:
> > Hi Heiner,
> >
> > Thanks for getting back to me.
> >
> > No, I don't use jumbo packets.
> >
> > Bandwidth is *generally* good, and iperf results to my NAS provide
> > over 900 Mbits/s in both circumstances. The issue seems to appear when
> > establishing a connection and is most notable, for example, on my
> > mounted NFS shares where it takes seconds (up to 10's of seconds on
> > larger directories) to list the contents of each directory. Once a
> > transfer begins on a file, I appear to get good bandwidth.
> >
> > I'm unsure of the best scientific data to provide you in order to
> > troubleshoot this issue. Running the following
> >
> >     netstat -s |grep retransmitted
> >
> > shows a steady increase in retransmitted segments each time I list the
> > contents of a remote directory, for example, running 'ls' on a
> > directory containing 345 media files did the following using kernel
> > 4.19.18:
> >
> > increased retransmitted segments by 21 and the 'time' command showed
> > the following:
> >     real    0m19.867s
> >     user    0m0.012s
> >     sys    0m0.036s
> >
> > The same command shows no retransmitted segments running kernel
> > 4.18.16 and 'time' showed:
> >     real    0m0.300s
> >     user    0m0.004s
> >     sys    0m0.007s
> >
> > ifconfig does not show any RX/TX errors nor dropped packets in either case.
> >
> > dmesg XID:
> > [    2.979984] r8169 0000:03:00.0 eth0: RTL8168g/8111g,
> > f8:b1:56:fe:67:e0, XID 4c000800, IRQ 32
> >
> > # lspci -vv
> > 03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
> > RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 0c)
> >     Subsystem: Dell RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
> >     Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop-
> > ParErr- Stepping- SERR- FastB2B- DisINTx+
> >     Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
> > <TAbort- <MAbort- >SERR- <PERR- INTx-
> >     Latency: 0, Cache Line Size: 64 bytes
> >     Interrupt: pin A routed to IRQ 19
> >     Region 0: I/O ports at d000 [size=256]
> >     Region 2: Memory at f7b00000 (64-bit, non-prefetchable) [size=4K]
> >     Region 4: Memory at f2100000 (64-bit, prefetchable) [size=16K]
> >     Capabilities: [40] Power Management version 3
> >         Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA
> > PME(D0+,D1+,D2+,D3hot+,D3cold+)
> >         Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
> >     Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit+
> >         Address: 0000000000000000  Data: 0000
> >     Capabilities: [70] Express (v2) Endpoint, MSI 01
> >         DevCap:    MaxPayload 128 bytes, PhantFunc 0, Latency L0s
> > <512ns, L1 <64us
> >             ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
> > SlotPowerLimit 10.000W
> >         DevCtl:    CorrErr- NonFatalErr- FatalErr- UnsupReq-
> >             RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
> >             MaxPayload 128 bytes, MaxReadReq 4096 bytes
> >         DevSta:    CorrErr+ NonFatalErr- FatalErr- UnsupReq- AuxPwr+ TransPend-
> >         LnkCap:    Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Exit
> > Latency L0s unlimited, L1 <64us
> >             ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp+
> >         LnkCtl:    ASPM L1 Enabled; RCB 64 bytes Disabled- CommClk+
> >             ExtSynch- ClockPM+ AutWidDis- BWInt- AutBWInt-
> >         LnkSta:    Speed 2.5GT/s (ok), Width x1 (ok)
> >             TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
> >         DevCap2: Completion Timeout: Range ABCD, TimeoutDis+, LTR+,
> > OBFF Via message/WAKE#
> >              AtomicOpsCap: 32bit- 64bit- 128bitCAS-
> >         DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR+,
> > OBFF Disabled
> >              AtomicOpsCtl: ReqEn-
> >         LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis-
> >              Transmit Margin: Normal Operating Range,
> > EnterModifiedCompliance- ComplianceSOS-
> >              Compliance De-emphasis: -6dB
> >         LnkSta2: Current De-emphasis Level: -6dB,
> > EqualizationComplete-, EqualizationPhase1-
> >              EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest-
> >     Capabilities: [b0] MSI-X: Enable+ Count=4 Masked-
> >         Vector table: BAR=4 offset=00000000
> >         PBA: BAR=4 offset=00000800
> >     Capabilities: [d0] Vital Product Data
> > pcilib: sysfs_read_vpd: read failed: Input/output error
> >         Not readable
> >     Capabilities: [100 v1] Advanced Error Reporting
> >         UESta:    DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt-
> > RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
> >         UEMsk:    DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt-
> > RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
> >         UESvrt:    DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt-
> > RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
> >         CESta:    RxErr+ BadTLP+ BadDLLP+ Rollover- Timeout+ AdvNonFatalErr-
> >         CEMsk:    RxErr- BadTLP- BadDLLP- Rollover- Timeout- AdvNonFatalErr+
> >         AERCap:    First Error Pointer: 00, ECRCGenCap+ ECRCGenEn-
> > ECRCChkCap+ ECRCChkEn-
> >             MultHdrRecCap- MultHdrRecEn- TLPPfxPres- HdrLogCap-
> >         HeaderLog: 00000000 00000000 00000000 00000000
> >     Capabilities: [140 v1] Virtual Channel
> >         Caps:    LPEVC=0 RefClk=100ns PATEntryBits=1
> >         Arb:    Fixed- WRR32- WRR64- WRR128-
> >         Ctrl:    ArbSelect=Fixed
> >         Status:    InProgress-
> >         VC0:    Caps:    PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
> >             Arb:    Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
> >             Ctrl:    Enable+ ID=0 ArbSelect=Fixed TC/VC=01
> >             Status:    NegoPending- InProgress-
> >     Capabilities: [160 v1] Device Serial Number 01-00-00-00-68-4c-e0-00
> >     Capabilities: [170 v1] Latency Tolerance Reporting
> >         Max snoop latency: 71680ns
> >         Max no snoop latency: 71680ns
> >     Kernel driver in use: r8169
> >     Kernel modules: r8169
> >
> > Please let me know if you have any other ideas in terms of testing.
> >
> > Thanks!
> >
> > Peter.
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > On Tue, 29 Jan 2019 at 05:28, Heiner Kallweit <hkallweit1@...il.com> wrote:
> >>
> >> 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
> >
>

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