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Message-ID: <CACE9dm_3jw08_dfXRJRMQ=r4X1NZ1kHF6TZopFSNy3k+DCKgTA@mail.gmail.com> Date: Wed, 15 Jan 2014 13:56:34 +0200 From: Dmitry Kasatkin <dmitry.kasatkin@...il.com> To: nic_swsd@...ltek.com, romieu@...zoreil.com, netdev@...r.kernel.org Cc: l.moiseichuk@...sung.com Subject: throughput problems with realtek Hi, We have several devices with such adapter.. Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 06) See output of the lspci -vvv bellow... And I suddenly investigated throughput issues.. After couple minutes of running 'iperf -c server' transmission speed drops substantially... [ 4] 0.0-10.0 sec 1.10 GBytes 948 Mbits/sec [ 5] local 106.122.1.113 port 5001 connected with 106.122.1.121 port 60508 [ 5] 0.0-10.0 sec 1.10 GBytes 948 Mbits/sec [ 4] local 106.122.1.113 port 5001 connected with 106.122.1.121 port 60509 [ 4] 0.0-10.0 sec 1.10 GBytes 949 Mbits/sec [ 5] local 106.122.1.113 port 5001 connected with 106.122.1.121 port 60510 [ 5] 0.0-10.0 sec 1.10 GBytes 948 Mbits/sec [ 4] local 106.122.1.113 port 5001 connected with 106.122.1.121 port 60511 [ 4] 0.0-10.0 sec 626 MBytes 525 Mbits/sec [ 5] local 106.122.1.113 port 5001 connected with 106.122.1.121 port 60512 [ 5] 0.0-10.0 sec 84.4 MBytes 70.5 Mbits/sec [ 4] local 106.122.1.113 port 5001 connected with 106.122.1.121 port 60513 [ 4] 0.0-10.0 sec 87.4 MBytes 73.0 Mbits/sec [ 5] local 106.122.1.113 port 5001 connected with 106.122.1.121 port 60514 But it seems after certain time of inactivity (low load) speed will be up again... It happens almost the same way on desktop machines and also on Samsung Series 7 laptop NP770Z5E... Does anyone have any ideas about it? -- Thanks, Dmitry --------------------------- 03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 06) Subsystem: Samsung Electronics Co Ltd Device c0e6 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 45 Region 0: I/O ports at d000 [size=256] Region 2: Memory at f0004000 (64-bit, prefetchable) [size=4K] Region 4: Memory at f0000000 (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: 00000000fee00338 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- DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported- RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop- MaxPayload 128 bytes, MaxReadReq 4096 bytes DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr+ TransPend- LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Latency L0 unlimited, L1 <64us ClockPM+ Surprise- LLActRep- BwNot- LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- Retrain- CommClk+ ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt- DevCap2: Completion Timeout: Range ABCD, TimeoutDis+ DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis- LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis-, Selectable De-emphasis: -6dB 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 No end tag found 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- NonFatalErr- CEMsk: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+ AERCap: First Error Pointer: 00, GenCap+ CGenEn- ChkCap+ ChkEn- 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=ff Status: NegoPending- InProgress- Capabilities: [160 v1] Device Serial Number 01-00-00-00-68-4c-e0-00 Kernel driver in use: r8169 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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