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* throughput problems with realtek
@ 2014-01-15 11:56 Dmitry Kasatkin
  2014-01-15 12:04 ` Dmitry Kasatkin
  2014-01-15 16:23 ` Rick Jones
  0 siblings, 2 replies; 7+ messages in thread
From: Dmitry Kasatkin @ 2014-01-15 11:56 UTC (permalink / raw)
  To: nic_swsd, romieu, netdev; +Cc: l.moiseichuk

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

^ permalink raw reply	[flat|nested] 7+ messages in thread
end of thread, other threads:[~2014-01-16 18:47 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2014-01-15 11:56 throughput problems with realtek Dmitry Kasatkin
2014-01-15 12:04 ` Dmitry Kasatkin
2014-01-15 16:23 ` Rick Jones
2014-01-15 16:25   ` Dmitry Kasatkin
2014-01-15 23:51     ` Francois Romieu
2014-01-16  7:45       ` Dmitry Kasatkin
2014-01-16 18:47         ` Dmitry Kasatkin

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