From: amnon c. <amn...@go...> - 2010-02-19 17:00:43
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Hi, I have upgraded my igb driver from version 1.3.16-k2 (kernel.org) to 2.1.1 from sourceforge. Ping times to a neighboring machine have increased from rtt min/avg/max/mdev = 0.043/0.045/0.047/0.004 ms to rtt min/avg/max/mdev = 0.052/0.055/0.065/0.002 ms The new driver was loaded with command line arguments I nterruptThrottleRate=0,0,0,0 Any ideas where these extra 10us of latency come from? Other info: Kernel version: 2.6.32 lspci -vv output: 01:00.1 Ethernet controller: Intel Corporation 82575EB Gigabit Network Connection (rev 02) Subsystem: Sun Microsystems Computer Corp. Device 0000 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 B routed to IRQ 40 Region 0: Memory at fa9e0000 (32-bit, non-prefetchable) [size=128K] Region 1: Memory at fa9c0000 (32-bit, non-prefetchable) [size=128K] Region 2: I/O ports at ac00 [size=32] Region 3: Memory at fa9bc000 (32-bit, non-prefetchable) [size=16K] Expansion ROM at fa980000 [disabled] [size=128K] Capabilities: [40] Power Management version 2 Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+) Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=1 PME- Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit+ Address: 0000000000000000 Data: 0000 Capabilities: [60] MSI-X: Enable+ Count=10 Masked- Vector table: BAR=3 offset=00000000 PBA: BAR=3 offset=00002000 Capabilities: [a0] Express (v2) Endpoint, MSI 00 DevCap: MaxPayload 256 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 512 bytes DevSta: CorrErr+ UncorrErr- FatalErr- UnsuppReq+ AuxPwr+ TransPend- LnkCap: Port #0, Speed 2.5GT/s, Width x2, ASPM L0s L1, Latency L0 <4us, 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 x2, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt- DevCap2: Completion Timeout: Range ABCD, TimeoutDis+ DevCtl2: Completion Timeout: 16ms to 55ms, 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 Kernel driver in use: igb Kernel modules: igb Thanks, Amnon |