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Message-ID: <20100115165447.2eb7d547@varda> Date: Fri, 15 Jan 2010 16:54:47 +0100 From: Alejandro Riveira Fernández <ariveira@...il.com> To: Anders Boström <anders@...insight.net> Cc: xiong.huang@...eros.com, jie.yang@...eros.com, linux-kernel@...r.kernel.org, ben@...adent.org.uk, netdev@...r.kernel.org Subject: Re: atl1e: TSO is broken El Fri, 15 Jan 2010 13:56:13 +0100 (CET) Anders Boström <anders@...insight.net> escribió: CCing netdev > Short desription > ---------------- > > TCP Segmentation Offload (TSO) result in broken IPv4-packets sent out > from Atheros AR8121/AR8113/AR8114 with the atl1e driver. > > > Work around > ----------- > > Turn off TSO. Requires 2.6.33-rc1 or later. > > > Long desription > ---------------- > > When I run NFS over TCP (default options) and read large files from a > server with Atheros AR8121/AR8113/AR8114 Ethernet chip, I only get > ~25Mbyte/s performance. I get ~5000 retransmitted packets per GByte > data, according to RetransSegs in /proc/net/snmp . wireshark in the > client show that the server send out a sequence of frames. All but the > last one are 1500 bytes IP-packets. The last one is shorter, but the > IP-header still say 1500 byte. The client then requests retransmit, > and the retransmitted frame arrives with correct IP-header. > > If I mount NFS using UDP instead, performance is ~110Mbyte/s. > > TCP Segmentation Offload (TSO) is default enabled in the atl1e > Ethernet-driver. When I run a patched 2.6.30.10, enabling ethtool to > turn off TSO (using ac936929092dc6a5409b627c4c67305ab9b626b3 by Ben > Hutchings), and turn off TSO, the problem disappears. Performance is > ~110Mbyte/s and no broken IP-packets arrive. > > > Capture of 146-byte Ethernet frame with bad IP-header: > > No. Time Source Destination Protocol Info > 98329 11.034129 flash.netinsight.se sid.netinsight.se RPC Continuation > > Frame 98329 (146 bytes on wire, 146 bytes captured) > Arrival Time: Jan 15, 2010 13:35:16.224491000 > [Time delta from previous captured frame: 0.000009000 seconds] > [Time delta from previous displayed frame: 0.000009000 seconds] > [Time since reference or first frame: 11.034129000 seconds] > Frame Number: 98329 > Frame Length: 146 bytes > Capture Length: 146 bytes > [Frame is marked: False] > [Protocols in frame: eth:ip:tcp:rpc] > [Coloring Rule Name: TCP] > [Coloring Rule String: tcp] > Ethernet II, Src: AsustekC_ae:69:6d (00:26:18:ae:69:6d), Dst: sid.netinsight.se (00:18:f3:52:22:3f) > Internet Protocol, Src: flash.netinsight.se (10.100.0.88), Dst: sid.netinsight.se (10.100.1.25) > Version: 4 > Header length: 20 bytes > Differentiated Services Field: 0x00 (DSCP 0x00: Default; ECN: 0x00) > Total Length: 1500 > Identification: 0x331e (13086) > Flags: 0x02 (Don't Fragment) > Fragment offset: 0 > Time to live: 64 > Protocol: TCP (0x06) > Header checksum: 0xebc5 [correct] > Source: flash.netinsight.se (10.100.0.88) > Destination: sid.netinsight.se (10.100.1.25) > Transmission Control Protocol, Src Port: nfs (2049), Dst Port: accessbuilder (888), Seq: 93989617, Ack: 516997, Len: 80 > Remote Procedure Call > > 0000 00 18 f3 52 22 3f 00 26 18 ae 69 6d 08 00 45 00 ...R"?.&..im..E. > 0010 05 dc 33 1e 40 00 40 06 eb c5 0a 64 00 58 0a 64 ..3.@.@....d.X.d > 0020 01 19 08 01 03 78 a4 07 57 23 e6 50 1f 1b 80 10 .....x..W#.P.... > 0030 01 f5 dd 8d 00 00 01 01 08 0a 05 28 ca 7e 38 93 ...........(.~8. > 0040 67 10 00 00 00 00 00 00 00 00 00 00 00 00 00 00 g............... > 0050 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > 0060 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > 0070 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > 0080 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ > 0090 00 00 .. > > > > Software info: > > I've tested with Debian 2.6.26 (stable) and 2.6.30 (testing), as well > as 2.6.30.10 from kernel.org. Same result. > > Hardware info: > > lspci -vvv: > > 03:00.0 Ethernet controller: Attansic Technology Corp. Atheros AR8121/AR8113/AR8114 PCI-E Ethernet Controller (rev b0) > Subsystem: ASUSTeK Computer Inc. Device 831c > 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 27 > Region 0: Memory at fbfc0000 (64-bit, non-prefetchable) [size=256K] > Region 2: I/O ports at ec00 [size=128] > Capabilities: [40] Power Management version 2 > Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot+,D3cold+) > Status: D0 PME-Enable- DSel=0 DScale=0 PME- > Capabilities: [48] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0 Enable+ > Address: 00000000fee0f00c Data: 4189 > Capabilities: [58] Express (v1) Endpoint, MSI 00 > DevCap: MaxPayload 4096 bytes, PhantFunc 0, Latency L0s <4us, L1 unlimited > 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 x1, ASPM L0s, Latency L0 unlimited, L1 unlimited > ClockPM- Suprise- 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- > Capabilities: [100] Advanced Error Reporting <?> > Capabilities: [180] Device Serial Number ff-18-26-00-6d-69-ae-ff > Kernel driver in use: ATL1E > Kernel modules: atl1e > > ethtool -i eth0: > > driver: ATL1E > version: 1.0.0.7-NAPI > firmware-version: L1e > bus-info: 0000:03:00.0 > > > / Anders > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ -- 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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