I am getting "hw csum failure" messages with sky2. I have seen this
problem reported elsewhere with a fibre NIC, but I am using a copper
NIC. It seems to be triggered by SMP. It is easy to reproduce in
2.6.23. 2.6.24-rc2-git3 still has the problem, but it happens less
frequently.
To reproduce the problem, I am using a simple network benchmark program
that I wrote that basically does send()/recv() as fast as possible using
a memory buffer (null data, no disk I/O, no data integrity checking).
The computer with the SysKonnect NIC acts as the server. I have two
other computers with Intel PRO/1000 NICs that are directly cabled to the
two ports on the SysKonnect NIC. Each of them runs the client program,
which connects to the server, send()s 10 GB, and then recv()s 10 GB.
Essentially, both ports on the Syskonnect NIC are receiving at the
maximum rate for a few minutes, and then transmitting at the maximum
rate for a few minutes. Sustained throughput is about 117 MB/s on both
ports simultaneously.
The "hw csum failure" does not seem to affect the test. send()/recv()
continue to work normally. Nothing locks up.
I get several "hw csum failure" messages per minute on 2.6.23-SMP. The
error does not happen with 2.6.23 if I boot with "max_cpus=1". The
message seems less frequent with 2.6.24-SMP, but it still happens once
every minute or so.
The "hw csum failure" message does not happen when only one port is in
use. You have to stress both ports simultaneously to reproduce the
problem.
Another cosmetic issue is that "ifconfig" shows eth2 at IRQ 16 and eth3
at IRQ 218, when in fact both are at IRQ 218. IRQ 16 is the regular
interrupt line and IRQ 218 is the MSI interrupt. I imagine that the
driver is just reporting the IRQ incorrectly in this case. It is just a
minor cosmetic issue which doesn't break anything.
Let me know if I can be of any further assistance in tracking down this
problem.
NIC: Syskonnect SK-9E22 dual-port copper PCI-express
motherboard: SuperMicro PDSME
CPU: Pentium D 945 (dual-core 3.4 GHz)
kernel versions: 2.6.23 and 2.6.24-rc2-git3
All information below is from 2.6.24-rc2-git3.
portion of dmesg showing error:
<unknown>: hw csum failure.
[<c02c0910>] skb_copy_and_csum_datagram_iovec+0x120/0x130
[<c0180913>] __set_page_dirty+0x83/0x140
[<c02ef2c1>] tcp_rcv_established+0x981/0x9a0
[<c02f6490>] tcp_v4_do_rcv+0xc0/0x370
[<c02ba042>] release_sock+0x12/0xa0
[<c02bb0f1>] sk_wait_data+0xa1/0xd0
[<c02e3ef8>] tcp_prequeue_process+0x48/0x70
[<c02e4ea1>] tcp_recvmsg+0x671/0xc50
[<c0117bc3>] enqueue_task_fair+0x73/0xb0
[<c02ba305>] sock_common_recvmsg+0x45/0x70
[<c02b98d8>] sock_recvmsg+0xd8/0x130
[<c012eef0>] autoremove_wake_function+0x0/0x50
[<c0120d62>] __do_softirq+0x82/0x100
[<c0120f12>] irq_exit+0x52/0x90
[<c010f6b4>] smp_apic_timer_interrupt+0x54/0x80
[<c02b9c6b>] sys_recvfrom+0xeb/0x180
[<c0111cea>] read_hpet+0xa/0x10
[<c01347f0>] getnstimeofday+0x40/0xf0
[<c0118c20>] rebalance_domains+0x110/0x3e0
[<c02b9d33>] sys_recv+0x33/0x40
[<c02b9ea5>] sys_socketcall+0x165/0x280
[<c0102a4e>] sysenter_past_esp+0x5f/0x85
=======================
dmesg | grep sky2
sky2 0000:04:00.0: v1.20 addr 0xea300000 irq 16 Yukon-XL (0xb3) rev 1
sky2 0000:04:00.0: PCI Express Advanced Error Reporting not configured or
MMCONFIG problem?
sky2 eth2: addr 00:00:5a:72:b8:91
sky2 eth3: addr 00:00:5a:72:b8:92
sky2 eth2: enabling interface
sky2 eth3: enabling interface
sky2 eth2: Link is up at 1000 Mbps, full duplex, flow control both
sky2 eth3: Link is up at 1000 Mbps, full duplex, flow control both
ifconfig
eth2 Link encap:Ethernet HWaddr 00:00:5A:72:B8:91
inet addr:192.168.1.10 Bcast:192.168.1.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:34910877 errors:0 dropped:0 overruns:0 frame:0
TX packets:22659597 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:3207874526 (2.9 GiB) TX bytes:2888042042 (2.6 GiB)
Interrupt:16
eth3 Link encap:Ethernet HWaddr 00:00:5A:72:B8:92
inet addr:137.157.10.224 Bcast:137.157.255.255 Mask:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:34902414 errors:0 dropped:0 overruns:0 frame:0
TX packets:22641940 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:3207442696 (2.9 GiB) TX bytes:2886952355 (2.6 GiB)
Interrupt:218
ethtool -i eth2
driver: sky2
version: 1.20
firmware-version: N/A
bus-info: 0000:04:00.0
ethtool eth2
Settings for eth2:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Advertised auto-negotiation: Yes
Speed: 1000Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 0
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: pg
Wake-on: d
Current message level: 0x000000ff (255)
Link detected: yes
ethtool -k eth2
Offload parameters for eth2:
rx-checksumming: on
tx-checksumming: on
scatter-gather: on
tcp segmentation offload: on
ethtool -S eth2
NIC statistics:
tx_bytes: 33946810766
rx_bytes: 33901041384
tx_broadcast: 0
rx_broadcast: 1
tx_multicast: 0
rx_multicast: 0
tx_unicast: 35564726
rx_unicast: 34910876
tx_mac_pause: 0
rx_mac_pause: 0
collisions: 0
late_collision: 0
aborted: 0
single_collisions: 0
multi_collisions: 0
rx_short: 0
rx_runt: 0
rx_64_byte_packets: 13
rx_65_to_127_byte_packets: 13166182
rx_128_to_255_byte_packets: 5
rx_256_to_511_byte_packets: 6049
rx_512_to_1023_byte_packets: 23940
rx_1024_to_1518_byte_packets: 21714688
rx_1518_to_max_byte_packets: 0
rx_too_long: 0
rx_fifo_overflow: 0
rx_jabber: 0
rx_fcs_error: 0
tx_64_byte_packets: 13
tx_65_to_127_byte_packets: 10811129
tx_128_to_255_byte_packets: 873915
tx_256_to_511_byte_packets: 955169
tx_512_to_1023_byte_packets: 2245568
tx_1024_to_1518_byte_packets: 20678932
tx_1519_to_max_byte_packets: 0
tx_fifo_underrun: 0
ethtool -i eth3
driver: sky2
version: 1.20
firmware-version: N/A
bus-info: 0000:04:00.0
ethtool eth3
Settings for eth3:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Advertised auto-negotiation: Yes
Speed: 1000Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 0
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: pg
Wake-on: d
Current message level: 0x000000ff (255)
Link detected: yes
ethtool -k eth3
Offload parameters for eth3:
rx-checksumming: on
tx-checksumming: on
scatter-gather: on
tcp segmentation offload: on
ethtool -S eth3
NIC statistics:
tx_bytes: 33948750825
rx_bytes: 33900457220
tx_broadcast: 0
rx_broadcast: 137
tx_multicast: 0
rx_multicast: 0
tx_unicast: 35591358
rx_unicast: 34902277
tx_mac_pause: 0
rx_mac_pause: 0
collisions: 31
late_collision: 0
aborted: 0
single_collisions: 29
multi_collisions: 1
rx_short: 0
rx_runt: 0
rx_64_byte_packets: 64
rx_65_to_127_byte_packets: 13151060
rx_128_to_255_byte_packets: 23
rx_256_to_511_byte_packets: 7867
rx_512_to_1023_byte_packets: 36713
rx_1024_to_1518_byte_packets: 21706687
rx_1518_to_max_byte_packets: 0
rx_too_long: 0
rx_fifo_overflow: 0
rx_jabber: 0
rx_fcs_error: 0
tx_64_byte_packets: 21
tx_65_to_127_byte_packets: 10750614
tx_128_to_255_byte_packets: 945463
tx_256_to_511_byte_packets: 1004551
tx_512_to_1023_byte_packets: 2153163
tx_1024_to_1518_byte_packets: 20737546
tx_1519_to_max_byte_packets: 0
tx_fifo_underrun: 0
cat /proc/interrupts
CPU0 CPU1
0: 89 0 IO-APIC-edge timer
1: 207 0 IO-APIC-edge i8042
7: 0 0 IO-APIC-edge parport0
8: 3 0 IO-APIC-edge rtc
9: 0 0 IO-APIC-fasteoi acpi
12: 5 0 IO-APIC-edge i8042
14: 784 0 IO-APIC-edge ide0
16: 0 0 IO-APIC-fasteoi uhci_hcd:usb5
18: 0 0 IO-APIC-fasteoi uhci_hcd:usb4
19: 0 0 IO-APIC-fasteoi uhci_hcd:usb3
20: 0 0 IO-APIC-fasteoi ehci_hcd:usb1, uhci_hcd:usb2
218: 4482759 4446537 PCI-MSI-edge eth2
219: 0 0 PCI-MSI-edge ahci
NMI: 0 0 Non-maskable interrupts
LOC: 65542 48825 Local timer interrupts
RES: 226 59 Rescheduling interrupts
CAL: 80 60 function call interrupts
TLB: 22 52 TLB shootdowns
TRM: 0 0 Thermal event interrupts
SPU: 0 0 Spurious interrupts
ERR: 0
MIS: 0
lspci -vv
04:00.0 0200: 1148:9e00 (rev 14)
04:00.0 Ethernet controller: SysKonnect SK-9Exx 10/100/1000Base-T Adapter (rev
14)
Subsystem: SysKonnect SK-9E22 Server Adapter
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR+ FastB2B-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR-
Latency: 0, Cache Line Size 08
Interrupt: pin A routed to IRQ 218
Region 0: Memory at ea300000 (64-bit, non-prefetchable) [size=16K]
Region 2: I/O ports at 8000 [size=256]
[virtual] Expansion ROM at ea320000 [disabled] [size=128K]
Capabilities: [48] Power Management version 2
Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA
PME(D0+,D1+,D2+,D3hot+,D3cold+)
Status: D0 PME-Enable- DSel=0 DScale=1 PME-
Capabilities: [50] Vital Product Data
Capabilities: [5c] Message Signalled Interrupts: 64bit+ Queue=0/1
Enable+
Address: 00000000fee0200c Data: 413a
Capabilities: [e0] Express Legacy Endpoint IRQ 0
Device: Supported: MaxPayload 128 bytes, PhantFunc 0, ExtTag-
Device: Latency L0s unlimited, L1 unlimited
Device: AtnBtn- AtnInd- PwrInd-
Device: Errors: Correctable+ Non-Fatal+ Fatal+ Unsupported+
Device: RlxdOrd- ExtTag- PhantFunc- AuxPwr+ NoSnoop-
Device: MaxPayload 128 bytes, MaxReadReq 512 bytes
Link: Supported Speed 2.5Gb/s, Width x4, ASPM L0s, Port 0
Link: Latency L0s <256ns, L1 unlimited
Link: ASPM Disabled RCB 128 bytes CommClk- ExtSynch-
Link: Speed 2.5Gb/s, Width x4
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