em0 tx_dma_fail incrementing [SOLVED]
FF
fusionfoto at gmail.com
Sat Nov 15 16:31:30 UTC 2014
It looks like FreeBSD may be a victim of this bug:
http://www.intel.com.au/content/dam/www/public/us/en/documents/specification-updates/82574-gbe-controller-spec-update.pdf
17. Tx Data Corruption When Using TCP Segmentation Offload
Problem: When using TSO, a situation can occur where a PCIe MRd request is
repeated with the
same address, resulting in data corruption. At the end of the TCP packet,
the Tx DMA
hangs because the length doesn't match. This can only occur when the
following are
true:
• The first buffer of the packet is larger than [3 * (max_read_request -
4)].
• There is a 4 KB boundary within 64 bytes following the end of the header
bytes in
the buffer
Implication: Possible data corruption since a TCP packet is transmitted
containing the wrong data but
with the correct checksum.
Data transmission halts as the Tx DMA module enters a hang state.
Workaround: The failure can be avoided by ensuring at least one of the
following:
• The buffer containing the headers should not be larger than [3 *
(max_read_request - 4)]. To meet this requirement even for the minimum
value of
128 bytes for max_read_request, the buffer should not be larger than 372
bytes.
• The alignment of the buffer containing the headers should be such that
there is no
4 KB boundary within 64 bytes following the end of the header bytes.
Assuming
standard Ethernet/IP/TCP headers of 54 bytes, this means that the buffer
should
not start 54-118 bytes before a 4 KB boundary. For example, 128-byte
alignment
for this buffer could be used to fulfill this condition.
This problem has not been reported when using an Intel Linux* or Windows*
drivers.
Current analysis shows it is very unlikely for a situation to exist that
would cause the
82574 to be at risk for the errata when using the Intel Linux or Windows
drivers.
Linux and other distros seem to have fixed it. This could be getting
exercised because FreeBSD recently changed the default buffer size above
256 for this driver.
Since I didn't want to reboot to try the lower buffer size, I turned off
TSO on all the machines that I'd checked that were actively incrementing
tx_dma_fail for em interfaces then re-enabled their membership into the
LACP.
In brief testing, (few gigabits for a few minutes) tx_dma_fail has not
incremented and throughput has not been negatively impacted (before vs
after re-enable).
This is so anyone else who is scratching their head about why em
performance is terrible can solve it.
Best,
FF
On Thu, Nov 13, 2014 at 1:52 PM, FF <fusionfoto at gmail.com> wrote:
>
> What knob do I need to turn to address this?
>
> This em0 is in an LACP bundle with an igb0 that isn't showing this problem.
>
> dev.em.0.%desc: Intel(R) PRO/1000 Network Connection 7.3.8
> dev.em.0.%driver: em
> dev.em.0.%location: slot=25 function=0 handle=\_SB_.PCI0.GLAN
> dev.em.0.%pnpinfo: vendor=0x8086 device=0x153b subvendor=0x15d9
> subdevice=0x153b class=0x020000
> dev.em.0.%parent: pci0
> dev.em.0.nvm: -1
> dev.em.0.debug: -1
> dev.em.0.fc: 3
> dev.em.0.rx_int_delay: 0
> dev.em.0.tx_int_delay: 66
> dev.em.0.rx_abs_int_delay: 66
> dev.em.0.tx_abs_int_delay: 66
> dev.em.0.itr: 488
> dev.em.0.rx_processing_limit: 100
> dev.em.0.eee_control: 1
> dev.em.0.link_irq: 0
> dev.em.0.mbuf_alloc_fail: 52
> dev.em.0.cluster_alloc_fail: 0
> dev.em.0.dropped: 0
> **
> dev.em.0.tx_dma_fail: 1834648
> dev.em.0.rx_overruns: 3109
> **
> dev.em.0.watchdog_timeouts: 0
> dev.em.0.device_control: 1209532992
> dev.em.0.rx_control: 67141634
> dev.em.0.fc_high_water: 23584
> dev.em.0.fc_low_water: 20552
> dev.em.0.queue0.txd_head: 577
> dev.em.0.queue0.txd_tail: 577
> dev.em.0.queue0.tx_irq: 0
> dev.em.0.queue0.no_desc_avail: 0
> dev.em.0.queue0.rxd_head: 967
> dev.em.0.queue0.rxd_tail: 966
> dev.em.0.queue0.rx_irq: 0
> dev.em.0.mac_stats.excess_coll: 0
> dev.em.0.mac_stats.single_coll: 0
> dev.em.0.mac_stats.multiple_coll: 0
> dev.em.0.mac_stats.late_coll: 0
> dev.em.0.mac_stats.collision_count: 0
> dev.em.0.mac_stats.symbol_errors: 0
> dev.em.0.mac_stats.sequence_errors: 0
> dev.em.0.mac_stats.defer_count: 0
> dev.em.0.mac_stats.missed_packets: 61094
> dev.em.0.mac_stats.recv_no_buff: 60008
> dev.em.0.mac_stats.recv_undersize: 0
> dev.em.0.mac_stats.recv_fragmented: 0
> dev.em.0.mac_stats.recv_oversize: 0
> dev.em.0.mac_stats.recv_jabber: 0
> dev.em.0.mac_stats.recv_errs: 0
> dev.em.0.mac_stats.crc_errs: 0
> dev.em.0.mac_stats.alignment_errs: 0
> dev.em.0.mac_stats.coll_ext_errs: 0
> dev.em.0.mac_stats.xon_recvd: 40226659
> dev.em.0.mac_stats.xon_txd: 2132
> dev.em.0.mac_stats.xoff_recvd: 40241216
> dev.em.0.mac_stats.xoff_txd: 2073563
> dev.em.0.mac_stats.total_pkts_recvd: 3219537541
> dev.em.0.mac_stats.good_pkts_recvd: 3139008594
> dev.em.0.mac_stats.bcast_pkts_recvd: 3953817
> dev.em.0.mac_stats.mcast_pkts_recvd: 607157
> dev.em.0.mac_stats.rx_frames_64: 0
> dev.em.0.mac_stats.rx_frames_65_127: 0
> dev.em.0.mac_stats.rx_frames_128_255: 0
> dev.em.0.mac_stats.rx_frames_256_511: 0
> dev.em.0.mac_stats.rx_frames_512_1023: 0
> dev.em.0.mac_stats.rx_frames_1024_1522: 0
> dev.em.0.mac_stats.good_octets_recvd: 3527296369841
> dev.em.0.mac_stats.good_octets_txd: 14348531993101
> dev.em.0.mac_stats.total_pkts_txd: 10735190291
> dev.em.0.mac_stats.good_pkts_txd: 10733114595
> dev.em.0.mac_stats.bcast_pkts_txd: 14
> dev.em.0.mac_stats.mcast_pkts_txd: 54334
> dev.em.0.mac_stats.tx_frames_64: 0
> dev.em.0.mac_stats.tx_frames_65_127: 0
> dev.em.0.mac_stats.tx_frames_128_255: 0
> dev.em.0.mac_stats.tx_frames_256_511: 0
> dev.em.0.mac_stats.tx_frames_512_1023: 0
> dev.em.0.mac_stats.tx_frames_1024_1522: 0
> dev.em.0.mac_stats.tso_txd: 902605586
> dev.em.0.mac_stats.tso_ctx_fail: 0
> dev.em.0.interrupts.asserts: 1392541431
> dev.em.0.interrupts.rx_pkt_timer: 0
> dev.em.0.interrupts.rx_abs_timer: 0
> dev.em.0.interrupts.tx_pkt_timer: 0
> dev.em.0.interrupts.tx_abs_timer: 0
> dev.em.0.interrupts.tx_queue_empty: 0
> dev.em.0.interrupts.tx_queue_min_thresh: 0
> dev.em.0.interrupts.rx_desc_min_thresh: 0
> dev.em.0.interrupts.rx_overrun: 0
> dev.em.0.wake: 0
>
> dev.igb.0.%desc: Intel(R) PRO/1000 Network Connection version - 2.3.10
> dev.igb.0.%driver: igb
> dev.igb.0.%location: slot=0 function=0 handle=\_SB_.PCI0.RP04.PXSX
> dev.igb.0.%pnpinfo: vendor=0x8086 device=0x1533 subvendor=0x15d9
> subdevice=0x1533 class=0x020000
> dev.igb.0.%parent: pci5
> dev.igb.0.nvm: -1
> dev.igb.0.enable_aim: 1
> dev.igb.0.fc: 3
> dev.igb.0.rx_processing_limit: 100
> dev.igb.0.dmac: 0
> dev.igb.0.eee_disabled: 0
> dev.igb.0.link_irq: 33
> dev.igb.0.dropped: 0
> dev.igb.0.tx_dma_fail: 0
> dev.igb.0.rx_overruns: 0
> dev.igb.0.watchdog_timeouts: 0
> dev.igb.0.device_control: 1209795137
> dev.igb.0.rx_control: 71335938
> dev.igb.0.interrupt_mask: 4
> dev.igb.0.extended_int_mask: 2147483679
> dev.igb.0.tx_buf_alloc: 0
> dev.igb.0.rx_buf_alloc: 0
> dev.igb.0.fc_high_water: 31328
> dev.igb.0.fc_low_water: 31312
> dev.igb.0.queue0.no_desc_avail: 0
> dev.igb.0.queue0.tx_packets: 62464141
> dev.igb.0.queue0.rx_packets: 73012939
> dev.igb.0.queue0.rx_bytes: 22529663814
> dev.igb.0.queue0.lro_queued: 0
> dev.igb.0.queue0.lro_flushed: 0
> dev.igb.0.queue1.no_desc_avail: 0
> dev.igb.0.queue1.tx_packets: 404298046
> dev.igb.0.queue1.rx_packets: 307675818
> dev.igb.0.queue1.rx_bytes: 185919902229
> dev.igb.0.queue1.lro_queued: 0
> dev.igb.0.queue1.lro_flushed: 0
> dev.igb.0.queue2.no_desc_avail: 0
> dev.igb.0.queue2.tx_packets: 3441053015
> dev.igb.0.queue2.rx_packets: 5511826751
> dev.igb.0.queue2.rx_bytes: 3054219311510
> dev.igb.0.queue2.lro_queued: 0
> dev.igb.0.queue2.lro_flushed: 0
> dev.igb.0.queue3.no_desc_avail: 0
> dev.igb.0.queue3.tx_packets: 1047838830
> dev.igb.0.queue3.rx_packets: 1987495318
> dev.igb.0.queue3.rx_bytes: 2696179247028
> dev.igb.0.queue3.lro_queued: 0
> dev.igb.0.queue3.lro_flushed: 0
> dev.igb.0.mac_stats.excess_coll: 0
> dev.igb.0.mac_stats.single_coll: 0
> dev.igb.0.mac_stats.multiple_coll: 0
> dev.igb.0.mac_stats.late_coll: 0
> dev.igb.0.mac_stats.collision_count: 0
> dev.igb.0.mac_stats.symbol_errors: 0
> dev.igb.0.mac_stats.sequence_errors: 0
> dev.igb.0.mac_stats.defer_count: 283811
> dev.igb.0.mac_stats.missed_packets: 9449
> dev.igb.0.mac_stats.recv_no_buff: 340
> dev.igb.0.mac_stats.recv_undersize: 0
> dev.igb.0.mac_stats.recv_fragmented: 0
> dev.igb.0.mac_stats.recv_oversize: 0
> dev.igb.0.mac_stats.recv_jabber: 0
> dev.igb.0.mac_stats.recv_errs: 0
> dev.igb.0.mac_stats.crc_errs: 0
> dev.igb.0.mac_stats.alignment_errs: 0
> dev.igb.0.mac_stats.coll_ext_errs: 0
> dev.igb.0.mac_stats.xon_recvd: 46255557
> dev.igb.0.mac_stats.xon_txd: 261
> dev.igb.0.mac_stats.xoff_recvd: 46255994
> dev.igb.0.mac_stats.xoff_txd: 7027
> dev.igb.0.mac_stats.total_pkts_recvd: 7975033582
> dev.igb.0.mac_stats.good_pkts_recvd: 7880001465
> dev.igb.0.mac_stats.bcast_pkts_recvd: 5783868
> dev.igb.0.mac_stats.mcast_pkts_recvd: 563315
> dev.igb.0.mac_stats.rx_frames_64: 28412906
> dev.igb.0.mac_stats.rx_frames_65_127: 3310187919
> dev.igb.0.mac_stats.rx_frames_128_255: 784920450
> dev.igb.0.mac_stats.rx_frames_256_511: 17225962
> dev.igb.0.mac_stats.rx_frames_512_1023: 73415350
> dev.igb.0.mac_stats.rx_frames_1024_1522: 3665838878
> dev.igb.0.mac_stats.good_octets_recvd: 5990356613544
> dev.igb.0.mac_stats.good_octets_txd: 46326753008181
> dev.igb.0.mac_stats.total_pkts_txd: 33016014138
> dev.igb.0.mac_stats.good_pkts_txd: 33016006850
> dev.igb.0.mac_stats.bcast_pkts_txd: 834
> dev.igb.0.mac_stats.mcast_pkts_txd: 54331
> dev.igb.0.mac_stats.tx_frames_64: 30741691
> dev.igb.0.mac_stats.tx_frames_65_127: 2174824217
> dev.igb.0.mac_stats.tx_frames_128_255: 139804927
> dev.igb.0.mac_stats.tx_frames_256_511: 59190261
> dev.igb.0.mac_stats.tx_frames_512_1023: 386886648
> dev.igb.0.mac_stats.tx_frames_1024_1522: 30224559106
> dev.igb.0.mac_stats.tso_txd: 2384636909
> dev.igb.0.mac_stats.tso_ctx_fail: 0
> dev.igb.0.interrupts.asserts: 4556119857
> dev.igb.0.interrupts.rx_pkt_timer: 7879778770
> dev.igb.0.interrupts.rx_abs_timer: 0
> dev.igb.0.interrupts.tx_pkt_timer: 0
> dev.igb.0.interrupts.tx_abs_timer: 0
> dev.igb.0.interrupts.tx_queue_empty: 33015268817
> dev.igb.0.interrupts.tx_queue_min_thresh: 7880001470
> dev.igb.0.interrupts.rx_desc_min_thresh: 0
> dev.igb.0.interrupts.rx_overrun: 0
> dev.igb.0.host.breaker_tx_pkt: 0
> dev.igb.0.host.host_tx_pkt_discard: 0
> dev.igb.0.host.rx_pkt: 222702
> dev.igb.0.host.breaker_rx_pkts: 0
> dev.igb.0.host.breaker_rx_pkt_drop: 0
> dev.igb.0.host.tx_good_pkt: 738033
> dev.igb.0.host.breaker_tx_pkt_drop: 0
> dev.igb.0.host.rx_good_bytes: 5990357073320
> dev.igb.0.host.tx_good_bytes: 46326753008181
> dev.igb.0.host.length_errors: 0
> dev.igb.0.host.serdes_violation_pkt: 0
> dev.igb.0.host.header_redir_missed: 0
> dev.igb.0.wake: 0
>
>
> hw.em.eee_setting: 1
> hw.em.rx_process_limit: 100
> hw.em.enable_msix: 1
> hw.em.sbp: 0
> hw.em.smart_pwr_down: 0
> hw.em.txd: 1024
> hw.em.rxd: 1024
> hw.em.rx_abs_int_delay: 66
> hw.em.tx_abs_int_delay: 66
> hw.em.rx_int_delay: 0
> hw.em.tx_int_delay: 66
>
> hw.igb.rx_process_limit: 100
> hw.igb.num_queues: 0
> hw.igb.header_split: 0
> hw.igb.buf_ring_size: 4096
> hw.igb.max_interrupt_rate: 8000
> hw.igb.enable_msix: 1
> hw.igb.enable_aim: 1
> hw.igb.txd: 1024
> hw.igb.rxd: 1024
>
> FreeBSD systemname.com 9.2-RELEASE-p10 FreeBSD 9.2-RELEASE-p10 #0
> r270148M: Mon Aug 18 23:14:36 EDT 2014 root at peta108:/usr/obj/usr/src/sys/CUSTOM10
> amd64
>
> em0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
>
> options=4019b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,VLAN_HWTSO>
> ether 00:25:90:f2:2d:24
> inet6 fe80::225:90ff:fef2:2d24%em0 prefixlen 64 scopeid 0x2
> nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
> media: Ethernet autoselect (1000baseT <full-duplex>)
> status: active
> igb0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
>
> options=401bb<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,TSO4,VLAN_HWTSO>
> ether 00:25:90:f2:2d:24
> inet6 fe80::225:90ff:fef2:2d25%igb0 prefixlen 64 scopeid 0x4
> nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
> media: Ethernet autoselect (1000baseT <full-duplex>)
> status: active
> lo0: flags=8049<UP,LOOPBACK,RUNNING,MULTICAST> metric 0 mtu 16384
> options=600003<RXCSUM,TXCSUM,RXCSUM_IPV6,TXCSUM_IPV6>
> inet6 ::1 prefixlen 128
> inet6 fe80::1%lo0 prefixlen 64 scopeid 0x7
> inet 127.0.0.1 netmask 0xff000000
> nd6 options=21<PERFORMNUD,AUTO_LINKLOCAL>
> lagg0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500
>
> options=4019b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING,VLAN_HWCSUM,TSO4,VLAN_HWTSO>
> ether 00:25:90:f2:2d:24
> inet 192.168.0.108 netmask 0xffffff00 broadcast 192.168.0.255
> inet6 fe80::225:90ff:fef2:2d24%lagg0 prefixlen 64 scopeid 0x8
> nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
> media: Ethernet autoselect
> status: active
> laggproto lacp lagghash l2,l3,l4
> laggport: igb0 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING>
> laggport: em0 flags=1c<ACTIVE,COLLECTING,DISTRIBUTING>
>
> Thanks in advance!
>
> --
> FF
>
--
FF
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