[lkml]   [2007]   [Jul]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: [patch] revert: [NET]: Fix races in net_rx_action vs netpoll

    * Ingo Molnar <> wrote:

    > the e1000 in this laptop is historically pretty robust. The only
    > problem i ever had with it were some rx/tx hw-engine latency problems
    > [pings from the outside took up to 1 second to propagate] that were
    > quickly fixed by the e1000 driver guys. Maybe that's related.
    > (although it never caused total inavailability of networking - it was
    > only latency problems)

    i've Cc:-ed Auke - maybe he has some ideas? I've also attached all the
    other possibly relevant ethtool dumps of eth0 below, done when the hung
    interface happens. (Auke, see more details about this problem in this
    thread on lkml.)

    another thing: how can i make the tx timeout much longer than it is
    right now? Maybe an interrupt is delayed for long and we just dont
    tolerate things long enough - and once the device tx timeout has been
    noticed we kill the interface from subsequent use in essence?

    there's one oddity i noticed:

    0x02810: RDH (Receive desc head) 0x00000000
    0x02818: RDT (Receive desc tail) 0x000000FE

    0x03810: TDH (Transmit desc head) 0x00000000
    0x03818: TDT (Transmit desc tail) 0x00000000

    doesnt this suggest that we have a receive packet, just the irq didnt
    come and we didnt process it?

    although .. the tx timeout disabled the transmitter and the receiver of
    the device, correct? That in itself could have destroyed any evidence of
    what happened earlier on. But ... i'm really only guessing here.



    MAC Registers
    0x00000: CTRL (Device control register) 0x00140248
    Endian mode (buffers): little
    Link reset: reset
    Set link up: 1
    Invert Loss-Of-Signal: no
    Receive flow control: disabled
    Transmit flow control: disabled
    VLAN mode: disabled
    Auto speed detect: disabled
    Speed select: 1000Mb/s
    Force speed: no
    Force duplex: no
    0x00008: STATUS (Device status register) 0x80080783
    Duplex: full
    Link up: link config
    TBI mode: disabled
    Link speed: 1000Mb/s
    Bus type: PCI
    Bus speed: 33MHz
    Bus width: 32-bit
    0x00100: RCTL (Receive control register) 0x00008002
    Receiver: enabled
    Store bad packets: disabled
    Unicast promiscuous: disabled
    Multicast promiscuous: disabled
    Long packet: disabled
    Descriptor minimum threshold size: 1/2
    Broadcast accept mode: accept
    VLAN filter: disabled
    Cononical form indicator: disabled
    Discard pause frames: filtered
    Pass MAC control frames: don't pass
    Receive buffer size: 2048
    0x02808: RDLEN (Receive desc length) 0x00001000
    0x02810: RDH (Receive desc head) 0x00000000
    0x02818: RDT (Receive desc tail) 0x000000FE
    0x02820: RDTR (Receive delay timer) 0x00000000
    0x00400: TCTL (Transmit ctrl register) 0x310000F8
    Transmitter: disabled
    Pad short packets: enabled
    Software XOFF Transmission: disabled
    Re-transmit on late collision: enabled
    0x03808: TDLEN (Transmit desc length) 0x00001000
    0x03810: TDH (Transmit desc head) 0x00000000
    0x03818: TDT (Transmit desc tail) 0x00000000
    0x03820: TIDV (Transmit delay timer) 0x00000008
    PHY type: M88
    Offset Values
    ------ ------
    0x0000 00 16 41 17 49 d2 30 0b b2 ff 51 00 ff ff ff ff
    0x0010 53 00 03 01 6b 02 01 20 aa 17 9a 10 86 80 df 80
    0x0020 00 00 00 20 54 7e 00 00 14 00 da 00 04 00 00 27
    0x0030 c9 6c 50 31 3e 07 0b 04 8b 29 00 00 00 f0 02 0f
    0x0040 08 10 00 00 04 0f ff 7f 01 4d ff ff ff ff ff ff
    0x0050 14 00 1d 00 14 00 1d 00 af aa 1e 00 00 00 1d 00
    0x0060 00 01 00 40 1f 12 07 40 ff ff ff ff ff ff ff ff
    0x0070 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ef 9f
    Ring parameters for eth0:
    Pre-set maximums:
    RX: 4096
    RX Mini: 0
    RX Jumbo: 0
    TX: 4096
    Current hardware settings:
    RX: 256
    RX Mini: 0
    RX Jumbo: 0
    TX: 256

    driver: e1000
    version: 7.3.20-k2-NAPI
    firmware-version: 0.5-1
    bus-info: 0000:02:00.0
    Offload parameters for eth0:
    rx-checksumming: on
    tx-checksumming: on
    scatter-gather: on
    tcp segmentation offload: on
    udp fragmentation offload: off
    generic segmentation offload: off
    NIC statistics:
    rx_packets: 0
    tx_packets: 591
    rx_bytes: 0
    tx_bytes: 58116
    rx_broadcast: 0
    tx_broadcast: 0
    rx_multicast: 0
    tx_multicast: 0
    rx_errors: 0
    tx_errors: 0
    tx_dropped: 0
    multicast: 0
    collisions: 0
    rx_length_errors: 0
    rx_over_errors: 0
    rx_crc_errors: 0
    rx_frame_errors: 0
    rx_no_buffer_count: 0
    rx_missed_errors: 0
    tx_aborted_errors: 0
    tx_carrier_errors: 0
    tx_fifo_errors: 0
    tx_heartbeat_errors: 0
    tx_window_errors: 0
    tx_abort_late_coll: 0
    tx_deferred_ok: 0
    tx_single_coll_ok: 0
    tx_multi_coll_ok: 0
    tx_timeout_count: 1
    tx_restart_queue: 0
    rx_long_length_errors: 0
    rx_short_length_errors: 0
    rx_align_errors: 0
    tx_tcp_seg_good: 0
    tx_tcp_seg_failed: 0
    rx_flow_control_xon: 0
    rx_flow_control_xoff: 0
    tx_flow_control_xon: 0
    tx_flow_control_xoff: 0
    rx_long_byte_count: 0
    rx_csum_offload_good: 0
    rx_csum_offload_errors: 0
    rx_header_split: 0
    alloc_rx_buff_failed: 0
    tx_smbus: 0
    rx_smbus: 0
    dropped_smbus: 0
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at

     \ /
      Last update: 2007-07-19 12:35    [W:0.030 / U:41.520 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site