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    SubjectRe: WARNING: at net/sched/sch_generic.c:219 dev_watchdog+0xfe/0x17e() with tg3 network
    Hi Matt,

    On Thu, Nov 20, 2008 at 01:53:18PM -0800, Matt Carlson wrote:
    > > Today, with the notebook connected to a gig switch, I could not reproduce
    > > the problem, even after one hour of approximately the same workload. I'll
    > > retry with the original 100 Mbps switch on monday.

    fairly easier now with the same switch. I just have to transfer 100k objects
    over HTTP via this switch to see the problem happen :

    tg3: eth0: The system may be re-ordering memory-mapped I/O cycles to the network device, attempting to recover. Please report the problem to the driver maintainer and include system chipset information.
    tg3: tg3_stop_block timed out, ofs=1400 enable_bit=2
    tg3: tg3_stop_block timed out, ofs=c00 enable_bit=2
    tg3: eth0: Link is down.
    tg3: eth0: Link is up at 100 Mbps, full duplex.
    tg3: eth0: Flow control is on for TX and on for RX.

    The switch is an el-cheapo D-Link 10/100. Note that this time I did not see
    any warning. Maybe I did not wait long enough though. Here are some stats
    and information I could collect :

    root@wtap:/# ethtool -i eth0
    driver: tg3
    version: 3.94
    firmware-version: 5705-v3.14
    bus-info: 0000:02:0e.0

    root@wtap:/# ethtool eth0
    Settings for eth0:
    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: 100Mb/s
    Duplex: Full
    Port: Twisted Pair
    PHYAD: 1
    Transceiver: internal
    Auto-negotiation: on
    Supports Wake-on: g
    Wake-on: d
    Current message level: 0x000000ff (255)
    Link detected: yes

    root@wtap:/# ethtool -k eth0
    Offload parameters for eth0:
    rx-checksumming: on
    tx-checksumming: on
    scatter-gather: on
    tcp segmentation offload: off

    root@wtap:/# ethtool -a eth0
    Pause parameters for eth0:
    Autonegotiate: on
    RX: on
    TX: on

    root@wtap:/# netstat -ni
    Kernel Interface table
    Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg
    eth0 1500 0 61665 0 0 0 65133 0 0 0 BMRU
    lo 16436 0 945938 0 0 0 945938 0 0 0 LRU

    root@wtap:/# ethtool -S eth0
    NIC statistics:
    rx_octets: 52461785
    rx_fragments: 0
    rx_ucast_packets: 61018
    rx_mcast_packets: 0
    rx_bcast_packets: 476
    rx_fcs_errors: 0
    rx_align_errors: 0
    rx_xon_pause_rcvd: 0
    rx_xoff_pause_rcvd: 0
    rx_mac_ctrl_rcvd: 0
    rx_xoff_entered: 0
    rx_frame_too_long_errors: 0
    rx_jabbers: 0
    rx_undersize_packets: 0
    rx_in_length_errors: 0
    rx_out_length_errors: 0
    rx_64_or_less_octet_packets: 0
    rx_65_to_127_octet_packets: 0
    rx_128_to_255_octet_packets: 0
    rx_256_to_511_octet_packets: 0
    rx_512_to_1023_octet_packets: 0
    rx_1024_to_1522_octet_packets: 0
    rx_1523_to_2047_octet_packets: 0
    rx_2048_to_4095_octet_packets: 0
    rx_4096_to_8191_octet_packets: 0
    rx_8192_to_9022_octet_packets: 0
    tx_octets: 54658258
    tx_collisions: 0
    tx_xon_sent: 0
    tx_xoff_sent: 0
    tx_flow_control: 0
    tx_mac_errors: 0
    tx_single_collisions: 0
    tx_mult_collisions: 0
    tx_deferred: 0
    tx_excessive_collisions: 0
    tx_late_collisions: 0
    tx_collide_2times: 0
    tx_collide_3times: 0
    tx_collide_4times: 0
    tx_collide_5times: 0
    tx_collide_6times: 0
    tx_collide_7times: 0
    tx_collide_8times: 0
    tx_collide_9times: 0
    tx_collide_10times: 0
    tx_collide_11times: 0
    tx_collide_12times: 0
    tx_collide_13times: 0
    tx_collide_14times: 0
    tx_collide_15times: 0
    tx_ucast_packets: 65033
    tx_mcast_packets: 0
    tx_bcast_packets: 0
    tx_carrier_sense_errors: 0
    tx_discards: 0
    tx_errors: 0
    dma_writeq_full: 0
    dma_write_prioq_full: 0
    rxbds_empty: 0
    rx_discards: 0
    rx_errors: 0
    rx_threshold_hit: 0
    dma_readq_full: 0
    dma_read_prioq_full: 0
    tx_comp_queue_full: 0
    ring_set_send_prod_index: 0
    ring_status_update: 0
    nic_irqs: 0
    nic_avoided_irqs: 0
    nic_tx_threshold_hit: 0

    I will try to go back to older kernels then bisect tg3 changes. I
    cannot do this right now since I'm using my laptop for work ;-)

    Regards,
    Willy



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