RELENG_7 em problems (and RELENG_8)

[Mike Tancsa]

At 06:36 PM 9/24/2010, Jack Vogel wrote:
>There is a new revision of the em driver coming next week, its going thru some
>stress pounding over the weekend, if no issues show up I'll put it into HEAD.
>
>Yongari's changes in TX context handling which effects checksum and tso
>are added. I've also decided that multiple queues in 82574 just are a source
>of problems without a lot of benefit, so it still uses MSIX but with 
>only 3 vectors,
>meaning it seperates TX and RX but has a single queue.

Thanks, looking forward to trying it out!  With respect to the 
multiple queues, I thought the driver already used just the one on 
RELENG_8 ?  If not, is there a way to force the existing driver to 
use just the one queue ?

On the box that has the NIC locking up, it shows

em1 at pci0:9:0:0: class=0x020000 card=0x34ec8086 chip=0x10d38086 
rev=0x00 hdr=0x00
     vendor     = 'Intel Corporation'
     device     = 'Intel 82574L Gigabit Ethernet Controller (82574L)'
     class      = network
     subclass   = ethernet
     cap 01[c8] = powerspec 2  supports D0 D3  current D0
     cap 05[d0] = MSI supports 1 message, 64 bit enabled with 1 message
     cap 10[e0] = PCI-Express 1 endpoint max data 128(256) link x1(x1)

and

vmstat -i shows

irq256: em0                      5129063        353
irq257: em1                       531251         36

in a wedged state, stats look like

dev.em.1.%desc: Intel(R) PRO/1000 Network Connection 7.0.5
dev.em.1.%driver: em
dev.em.1.%location: slot=0 function=0 handle=\_SB_.PCI0.PEX4.HART
dev.em.1.%pnpinfo: vendor=0x8086 device=0x10d3 subvendor=0x8086 
subdevice=0x34ec class=0x020000
dev.em.1.%parent: pci9
dev.em.1.nvm: -1
dev.em.1.rx_int_delay: 0
dev.em.1.tx_int_delay: 66
dev.em.1.rx_abs_int_delay: 66
dev.em.1.tx_abs_int_delay: 66
dev.em.1.rx_processing_limit: 100
dev.em.1.link_irq: 0
dev.em.1.mbuf_alloc_fail: 0
dev.em.1.cluster_alloc_fail: 0
dev.em.1.dropped: 0
dev.em.1.tx_dma_fail: 0
dev.em.1.fc_high_water: 18432
dev.em.1.fc_low_water: 16932
dev.em.1.mac_stats.excess_coll: 0
dev.em.1.mac_stats.symbol_errors: 0
dev.em.1.mac_stats.sequence_errors: 0
dev.em.1.mac_stats.defer_count: 0
dev.em.1.mac_stats.missed_packets: 41522
dev.em.1.mac_stats.recv_no_buff: 19
dev.em.1.mac_stats.recv_errs: 0
dev.em.1.mac_stats.crc_errs: 0
dev.em.1.mac_stats.alignment_errs: 0
dev.em.1.mac_stats.coll_ext_errs: 0
dev.em.1.mac_stats.rx_overruns: 41398
dev.em.1.mac_stats.watchdog_timeouts: 0
dev.em.1.mac_stats.xon_recvd: 0
dev.em.1.mac_stats.xon_txd: 0
dev.em.1.mac_stats.xoff_recvd: 0
dev.em.1.mac_stats.xoff_txd: 0
dev.em.1.mac_stats.total_pkts_recvd: 95229129
dev.em.1.mac_stats.good_pkts_recvd: 95187607
dev.em.1.mac_stats.bcast_pkts_recvd: 79244
dev.em.1.mac_stats.mcast_pkts_recvd: 0
dev.em.1.mac_stats.rx_frames_64: 93680
dev.em.1.mac_stats.rx_frames_65_127: 1516349
dev.em.1.mac_stats.rx_frames_128_255: 4464941
dev.em.1.mac_stats.rx_frames_256_511: 4024
dev.em.1.mac_stats.rx_frames_512_1023: 2096067
dev.em.1.mac_stats.rx_frames_1024_1522: 87012546
dev.em.1.mac_stats.good_octets_recvd: 0
dev.em.1.mac_stats.good_octest_txd: 0
dev.em.1.mac_stats.total_pkts_txd: 66775098
dev.em.1.mac_stats.good_pkts_txd: 66775098
dev.em.1.mac_stats.bcast_pkts_txd: 509
dev.em.1.mac_stats.mcast_pkts_txd: 7
dev.em.1.mac_stats.tx_frames_64: 48038472
dev.em.1.mac_stats.tx_frames_65_127: 13402833
dev.em.1.mac_stats.tx_frames_128_255: 5324413
dev.em.1.mac_stats.tx_frames_256_511: 957
dev.em.1.mac_stats.tx_frames_512_1023: 319
dev.em.1.mac_stats.tx_frames_1024_1522: 8104
dev.em.1.mac_stats.tso_txd: 1069
dev.em.1.mac_stats.tso_ctx_fail: 0
dev.em.1.interrupts.asserts: 0
dev.em.1.interrupts.rx_pkt_timer: 0
dev.em.1.interrupts.rx_abs_timer: 0
dev.em.1.interrupts.tx_pkt_timer: 0
dev.em.1.interrupts.tx_abs_timer: 0
dev.em.1.interrupts.tx_queue_empty: 0
dev.em.1.interrupts.tx_queue_min_thresh: 0
dev.em.1.interrupts.rx_desc_min_thresh: 0
dev.em.1.interrupts.rx_overrun: 0
dev.em.1.host.breaker_tx_pkt: 0
dev.em.1.host.host_tx_pkt_discard: 0
dev.em.1.host.rx_pkt: 0
dev.em.1.host.breaker_rx_pkts: 0
dev.em.1.host.breaker_rx_pkt_drop: 0
dev.em.1.host.tx_good_pkt: 0
dev.em.1.host.breaker_tx_pkt_drop: 0
dev.em.1.host.rx_good_bytes: 0
dev.em.1.host.tx_good_bytes: 0
dev.em.1.host.length_errors: 0
dev.em.1.host.serdes_violation_pkt: 0
dev.em.1.host.header_redir_missed: 0

ifconfig down/up just panics or locks up the box when its in this 
state.  I also have IPMI enabled on this nic, but it shows the same 
issue with it disabled.

         ---Mike


--------------------------------------------------------------------
Mike Tancsa,                                      tel +1 519 651 3400
Sentex Communications,                            mike at sentex.net
Providing Internet since 1994                    www.sentex.net
Cambridge, Ontario Canada                         www.sentex.net/mike