[Bug 243463] ix0: Watchdog timeout

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=243463

            Bug ID: 243463
           Summary: ix0: Watchdog timeout
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: silence at cnw.cz

Hi all,
I observe some strange behavior of my NIC. Dual port Intel X520, only one port
connected.
Real traffic about 400MBit RX / 100MBit TX, Supermicro X11SCL-F/Xeon
E-2176G/2x8GB RAM, latest BIOS R1.2, acting as pf firewall/router. New install,
running first day. 

ix0: Watchdog timeout (TX: 0 desc avail: 34 pidx: 1455) -- resetting
ix0: link state changed to DOWN
ix0: link state changed to UP
ix0: Watchdog timeout (TX: 0 desc avail: 34 pidx: 1885) -- resetting
ix0: link state changed to DOWN
ix0: link state changed to UP
ix0: Watchdog timeout (TX: 0 desc avail: 34 pidx: 1062) -- resetting
ix0: link state changed to DOWN
ix0: link state changed to UP
ix0: Watchdog timeout (TX: 1 desc avail: 34 pidx: 177) -- resetting
ix0: link state changed to DOWN
ix0: link state changed to UP
ix0: Watchdog timeout (TX: 0 desc avail: 33 pidx: 1275) -- resetting
ix0: link state changed to DOWN
ix0: link state changed to UP
ix0: Watchdog timeout (TX: 0 desc avail: 34 pidx: 2014) -- resetting
ix0: link state changed to DOWN
ix0: link state changed to UP
ix0: Watchdog timeout (TX: 0 desc avail: 34 pidx: 707) -- resetting
ix0: link state changed to DOWN
ix0: link state changed to UP
ix0: Watchdog timeout (TX: 0 desc avail: 34 pidx: 653) -- resetting
ix0: link state changed to DOWN
ix0: link state changed to UP

ix0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> metric 0 mtu 1500      

options=8138b8<VLAN_MTU,VLAN_HWTAGGING,JUMBO_MTU,VLAN_HWCSUM,WOL_UCAST,WOL_MCAST,WOL_MAGIC,VLAN_HWFILTER>
        ether a0:36:9f:26:fb:b8
        inet x.x.x.x netmask 0xfffffff8 broadcast y.y.y.y
        media: Ethernet autoselect (10Gbase-LR <full-duplex,rxpause,txpause>)
        status: active
        nd6 options=29<PERFORMNUD,IFDISABLED,AUTO_LINKLOCAL>
        plugged: SFP/SFP+/SFP28 10G Base-LR (LC)
        vendor: Intel Corp PN: SFP-10G13-LR SN: IB81220374 DATE: 2018-12-20
        module temperature: 36.87 C Voltage: 3.28 Volts
        RX: 0.54 mW (-2.64 dBm) TX: 0.71 mW (-1.43 dBm)

ix0 at pci0:1:0:0: class=0x020000 card=0x7b118086 chip=0x154d8086 rev=0x01
hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Ethernet 10G 2P X520 Adapter'
    class      = network
    subclass   = ethernet

sysctl.conf
kern.ipc.maxsockbuf=16777216
net.inet.tcp.mssdflt=1460
net.inet.tcp.minmss=536

loader.conf
cc_htcp_load="YES"
machdep.hyperthreading_allowed="0"
net.inet.tcp.soreceive_stream="1"
net.isr.maxthreads="-1"
net.isr.bindthreads="-1"
net.pf.source_nodes_hashsize="1048576"

Jiri

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