[Bug 265714] igc(4) drops link under high traffic

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=265714

--- Comment #67 from Kevin Bowling <[email protected]> ---
(In reply to Tomasz "CeDeROM" CEDRO from comment #66)
I'm suspicious of vbox here, rx q0 is stalled and there isn't any strong hw
lead left.  Does it happen without vbox?

/bin/sh <<'EOF'
read4()
{
    reg=$1
    name=$2
    idx=$((reg / 4))
    val=$(pciconf -D igc0 0x10 "$idx" 1 |
        hexdump -v -e '1/4 "%08x"')
    printf '%-5s [0x%04x] = 0x%s\n' "$name" "$reg" "$val"
}

read4 $((0x1514)) GPIE
read4 $((0x1524)) EIMS
read4 $((0x152c)) EIAC
read4 $((0x1530)) EIAM
EOF

upload these:
procstat -kk 0 > /tmp/igc-stall.kstack
procstat -t 0 > /tmp/igc-stall.threads
vmstat -i | grep igc
sleep 2
vmstat -i | grep igc

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