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

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

--- Comment #66 from Tomasz "CeDeROM" CEDRO <[email protected]> ---
That sysctl dump was from within the stall, interface was up but the
connectivity failed, had to restart network by hand to get it running again
(service netif stop; /etc/netstart).

Stuff below is after igc0 restart, got back up, but then I switched to ix0 and
put igc0 down, no reboot so maybe something interesting is still here. I am
working on ix0 right now. igc is extremely unreliable here and always craps
itself in the middle or work.. how this is frustrating on your own local
desktop now imagine you loose network on a remote machine.

#
# PCICONF
#

igc0@pci0:132:0:0:      class=0x020000 rev=0x04 hdr=0x00 vendor=0x8086
device=0x125c subvendor=0x8086 subdevice=0x0000
    cap 01[40] = powerspec 3  supports D0 D3  current D0
    cap 05[50] = MSI supports 1 message, 64 bit, vector masks
    cap 11[70] = MSI-X supports 5 messages, enabled
                 Table in map 0x1c[0x0], PBA in map 0x1c[0x2000]
    cap 10[a0] = PCI-Express 2 endpoint max data 256(512) FLR RO NS
                 max read 512
                 link x1(x1) speed 5.0(5.0) ASPM L1(L1)
    ecap 0001[100] = AER 2 0 fatal 1 non-fatal 1 corrected
    ecap 0003[140] = Serial 1 [XXX]
    ecap 0018[1c0] = LTR 1
    ecap 001f[1f0] = Precision Time Measurement 1
    ecap 001e[1e0] = L1 PM Substates 1

#
# VMSTAT
#

irq151: igc0:rxq0                1075529         61
irq152: igc0:rxq1                1905162        108
irq153: igc0:rxq2                 683268         39
irq154: igc0:rxq3                 630179         36
irq155: igc0:aq                        6          0

#
# NETSTAT
#

Name    Mtu Network   Address              Ipkts Ierrs Idrop       Ibytes   
Opkts Oerrs       Obytes  Coll  Drop
igc0   1500 <Link#1>  [XXX]  8503350   322     0  11337485568  2336649     0   
292561991     0     0

#
# FIX CHECK
#

L1PM capability offset: 0x1e0
L1PM CTL1 offset:      0x1e8
L1PM CTL1 value:       0x408c001b
I226 ASPM L1.2 enable: CLEAR (workaround active)

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