fxp(4) and lockups on RELENG_6_x

[Krzysztof Kowalik]

Hello.

We are running an (IRC) server that under high-rate traffic (ie. DDoS
attack) stops to respond to the network. The network remains locked up
even after the original attack stops. However running tcpdump (which
switches the interface into promisc mode) unlocks networking and things
work again.

At the moment, we are running 6.2-RC1 cvsupped at Dec 10, with if_fxp.c
from Nov 11 (previously, we had 6.1 for a while, having the same issues)

if_fxp.c,v 1.240.2.10.2.1 2006/11/20 16:21:12

The same machine used to run FreeBSD 4.11 without any problems.

Any help/pointers/suggestions would be appreciated.

More hardware details:

fxp0 at pci2:3:0:  class=0x020000 card=0x10408086 chip=0x12298086 rev=0x0c
hdr=0x00
    vendor   = 'Intel Corporation'
    device   = '82550/1/7/8/9 EtherExpress PRO/100(B) Ethernet Adapter'
    class    = network
    subclass = ethernet

fxp0: <Intel 82550 Pro/100 Ethernet> port 0xc800-0xc83f mem
0xd9020000-0xd9020fff,0xd9000000-0xd901ffff irq 11 at device 3.0 on pci2
miibus0: <MII bus> on fxp0
fxp0: Ethernet address: 00:02:b3:90:65:86

interrupt                          total       rate
irq11: fxp0                        67322          0

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