Are there known issues with multicast on Intel Pro 1000?

[gnn at freebsd.org]

Howdy,

At my current gig we find that the network interface locks up if we
subject it to a high rate of multicast traffic.  Since the whole
purpose of this box is to do multicast (it absorbs a feed of data over
multicast manipulates and then sends it out again over multicast) it's
a "bad thing" if this kind of thing does not work.

What I currently know is not complete but I figured I could start
here.

The symptom is that all network communication stops, but the system
itself is still responsive, so I can get to the console and get
information.

Release: 6.2 and 6.3-PRERELEASE (6.3 as of Wed Jan 16th)

`Motherboard:

CPU: 2 x Intel Xeon X5365 3GHz (4 cores each)

Memory: 8G

em0: Intel PRO/1000 6.7.3 port 0x2000-0x201f mem 0xd8320000-0xd833ffff
em1: Intel PRO/1000 6.7.3 port 0x2020-0x203f mem 0xd8320000-0xd833ffff
em2: Intel PRO/1000 6.7.3 port 0x3000-0x303f mem 0xd8240000-0xd825ffff, 0xd8200000-0xd823ffff
em3: Intel PRO/1000 6.7.3 port 0x3040-0x307f mem 0xd8260000-0xd827ffff

Other data:

em2 is the interface that multicasts out our digested data and it also
is receiving a lot of digested multicast traffic, which is being
recorded by a proprietary program

sysctl dev.em.2.debug=1
em2: CTRL = 0x487c0a01 RCTL=0x8002
em2: Pcket buffer = Tx=16k Rx=48k
em2: fifo workaround = 0, fifo_reset_count = 0
em2: hw tdh = 76, hw tdt = 76
em2: hw rdh = 213, hw rdt = 212
em2: Num Tx descriptors avail = 256
em2: Tx Descriptors not avail1 = 0
em2: Tx Descriptors not avail2 = 0
em2: Std mbuf failed = 0
em2: Std mbuf cluster fialed = 1247383 (this number is increasing by about 1 a
second)
em2: Driver dropped packets = 0
em2: Driver tx dma failure in encap = 0
sysctl dev.em.2.stats=1
(all are zero except what is recorded)
em2: Missed Packets = 4683
em2: Receive No Buffers = 46905
em2: RX overruns = 83
em2: Good Packets Rcvd = 11416687
em2: Good Packets Xmtd = 146576

em0 is the interface we receive the raw data over multicast on

em0: hw tdh = 130, hw tdt = 130
em0: hw rdh = 13, hw rdt = 12
em0: Num Tx descriptors avail = 256
em0: Std mbuf cluster failed = 5111461 (this number is going up by about 1 a
second)
sysctl dev.em.0.stats=1
(all are zero except what is recorded)
em0: Missed Packets = 292778
em0: Receive No Buffers = 96211
em0: RX overruns = 1092
em0: Good Packets Rcvd = 5386001
em0: Good Packets Xmtd = 12418

em3 receives a little data from multicast and it is recorded using
a proprietary program

em3: hw tdh = 45, hw tdt = 45
em3: hw rdh = 216, hw rdt = 215
em3: Num Tx descriptors avail = 256
em3: Std mbuf cluster failed = 195951 (also going up by 1 very slowly)

sysctl dev.em.3.stats=1
(all are zero except what is recorded)
em3: Good Packets Rcvd = 9637851
em3: Good Packets Xmtd = 8237



One odd thing is that when the system boots, em1, which is unused in
this case complains of:

em1: Using MSI interrupt
em1: Setup of Shared code failed



What more do people need to help debug this?  

Best,
George