igb broken? Unexplained weirdness with intel 82576 nics on a supermicro board.

I have 3 boxes, each with two nics. One nic for the private network and 
one for the public network.
The private network is all on the same vlan. All 6 nics are on the same 
switch. All connections are 1000tx Full Duplex.

I will call the servers Box A, Box B, and Box C.

When i FTP data between Box A & B i get abou 25MB/sec.
When i FTP data from Box C to Box A or B, i get about 20MB/sec.
When i FTP data from Box A to C i get 10MB/sec
When i FTP data from Box B to C i get 200KB/sec...

Can anyone suggest why i might only be getting 200KB when transfering 
data from Box B to C but not when transferring data from Box A to C?

I tried installing ubuntu to see if the problem was still there and it 
is not. I can FTP data from Box A or B to box C at 10MB/sec, still not 
the gigabit speeds i should be seeing but not the 200KB/sec  i am 
getting with freebsd.

I logged into my switch and it reports that the ports are 1000tx full 
duplex, the same as what freebsd is reporting. The switch & freebsd also 
report no errors.

I really dont know what to do. Nothing anywhere reports showing a 
problem but obviously there is a problem somewhere. I've tried drivers 
1.9.5, 1.8.4, and 1.7.3. If i use 1.8.4 or 1.7.3 i get 50KB/sec 
transferring data from box B whereas if i use 1.9.5 i get 200-300KB sec. 
I should be getting like 50MB/sec ;(

Any help would be grateful. Or, maybe someone could put me in touch with 
the person responsible for the intel nic drivers and i can work with 
them on resolving this issue?

Thanks in advance.


Name    Mtu Network       Address              Ipkts Ierrs Idrop    
Opkts Oerrs  Coll
igb0   1500 <Link#1>      00:30:48:9f:11:04    25853     0     0    
18340     0     0
igb0   1500 216.105.91.14 216.105.91.145       19040     -     -    
18343     -     -
igb1*  1500 <Link#2>      00:30:48:9f:11:05        0     0     0        
0     0     0
lo0   16384 <Link#3>                              72     0     0       
72     0     0
lo0   16384 127.0.0.0/8   127.0.0.1               72     -     -       
72     -     -

Sysctl info for igb0/1
dev.igb.0.%desc: Intel(R) PRO/1000 Network Connection version - 1.8.4
dev.igb.0.%driver: igb
dev.igb.0.%location: slot=0 function=0
dev.igb.0.%pnpinfo: vendor=0x8086 device=0x10c9 subvendor=0x15d9 
subdevice=0x0100 class=0x020000
dev.igb.0.%parent: pci1
dev.igb.0.debug: -1
dev.igb.0.stats: -1
dev.igb.0.flow_control: 3
dev.igb.0.enable_aim: 1
dev.igb.0.low_latency: 128
dev.igb.0.ave_latency: 450
dev.igb.0.bulk_latency: 1200
dev.igb.0.rx_processing_limit: 100

Debug info for igb0
May  8 09:17:57 debbie kernel: igb0: TX(1) Packets sent = 1295
May  8 09:17:57 debbie kernel: igb0: Queue(2) tdh = 106, tdt = 106
May  8 09:17:57 debbie kernel: igb0: TX(2) no descriptors avail event = 0
May  8 09:17:57 debbie kernel: igb0: TX(2) MSIX IRQ Handled = 5353
May  8 09:17:57 debbie kernel: igb0: TX(2) Packets sent = 5450
May  8 09:17:57 debbie kernel: igb0: Queue(3) tdh = 1687, tdt = 1687
May  8 09:17:57 debbie kernel: igb0: TX(3) no descriptors avail event = 0
May  8 09:17:57 debbie kernel: igb0: TX(3) MSIX IRQ Handled = 1335
May  8 09:17:57 debbie kernel: igb0: TX(3) Packets sent = 1354
May  8 09:17:57 debbie kernel: igb0: Queue(0) rdh = 425, rdt = 424
May  8 09:17:57 debbie kernel: igb0: RX(0) Packets received = 16809
May  8 09:17:57 debbie kernel: igb0: RX(0) Split Packets = 12262
May  8 09:17:57 debbie kernel: igb0: RX(0) Byte count = 25894129
May  8 09:17:57 debbie kernel: igb0: RX(0) MSIX IRQ Handled = 43428
May  8 09:17:57 debbie kernel: igb0: RX(0) LRO Queued= 13601
May  8 09:17:57 debbie kernel: igb0: RX(0) LRO Flushed= 9966
May  8 09:17:57 debbie kernel: igb0: Queue(1) rdh = 1700, rdt = 1699
May  8 09:17:57 debbie kernel: igb0: RX(1) Packets received = 1700
May  8 09:17:57 debbie kernel: igb0: RX(1) Split Packets = 937
May  8 09:17:57 debbie kernel: igb0: RX(1) Byte count = 1392691
May  8 09:17:57 debbie kernel: igb0: RX(1) MSIX IRQ Handled = 31888
May  8 09:17:57 debbie kernel: igb0: RX(1) LRO Queued= 1362
May  8 09:17:57 debbie kernel: igb0: RX(1) LRO Flushed= 1351
May  8 09:17:57 debbie kernel: igb0: Queue(2) rdh = 33, rdt = 32
May  8 09:17:57 debbie kernel: igb0: RX(2) Packets received = 6177
May  8 09:17:57 debbie kernel: igb0: RX(2) Split Packets = 1442
May  8 09:17:57 debbie kernel: igb0: RX(2) Byte count = 2518498
May  8 09:17:57 debbie kernel: igb0: RX(2) MSIX IRQ Handled = 36258
May  8 09:17:57 debbie kernel: igb0: RX(2) LRO Queued= 5794
May  8 09:17:57 debbie kernel: igb0: RX(2) LRO Flushed= 5673
May  8 09:17:57 debbie kernel: igb0: Queue(3) rdh = 1418, rdt = 1417
May  8 09:17:57 debbie kernel: igb0: RX(3) Packets received = 1418
May  8 09:17:57 debbie kernel: igb0: RX(3) Split Packets = 939
May  8 09:17:57 debbie kernel: igb0: RX(3) Byte count = 1700710
May  8 09:17:57 debbie kernel: igb0: RX(3) MSIX IRQ Handled = 31399
May  8 09:17:57 debbie kernel: igb0: RX(3) LRO Queued= 1102
May  8 09:17:57 debbie kernel: igb0: RX(3) LRO Flushed= 882
May  8 09:17:57 debbie kernel: igb0: LINK MSIX IRQ Handled = 2
May  8 09:17:57 debbie kernel: igb0: Mbuf defrag failed = 0
May  8 09:17:57 debbie kernel: igb0: Std mbuf header failed = 0
May  8 09:17:57 debbie kernel: igb0: Std mbuf packet failed = 0
May  8 09:17:57 debbie kernel: igb0: Driver dropped packets = 0
May  8 09:17:57 debbie kernel: igb0: Driver tx dma failure in xmit = 0


sysctl status info:
May  8 09:19:08 debbie kernel: igb0: Excessive collisions = 0
May  8 09:19:08 debbie kernel: igb0: Sequence errors = 0
May  8 09:19:08 debbie kernel: igb0: Defer count = 0
May  8 09:19:08 debbie kernel: igb0: Missed Packets = 0
May  8 09:19:08 debbie kernel: igb0: Receive No Buffers = 0
May  8 09:19:08 debbie kernel: igb0: Receive Length Errors = 0
May  8 09:19:08 debbie kernel: igb0: Receive errors = 0
May  8 09:19:08 debbie kernel: igb0: Crc errors = 0
May  8 09:19:08 debbie kernel: igb0: Alignment errors = 0
May  8 09:19:08 debbie kernel: igb0: Collision/Carrier extension errors = 0
May  8 09:19:08 debbie kernel: igb0: RX overruns = 0
May  8 09:19:08 debbie kernel: igb0: watchdog timeouts = 0
May  8 09:19:08 debbie kernel: igb0: XON Rcvd = 17
May  8 09:19:08 debbie kernel: igb0: XON Xmtd = 0
May  8 09:19:08 debbie kernel: igb0: XOFF Rcvd = 17
May  8 09:19:08 debbie kernel: igb0: XOFF Xmtd = 0
May  8 09:19:08 debbie kernel: igb0: Good Packets Rcvd = 26159
May  8 09:19:08 debbie kernel: igb0: Good Packets Xmtd = 21564
May  8 09:19:08 debbie kernel: igb0: TSO Contexts Xmtd = 1687
May  8 09:19:08 debbie kernel: igb0: TSO Contexts Failed = 0