Hello,

  I'm really new to Scientific Linux and I was trying 6.0 on a new 
server that should be a NFS box.

  I've a very strange problem with a e1g44etblk pci express card that I 
bought with the server: it is based on a intel 82576 chipset, the same 
of the integrated on board NICS.

  I've tested this card on a different box running ubuntu 10.04, and 
there it works perfectly, but if on this other box I install as well SL 
6.0, I have the same problem, that's why it seems to me a software issue 
with SL 6.0.

  I'll go more in the details below:

   Runnnig kernel version 2.6.32-71.18.2.el6.x86_64, when I test iperf 
on the integrated NIC, all is ok:

ethtool -i eth0
driver: igb
version: 2.1.0-k2
firmware-version: 1.2-3
bus-info: 0000:0d:00.0

And iperf gives 933 Mbit/sec or so.

  If I run iperf on the pci express nic,  ifconfig reports tons of 
errors, the card sort of hangs, and I must reboot to make the card work 
again:

before iperf:
ethtool -i eth4
driver: igb
version: 2.1.0-k2
firmware-version: 1.2-1
bus-info: 0000:06:00.0

After iperf:
ethtool -i eth4
driver: igb
version: 2.1.0-k2
firmware-version: 15.255-15
bus-info: 0000:06:00.0

and ethtool -e eth4 is:

Offset          Values
------          ------
0x0000          ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x0010          ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x0020          ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x0030          ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x0040          ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x0050          ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x0060          ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
0x0070          ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
bla
bla
bla

with ifconfig eth4
eth4      Link encap:Ethernet  HWaddr 00:1B:21:93:B5:2B
           BROADCAST MULTICAST  MTU:1500  Metric:1
           RX packets:921359 errors:57638461098900 
dropped:11527692219780 overruns:11527780147622 frame:46110768879120
           TX packets:232783 errors:23055384439560 dropped:0 overruns:0 
carrier:34583076659340
           collisions:11527692219780 txqueuelen:1000
           RX bytes:206382316 (196.8 MiB)  TX bytes:228814475 (218.2 MiB)
           Memory:f8be0000-f8c00000


I've tried as well with the intel driver (2.4.13), no joy.

This is my  /proc/cmdline
ro root=UUID=c7fee896-59c1-439d-9a6b-8df14a193de5 rd_NO_LUKS rd_NO_LVM 
rd_NO_MD rd_NO_DM LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 
KEYBOARDTYPE=pc KEYTABLE=us noapic acpi=off crashkernel=129M@0M rhgb quiet


Any suggestion? I can provide dmidecode of the two motherboards, but it 
seems to me more a kernel problem than other...

Regards

Raimondo