Low bandwidth with DE500-BA in 100MbpsFD

[Darius Buntinas]

Hi,

I've searched the archives and found a couple of other messages from
people describing similar problems, but no one had a solution.  I'm hoping
that someone figured this out by now and can can give me some help.

We have a 16 machine cluster running Linux 2.0.36 SMP.  Half of these
machines have DE500-AA cards and the other half have newer DE500-BA cards.
We've noticed that the machines with the DE500-BA cards give only around
8Mbps throughput while the others give 80Mbps and up.  We put a DE500-AA
card into a machine that had a DE500-BA card and got the expected
throughput (80+Mbps).  

Here's the /var/log/messages stuff for the -BA card:
Aug 31 17:09:07 r10 kernel: tulip.c:v0.89H 5/23/98 becker@cesdis.gsfc.nasa.gov
Aug 31 17:09:07 r10 kernel: eth0: Digital DS21142/3 Tulip at 0xe880, 00 00 f8 1b 36 ba, IRQ 11.
Aug 31 17:09:07 r10 kernel: eth0:  EEPROM default media type Autosense.
Aug 31 17:09:07 r10 kernel: eth0:  Index #0 - Media 10baseT (#0) described by a 21142 Serial PHY (2) block.
Aug 31 17:09:07 r10 kernel: eth0:  Index #1 - Media 10baseT-FD (#4) described by a 21142 Serial PHY (2) block.
Aug 31 17:09:07 r10 kernel: eth0:  Index #2 - Media 100baseTx (#3) described by a 21143 SYM PHY (4) block.
Aug 31 17:09:07 r10 kernel: eth0:  Index #3 - Media 100baseTx-FD (#5) described by a 21143 SYM PHY (4) block.

Here's the same for the -AA card in the same machine:
Aug 31 16:31:27 m10 kernel: tulip.c:v0.89H 5/23/98 becker@cesdis.gsfc.nasa.gov
Aug 31 16:31:27 m10 kernel: eth0: Digital DS21140 Tulip at 0xe880, 00 00 f8 05 c2 23, IRQ 11.
Aug 31 16:31:27 m10 kernel: eth0:  EEPROM default media type Autosense.
Aug 31 16:31:27 m10 kernel: eth0:  Index #0 - Media MII (#11) described by a 211 40 MII PHY (1) block.
Aug 31 16:31:27 m10 kernel: eth0:  MII transceiver found at MDIO address 5, config 3100 status 782b.

We did not specify any options for the driver. Any help would be greatly
appreciated.

Thanks,
Darius