On Fri, 2009-06-12 at 14:51 -0700, Jean-Louis Dupond wrote:

Hello!

Here is a mii-tool -vvv on a box that doesn't advertise gbit speeds! It 
just doesn't advertise gbit @ random, sometimes it does, sometimes not! 
Without any logic in it!

# mii-tool  -vvv
Using SIOCGMIIPHY=0x8947
eth0: link ok
    registers for MII PHY 1:
      1000 794d 0143 bed0 05e1 0000 0064 2001
      0000 0300 0000 0000 0000 0000 0000 3000

Register 1 shows that autoneg did not complete (bit 5 is not set).
The tg3 device has advertised 10/100/1000 in register 4 and register 9,
but registers 5 and 0xa (link partner's advertisement registers are 0).

When it works, these registers should look very different.

Have you tried other cables?  What is the link partner?

      0000 0101 0000 0000 0000 0000 0000 0000
      7477 0104 0000 ffff 2801 0000 8000 0000
    product info: vendor 00:50:ef, model 45 rev 0
    basic mode:   autonegotiation enabled
    basic status: link ok
    capabilities: 1000baseT-HD 1000baseT-FD 100baseTx-FD 100baseTx-HD
10baseT-FD 10baseT-HD
    advertising:  100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-
control

# dmesg | grep tg3
[    3.331702] tg3.c:v3.92.1 (June 9, 2008)
[   18.238654] tg3: eth0: Link is up at 10 Mbps, half duplex.
[   18.238654] tg3: eth0: Flow control is off for TX and off for RX.