On 09/19/2010 01:18 AM, Gilboa Davara wrote:
On Sat, 2010-09-18 at 21:08 -0400, Genes MailLists wrote:
>
>
> The machine has 3 intel nic's -
>
> lspci | egrep -i ethernet
> 04:00.0 Ethernet controller: Intel Corporation 82573L Gigabit Ethernet
> Controller (rev 01)
> 05:04.0 Ethernet controller: Intel Corporation 82541PI Gigabit Ethernet
> Controller (rev 05)
> 05:05.0 Ethernet controller: Intel Corporation 82541PI Gigabit Ethernet
> Controller (rev 05)
>
..
> Both nic's come up in 100 Mb/s - I rebooted the switch, and
I plugged
> and unplugged the cables, I tried ethtool -r ethx a few times to no avail.
>
> Other machines on same switch are happily running at full gigabit speeds.
>
> Nothing in logs suggests a problem
>
> Is there a problem with multi nics of same brand where they need to run
> at diff speeds ? Or is this a quirk with some hardware somewhere ? Or ???
>
>
Unlikely.
We use Intel NIC's (both 1GbE and 10GbE) extensively (up to 16 linkes
per machine) for link monitoring without issues.
I have confirmed that when the 2 intel 8254 NIC's are in play - they
both run at 100 - when i switch out one of the and instead use one 8254
and the other 8257 (also intel) then indeed the one connected to the Gb
switch runs at 1 Gb and the other remains at 100.
So this conforms a bug - there is a problem with 2 identical NICs both
running at 100 instead of 1 at a Gb (for hardware described above anyway)
Now this is an older kernel (2.6.27) so it may have been fixed since
then - anyone know ?
gene/