On Thu, 27 Jul 2000, Allen K. Smith wrote:
> I have a three clusters of boxes, all identical hardware except the # of
> ethernet cards. Some have 1 (onboard eepro100), some have two, some have
> 3 (all eepro 100s). All I want is eth0 to be the same card on all three,
> eth1 to be the same on those that have it, and eth2 to be the 3rd.
> Consistency is all I'm asking for.
>
> I'm happy to place the second and third cards in the correct pci slot
> order so that they order correctly. I just need the main card (on the
> motherboard) to _always_ be eth0. It makes no sense to have it jump
> around as I add more NICs.
The OS has no way of knowing if a PCI device is on the motherboard, or is in
a physical slot.
Typically motherboards number the PCI devices so that a plugged-in device is
found and used in preference to the on-board device.
This is a characteristic of the specific motherboard, and is not specified
by any standard.
If this causes a problem for your application, select a motherboard that
numbers PCI devices differently. Again, this is a hardware attribute, not a
software attribute.
The Linux kernel provides a mechanism for finding the unique station address
for a network adapter. If your user-level code wants to implement a policy
of associating a network configuration with a specific network interface,
it is a simple matter of programming to save the configuration based on the
station address instead of the interface name.
________________
Read /proc/pci. You will find lines such as:
Bus 0, device 7, function 0:
This means that the device is on the PCI bus 0.
Bus 0 is the default top-level bus on a single-bus system.
It is at PCI index 7 on that bus.
You can think of as virtual slot 7. Each physical slot has a fixed device
index. The device index usually increases going away from the CPU.
Single function devices are always at function #0.
The function index is only used for PCI devices, such as the Symbios
SCSI+Ethernet, that have multiple independent functions per chip.
Donald Becker [EMAIL PROTECTED]
Scyld Computing Corporation http://www.scyld.com
410 Severn Ave. Suite 210 Beowulf Clusters / Linux Installations
Annapolis MD 21403
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