Rahul wrote:
> I found this quote in the newsgroup while I was reading up on ethernet
> bonding:
>
> "Most of the servers I am familar with two ethernet ports are designed
> to have one used as a backup, as they are both connected to the same
> bus. None of them had sufficent bus bandwith to actually drive two
> gigabit ethernets anywhere near full capacity. Indeed, depending on
> what else was on the bus the performance may be less than one gigabit
> interface. " (Frank Stutzman )
>
> What's the way to check if my twin NICs are on the same / different busses?
>
You might run

lspci -v

as root. Here is mine for my 3 NIC's.

03:02.0 Ethernet controller: Intel Corporation 82546EB Gigabit Ethernet
Controller (Copper) (rev 01)
Subsystem: Intel Corporation PRO/1000 MT Dual Port Server Adapter
Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 50
Memory at fc200000 (64-bit, non-prefetchable) [size=128K]
I/O ports at 3000 [size=64]
Capabilities: [dc] Power Management version 2
Capabilities: [e4] PCI-X non-bridge device
Capabilities: [f0] Message Signalled Interrupts: 64bit+ Queue=0/0
Enable-

03:02.1 Ethernet controller: Intel Corporation 82546EB Gigabit Ethernet
Controller (Copper) (rev 01)
Subsystem: Intel Corporation PRO/1000 MT Dual Port Server Adapter
Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 58
Memory at fc220000 (64-bit, non-prefetchable) [size=128K]
I/O ports at 3040 [size=64]
Capabilities: [dc] Power Management version 2
Capabilities: [e4] PCI-X non-bridge device
Capabilities: [f0] Message Signalled Interrupts: 64bit+ Queue=0/0
Enable-

05:01.0 Ethernet controller: Intel Corporation 82557/8/9/0/1 Ethernet Pro
100 (rev 08)
Subsystem: Intel Corporation EtherExpress PRO/100+ Management Adapter
Flags: bus master, medium devsel, latency 66, IRQ 66
Memory at fc400000 (32-bit, non-prefetchable) [size=4K]
I/O ports at 4000 [size=64]
Memory at fc500000 (32-bit, non-prefetchable) [size=1M]
[virtual] Expansion ROM at f8800000 [disabled] [size=1M]
Capabilities: [dc] Power Management version 2

The first two are on PCI-X bus 03 (a two-channel chip) and the last one is
on PCI-X bus 05 (a single card with only one network interface).

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