Hi,
I don't know if this is well known or interesting. You can find
the processor locality of a network interface easily without
reading the hardware schematics. The linux kernel export it for you:
[ollie_at_boxtop1 device]$ cd /sys/class/net/ib0/
[ollie_at_boxtop1 ib0]$ ls
address create_child features link_mode statistics uevent
addr_len delete_child flags mtu subsystem weight
broadcast device ifindex operstate tx_queue_len
carrier dormant iflink pkey type
[ollie_at_boxtop1 ib0]$ cd device
[ollie_at_boxtop1 device]$ ls
broken_parity_status infiniband_mad:issm0 local_cpus resource0
bus infiniband_mad:issm1 modalias resource2
class infiniband_mad:umad0 net:ib0 subsystem
config infiniband_mad:umad1 net:ib1
subsystem_device
device infiniband:mthca0 pools
subsystem_vendor
driver infiniband_verbs:uverbs0 power uevent
enable irq resource vendor
[ollie_at_boxtop1 device]$ cat local_cpus
00000000,00000003
Ollie
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