RE: /proc/bus/pci

From: Linus Torvalds (
Date: Fri Jun 06 2003 - 19:35:00 EST

On Fri, 6 Jun 2003, Robert White wrote:
> So, my heard groans for another "domain" in the computer, and I like the way
> bridge reads

"bridge" means something completely different in PCI, it's a hub inside a
PCI domain, literally "bridging" two separate parts of the same domain
more-or-less seamlessly together.

A PCI domain, in contrast, is something that is _not_ bridged to another
PCI domain - two PCI domains are disjunct, and do not share any connection
(PCI-wise) to each other.

(Obviously there is some _non_PCI connection, since they are in the same
box, but that non-PCI connection might be the CPU, or it might be some
other switching fabric that is not itself visible in the PCI space).

This is why "domain" makes sense - at least to me "domain" is a
independent area as in "I am the master of my domain", correctly implying
that there may be other domains, but that they are separate.


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