On Fri, Apr 27, 2012 at 08:17:48AM -0600, Bjorn Helgaas wrote: >I assume your question relates to the Stratus ftServer topology. If >so, the lspci details might clarify things. > >In that system, my understanding is that 03:01.0 is a downstream port, >not an upstream port. > >I think your picture is slightly misleading because PCIe links are not >buses; they're point-to-point links between two devices. You've drawn >#3 and #5 as buses that can have several devices on them, which is not >really the case. The link from a downstream port should lead to >exactly one device. Hmm... if this is a PCI bridge, then it will have both internal bus and externel bus? or no internal pci bus, just one external bus? > >That's one thing that's strange in the ftServer topology: apparently >there are *two* devices on bus 03: the 03:00.0 upstream port and the >03:01.0 downstream port. I think 03:00.0 is the upstream port of a >PCIe switch, which is perfectly normal. My understanding is that >03:01.0 is another *downstream* port that leads to several more >devices (USB, NIC, etc). > >Bjorn -- Richard Yang Help you, Help me -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
