PCIe Root
Complex Connections (Dual-Processor Configurations)
This topic describes the PCIe root complex topology in servers
with two processor modules installed and operational.
This diagram illustrates the root complex connections between
the four CPUs and the 16 PCIe I/O slots. Each CPU supports two I/O
root complex fabrics. Each root complex connects to two I/O slots
through one of five multiplexing switches.
The port ID values shown in the diagram correspond to the
pci@ values reported in the showdevs command
output. For example:
|
|
|
|
|
0 |
0 |
0 |
1 |
/pci@300/pci@1/pci@0/pci@6 |
0 |
0 |
0 |
2 |
/pci@300/pci@1/pci@0/pci@c |
0 |
0 |
1 |
3 |
/pci@340/pci@1/pci@0/pci@6 |
0 |
0 |
1 |
4 |
/pci@340/pci@1/pci@0/pci@c |
1 |
2 |
1 |
5 |
/pci@400/pci@1/pci@0/pci@e |
1 |
2 |
1 |
6 |
/pci@400/pci@1/pci@0/pci@8 |
1 |
2 |
2 |
7 |
/pci@440/pci@1/pci@0/pci@e |
1 |
2 |
2 |
8 |
/pci@440/pci@1/pci@0/pci@8 |
0 |
1 |
2 |
9 |
/pci@380/pci@1/pci@0/pci@a |
0 |
1 |
2 |
10 |
/pci@380/pci@1/pci@0/pci@4 |
0 |
1 |
3 |
11 |
/pci@3c0/pci@1/pci@0/pci@e |
0 |
1 |
3 |
12 |
/pci@3c0/pci@1/pci@0/pci@8 |
1 |
3 |
3 |
13 |
/pci@480/pci@1/pci@0/pci@a |
1 |
3 |
3 |
14 |
/pci@480/pci@1/pci@0/pci@4 |
1 |
3 |
4 |
15 |
/pci@4c0/pci@1/pci@0/pci@8 |
1 |
3 |
4 |
16 |
/pci@4c0/pci@1/pci@0/pci@4 |
|
If you are reviewing root complex changes after adding a second
processor module, return to Server Upgrade Process.