I/O Root
Complex Connections
On the 2-processor server, each CPU connects to four of the
PCIe slots. Each PCIe slot also uses a specific I/O subsystem (IOS0
or IOS1) and PCIe Switch (0 or 1)
CPU0, IOS1, and PCIe
Switch 0 connect to slot 1.
CPU0, IOS0, and PCIe Switch 1 connect to slots 5,
6, and 7.
CPU1, IOS1, and PCIe Switch 0 connect to slots 2,
3, and 4.
CPU1, IOS0, and PCIe Switch 1 connect to slot 8.
On the 1-processor server, the single CPU connects to all
eight of the PCIe slots. Each PCIe slot uses a specific I/O subsystem
(IOS0 or IOS1) and PCIe Switch (0 or 1)
CPU0, IOS1, and PCIe
Switch 0 connect to slot 1, 2, 3, and 4.
CPU0, IOS0, and PCIe Switch 1 connect to slots 5,
6, 7, and 8.
Note - For diagrams showing connections between PCIe slots
and root complexes for the 2-processor and 1-processor servers,
see
System Schematic.
The pci@ values reported in the OpenBoot show-devs command
output are paths in the I/O root complex topology. The values are
different for the 2-processor and 1-processor servers.
2-processor server root complex
paths:
|
|
|
|
|
|
1 |
0 |
1 |
0 |
/pci@300/pci@1/pci@0/pci@4 |
/SYS/MB/PCIE1 |
2 |
1 |
1 |
0 |
/pci@380/pci@1/pci@0/pci@5 |
/SYS/MB/PCIE2 |
3 |
1 |
1 |
0 |
/pci@380/pci@1/pci@0/pci@6 |
/SYS/MB/PCIE3 |
4 |
1 |
1 |
0 |
/pci@380/pci@1/pci@0/pci@7 |
/SYS/MB/PCIE4 |
5 |
0 |
0 |
1 |
/pci@340/pci@1/pci@0/pci@4 |
/SYS/MB/PCIE5 |
6 |
0 |
0 |
1 |
/pci@340/pci@1/pci@0/pci@5 |
/SYS/MB/PCIE6 |
7 |
0 |
0 |
1 |
/pci@340/pci@1/pci@0/pci@6 |
/SYS/MB/PCIE7 |
8 |
1 |
0 |
1 |
/pci@3c0/pci@1/pci@0/pci@7 |
/SYS/MB/PCIE8 |
|
1-processor server root complex
paths:
|
|
|
|
|
|
1 |
0 |
1 |
0 |
/pci@300/pci@1/pci@0/pci@4 |
/SYS/MB/PCIE1 |
2 |
0 |
1 |
0 |
/pci@300/pci@1/pci@0/pci@5 |
/SYS/MB/PCIE2 |
3 |
0 |
1 |
0 |
/pci@300/pci@1/pci@0/pci@6 |
/SYS/MB/PCIE3 |
4 |
0 |
1 |
0 |
/pci@300/pci@1/pci@0/pci@7 |
/SYS/MB/PCIE4 |
5 |
0 |
0 |
1 |
/pci@340/pci@1/pci@0/pci@4 |
/SYS/MB/PCIE5 |
6 |
0 |
0 |
1 |
/pci@340/pci@1/pci@0/pci@5 |
/SYS/MB/PCIE6 |
7 |
0 |
0 |
1 |
/pci@340/pci@1/pci@0/pci@6 |
/SYS/MB/PCIE7 |
8 |
0 |
0 |
1 |
/pci@340/pci@1/pci@0/pci@7 |
/SYS/MB/PCIE8 |
|