Specifications

For a detailed discussion of the HP PREMA architecture, see the technical overview at:

http://h20195.www2.hp.com/V2/GetPDF.aspx/4AA3-0643ENW.pdf

Linux Hardware Overview

CPU Mappings

Linux enumerates logical processors as follows, using the /proc/cpuinfo file:

Logical

Processor

Physical

Core

APIC

Logical

Processor

Physical

Core

APIC

0 0 0 0 64 0 0 1

1 0 1 2 65 0 1 3

2 0 2 4 66 0 2 5

3 0 3 6 67 0 3 7

4 0 8 16 68 0 8 17

5 0 9 18 69 0 9 19

6 0 10 20 70 0 10 21

7 0 11 22 71 0 11 23

8 1 0 32 72 1 0 33

9 1 1 34 73 1 1 35

10 1 2 36 74 1 2 37

11 1 3 38 75 1 3 39

12 1 8 48 76 1 8 49

13 1 9 50 77 1 9 51

14 1 10 52 78 1 10 53

15 1 11 54 79 1 11 55

The above table shows the logical processor assignments for the first two processors from a 64-core

DL980 (8 processors with 8 cores per processor) with Hyper-threading enabled. The Physical ID is the

physical processor socket. Core ID is the processing core on a particular physical processor. Thus, logical

processor numbers 0 and 64 are the two threads on the first core on the first physical processor. Refer to

this table when using the numactl or taskset commands for process and memory object placement

(discussed later in this document).

PCI Slot Mappings

PCI slot bus numbers are documented in the HP ProLiant DL980 G7 QuickSpecs and can be used to map

a particular I/O slot to PCI device listed by lspci.

0b:00.0 Fibre Channel: QLogic Corp. ISP2532-based 8Gb Fibre Channel to PCI Express HBA (rev 02)

0b:00.1 Fibre Channel: QLogic Corp. ISP2532-based 8Gb Fibre Channel to PCI Express HBA (rev 02)

11:00.0 Fibre Channel: QLogic Corp. ISP2532-based 8Gb Fibre Channel to PCI Express HBA (rev 02)

11:00.1 Fibre Channel: QLogic Corp. ISP2532-based 8Gb Fibre Channel to PCI Express HBA (rev 02)

This example shows a dual-port Fibre Channel HBA using bus 0x0b and 0x11, which maps to slots 9 and

11, respectively.