Advanced Configuration and Power Interface Specification

Advanced Configuration and Power Interface Specification
Return Value:
A Buffer containing a system locality information table
If System Locality i ≥ N, where N is the number of System Localities, the _SLI method returns a
buffer that contains these relative distances:
[(i, 0), (i, 1), …, (i, i-1), (i, i), (0, i), (1, i), …(i-1, i), (i, i)]
If System Locality i < N, the _SLI method returns a buffer that contains these relative distances:
[(i, 0), (i, 1), …, (i, i), …,(i, N-1), (0, i), (1, i),…(i, i), …, (N-1, i)]
Note: (i, i) is always a value of 10.
Node 0 Node 1 Node 2 Node n
Interconnect
Figure 6-37 System Locality information Table
Figure 6-37diagrams a 4-node system where the nodes are numbered 0 through 3 (Node n = Node 3)
and the granularity is at the node level for the NUMA distance information. In this example we
assign System Localities / Proximity Domain numbers equal to the node numbers (0-3). The NUMA
relative distances between proximity domains as implemented in this system are described in the
matrix represented in Table 6-181. Proximity Domains are represented by the numbers in the top
row and left column. Distances are represented by the values in cells internal in the table from the
domains.
Table 6-181 Example Relative Distances Between Proximity Domains
Proximity Domain 0 1 2 3
0 10 15 20 18
1 15 10 16 24
2 20 16 10 12
3 18 24 12 10
An example of these distances between proximity domains encoded in a System Locality
Information Table for consumption by OSPM at boot time is described in Table 6-182.
Table 6-182 Example System Locality Information Table
Field
Byte
Length
Byte
Offset
Description
Header
326 April, 2015 Version 6.0