Documentation/powerpc/associativity.rst

9 are represented as being members of a sub-grouping domain. This performance
11 From the platform view, these groups are also referred to as domains.
17 Hypervisor indicates the type/form of associativity used via "ibm,architecture-vec-5 property".
18 Bit 0 of byte 5 in the "ibm,architecture-vec-5" property indicates usage of Form 0 or Form 1.
20 bit 2 of byte 5 in the "ibm,architecture-vec-5" property is used.
23 ------
27 ------
28 With Form 1 a combination of ibm,associativity-reference-points, and ibm,associativity
29 device tree properties are used to determine the NUMA distance between resource groups/domains.
34 The “ibm,associativity-reference-points” property contains a list of one or more numbers
43 if they belong to the same higher-level domains. For mismatch at every higher
48 -------
49 Form 2 associativity format adds separate device tree properties representing NUMA node distance
52 "ibm,associativity-reference-points" property, Form 2 allows a large number of primary domain
57 "ibm,architecture-vec-5" property.
59 "ibm,numa-lookup-index-table" property contains a list of one or more numbers representing
61 used as an index while computing numa distance information via "ibm,numa-distance-table".
63 prop-encoded-array: The number N of the domainIDs encoded as with encode-int, followed by
64 N domainID encoded as with encode-int
67 "ibm,numa-lookup-index-table" =  {4, 0, 8, 250, 252}. The offset of domainID 8 (2) is used when
71 "ibm,numa-distance-table" property contains a list of one or more numbers representing the NUMA
74 prop-encoded-array: The number N of the distance values encoded as with encode-int, followed by
75 N distance values encoded as with encode-bytes. The max distance value we could encode is 255.
77 numa-lookup-index-table.
80 ibm,numa-lookup-index-table = <3 0 8 40>;
81 ibm,numa-distace-table = <9>, /bits/ 8 < 10  20  80 20  10 160 80 160  10>;
86 	--|------------
100 With "ibm,associativity-reference-points"  { 0x3 }
102 "ibm,lookup-index-table" helps in having a compact representation of distance matrix.
104 With "ibm,lookup-index-table" we can achieve a compact representation of