Logical versus Physical Processors
As previously described in “Assignment of IDs to the Processor” on page 860, if Hyper-Threading is enabled a unique Agent ID is assigned to each of the logical processors within each of the physical processors on the trailing-edge of reset. Table 45-1 on page 1150 defines the agent IDs assigned to each of the logical processors in a cluster consisting of four Xeon MP processors.
| BR1# | BR2# | BR3# | Physical Processor ID | ID of Logical Processor 0 | ID of Logical Processor 1 |
|---|---|---|---|---|---|
| 1 | 1 | 1 | 0 | 0 | 1 |
| 1 | 1 | 0 | 1 | 2 | 3 |
| 1 | 0 | 1 | 2 | 4 | 5 |
| 0 | 1 | 1 | 3 | 6 | 7 |
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