Inconsistency in /proc/cpuinfo about topology ?

[JA MagallÃn]

Hi...

Probably there is something I don't understand, but it looks to me like an
inconsistency in the info given by /proc/cpuinfo about processor/core/thread
topology.

For new processors, data seems to account for each 'physycal id', all virtual
processors in the same package repeat the same info:
- Core i5:
   physical id	: 0
   siblings	: 4
   cpu cores	: 4
- Core i3:
   physical id	: 0
   siblings	: 4
   cpu cores	: 2
- Dual Xeon X5365
   physical id	: 0
   siblings	: 4
   cpu cores	: 4
   physical id	: 1
   siblings	: 4
   cpu cores	: 4
- Core Q9450
   physical id	: 0
   siblings	: 4
   cpu cores	: 4

but for older CPUs or lower end it is not the same:
- Dual P4-Xeon:
   physical id	: 0
   siblings	: 1
   cpu cores	: 1
   physical id	: 0
   siblings	: 1
   cpu cores	: 0
   physical id	: 3
   siblings	: 1
   cpu cores	: 1
   physical id	: 3
   siblings	: 1
   cpu cores	: 0

- Single P4 HT:
   physical id	: 0
   siblings	: 1
   cpu cores	: 1
   physical id	: 0
   siblings	: 1
   cpu cores	: 0

What am I missing ?

TIA

--
J.A. Magallon <jamagallon()ono!com>        \               Winter is coming...
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