2.6.26 : Strange processor / core mapping with Intel Q6600
From: paniscus
Date: Sat Aug 08 2009 - 17:53:33 EST
Hello,
It seems that the cpu / core-id mapping has changed since vanilla 2.6.26 (also
2.6.26.8, 2.6.27.29) with an Intel Core 2 Quad Q6600.
With 2.6.25.20 I have a correct mapping :
Processor 0 <---> Core-id 0
Processor 1 <---> Core-id 1
Processor 2 <---> Core-id 2
Processor 3 <---> Core-id 3
With 2.6.26 :
I have a this strange mapping :
Processor 0 <---> Core-id 0
Processor 1 <---> Core-id 2
Processor 2 <---> Core-id 3
Processor 3 <---> Core-id 1
/proc/cpuinfo with 2.6.26 :
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz
stepping : 11
cpu MHz : 1600.000
cache size : 4096 KB
physical id : 0
siblings : 4
core id : 0
cpu cores : 4
...
...
processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz
stepping : 11
cpu MHz : 1600.000
cache size : 4096 KB
physical id : 0
siblings : 4
core id : 2
cpu cores : 4
...
...
processor : 2
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz
stepping : 11
cpu MHz : 1600.000
cache size : 4096 KB
physical id : 0
siblings : 4
core id : 3
cpu cores : 4
...
...
processor : 3
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz
stepping : 11
cpu MHz : 1600.000
cache size : 4096 KB
physical id : 0
siblings : 4
core id : 1
cpu cores : 4
...
...
I would appreciate it if you could help me on this. Is it maybe already an known
issue ?
regards,
-Franck.
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