linux-kernel - 2.6.26 : Strange processor / core mapping with Intel Q6600

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Date:	Sat, 08 Aug 2009 23:52:37 +0200
From:	paniscus@...e.fr
To:	linux-kernel@...r.kernel.org
Subject: 2.6.26 : Strange processor / core mapping with Intel Q6600

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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