linux-kernel - Re: [PATCH 0/8 v5] x86: Adapt CPU topology detection for AMD Magny-Cours

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Date:	Thu, 13 Aug 2009 11:21:51 +0200
From:	Andreas Herrmann <andreas.herrmann3@....com>
To:	Alex Chiang <achiang@...com>
CC:	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org,
	Borislav Petkov <borislav.petkov@....com>,
	Brice Goglin <Brice.Goglin@...ia.fr>
Subject: Re: [PATCH 0/8 v5] x86: Adapt CPU topology detection for AMD
	Magny-Cours

On Wed, Aug 12, 2009 at 05:22:07PM -0600, Alex Chiang wrote:
> Hi Andreas,
> 
> * Andreas Herrmann <andreas.herrmann3@....com>:
> > Changes to previous patch set:
> > - added patch to swap semantic of cpu_node_siblings and core_siblings
> > - new patch to convert alloc/clear of cpumask to zalloc
> > - added patch to update cputopology documentation
> > 
> > Current patch set contains 8 patches:
> > - patch 1 adapts common code to show cpu_node_id,
> >   cpu_node_siblings and cpu_node_siblings_list in
> >   /sys/devices/system/cpu/cpu*/topology
> > - patch 2 prepares arch/x86 to provide cpu_node information
> > - patch 3 sets up cpu_node information for AMD Magny-Cours CPU
> 
> Do only Magny-Cours have the concept of a 'node' or should
> Istanbul have nodes too?

Magny-Cours will be the first AMD processor having two internal nodes.
Istanbul is one node per socket. See your output, node_id is always 0.
You have 6 cores per socket. And with each socket (every 6 cores)
the physical_id changes.

With Magny-Cours up 12 cores will have the same physical_id as they
are all on the same socket. But 6 cores out of that will have node_id
0 and the other 6 cores will have node_id 1.


Regards,
Andreas

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> Here is the output of my system with your patchset applied.
> First, a representative entry from /proc/cpuinfo.
> 
> processor	: 0
> vendor_id	: AuthenticAMD
> cpu family	: 16
> model		: 8
> model name	: Six-Core AMD Opteron(tm) Processor 8439 SE
> stepping	: 0
> cpu MHz		: 800.000
> cache size	: 512 KB
> physical id	: 0
> siblings	: 6
> node id		: 0
> core id		: 0
> cpu cores	: 6
> apicid		: 0
> initial apicid	: 0
> fpu		: yes
> fpu_exception	: yes
> cpuid level	: 5
> wp		: yes
> flags		: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nonstop_tsc extd_apicid pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt
> bogomips	: 5586.65
> TLB size	: 1024 4K pages
> clflush size	: 64
> cache_alignment	: 64
> address sizes	: 48 bits physical, 48 bits virtual
> power management: ts ttp tm stc 100mhzsteps hwpstate
> 
> I do have the powernow_k8 module loaded too (so ignore the funny
> MHz output).
> 
> # lsmod | grep k8
> powernow_k8            13764  0 
> processor              47724  1 powernow_k8
> 
> Here is the output with just a few fields selected.
> 
> # cat /proc/cpuinfo | egrep '^node|^core|processor|^physical|apicid' 
> processor	: 0
> physical id	: 0
> node id		: 0
> core id		: 0
> apicid		: 0
> initial apicid	: 0
> processor	: 1
> physical id	: 1
> node id		: 0
> core id		: 0
> apicid		: 8
> initial apicid	: 8
> processor	: 2
> physical id	: 2
> node id		: 0
> core id		: 0
> apicid		: 16
> initial apicid	: 16
> processor	: 3
> physical id	: 3
> node id		: 0
> core id		: 0
> apicid		: 24
> initial apicid	: 24
> processor	: 4
> physical id	: 4
> node id		: 0
> core id		: 0
> apicid		: 32
> initial apicid	: 32
> processor	: 5
> physical id	: 5
> node id		: 0
> core id		: 0
> apicid		: 40
> initial apicid	: 40
> processor	: 6
> physical id	: 6
> node id		: 0
> core id		: 0
> apicid		: 48
> initial apicid	: 48
> processor	: 7
> physical id	: 7
> node id		: 0
> core id		: 0
> apicid		: 56
> initial apicid	: 56
> processor	: 8
> physical id	: 0
> node id		: 0
> core id		: 1
> apicid		: 1
> initial apicid	: 1
> processor	: 9
> physical id	: 1
> node id		: 0
> core id		: 1
> apicid		: 9
> initial apicid	: 9
> processor	: 10
> physical id	: 2
> node id		: 0
> core id		: 1
> apicid		: 17
> initial apicid	: 17
> processor	: 11
> physical id	: 3
> node id		: 0
> core id		: 1
> apicid		: 25
> initial apicid	: 25
> processor	: 12
> physical id	: 4
> node id		: 0
> core id		: 1
> apicid		: 33
> initial apicid	: 33
> processor	: 13
> physical id	: 5
> node id		: 0
> core id		: 1
> apicid		: 41
> initial apicid	: 41
> processor	: 14
> physical id	: 6
> node id		: 0
> core id		: 1
> apicid		: 49
> initial apicid	: 49
> processor	: 15
> physical id	: 7
> node id		: 0
> core id		: 1
> apicid		: 57
> initial apicid	: 57
> processor	: 16
> physical id	: 0
> node id		: 0
> core id		: 2
> apicid		: 2
> initial apicid	: 2
> processor	: 17
> physical id	: 1
> node id		: 0
> core id		: 2
> apicid		: 10
> initial apicid	: 10
> processor	: 18
> physical id	: 2
> node id		: 0
> core id		: 2
> apicid		: 18
> initial apicid	: 18
> processor	: 19
> physical id	: 3
> node id		: 0
> core id		: 2
> apicid		: 26
> initial apicid	: 26
> processor	: 20
> physical id	: 4
> node id		: 0
> core id		: 2
> apicid		: 34
> initial apicid	: 34
> processor	: 21
> physical id	: 5
> node id		: 0
> core id		: 2
> apicid		: 42
> initial apicid	: 42
> processor	: 22
> physical id	: 6
> node id		: 0
> core id		: 2
> apicid		: 50
> initial apicid	: 50
> processor	: 23
> physical id	: 7
> node id		: 0
> core id		: 2
> apicid		: 58
> initial apicid	: 58
> processor	: 24
> physical id	: 0
> node id		: 0
> core id		: 3
> apicid		: 3
> initial apicid	: 3
> processor	: 25
> physical id	: 1
> node id		: 0
> core id		: 3
> apicid		: 11
> initial apicid	: 11
> processor	: 26
> physical id	: 2
> node id		: 0
> core id		: 3
> apicid		: 19
> initial apicid	: 19
> processor	: 27
> physical id	: 3
> node id		: 0
> core id		: 3
> apicid		: 27
> initial apicid	: 27
> processor	: 28
> physical id	: 4
> node id		: 0
> core id		: 3
> apicid		: 35
> initial apicid	: 35
> processor	: 29
> physical id	: 5
> node id		: 0
> core id		: 3
> apicid		: 43
> initial apicid	: 43
> processor	: 30
> physical id	: 6
> node id		: 0
> core id		: 3
> apicid		: 51
> initial apicid	: 51
> processor	: 31
> physical id	: 7
> node id		: 0
> core id		: 3
> apicid		: 59
> initial apicid	: 59
> processor	: 32
> physical id	: 0
> node id		: 0
> core id		: 4
> apicid		: 4
> initial apicid	: 4
> processor	: 33
> physical id	: 1
> node id		: 0
> core id		: 4
> apicid		: 12
> initial apicid	: 12
> processor	: 34
> physical id	: 2
> node id		: 0
> core id		: 4
> apicid		: 20
> initial apicid	: 20
> processor	: 35
> physical id	: 3
> node id		: 0
> core id		: 4
> apicid		: 28
> initial apicid	: 28
> processor	: 36
> physical id	: 4
> node id		: 0
> core id		: 4
> apicid		: 36
> initial apicid	: 36
> processor	: 37
> physical id	: 5
> node id		: 0
> core id		: 4
> apicid		: 44
> initial apicid	: 44
> processor	: 38
> physical id	: 6
> node id		: 0
> core id		: 4
> apicid		: 52
> initial apicid	: 52
> processor	: 39
> physical id	: 7
> node id		: 0
> core id		: 4
> apicid		: 60
> initial apicid	: 60
> processor	: 40
> physical id	: 0
> node id		: 0
> core id		: 5
> apicid		: 5
> initial apicid	: 5
> processor	: 41
> physical id	: 1
> node id		: 0
> core id		: 5
> apicid		: 13
> initial apicid	: 13
> processor	: 42
> physical id	: 2
> node id		: 0
> core id		: 5
> apicid		: 21
> initial apicid	: 21
> processor	: 43
> physical id	: 3
> node id		: 0
> core id		: 5
> apicid		: 29
> initial apicid	: 29
> processor	: 44
> physical id	: 4
> node id		: 0
> core id		: 5
> apicid		: 37
> initial apicid	: 37
> processor	: 45
> physical id	: 5
> node id		: 0
> core id		: 5
> apicid		: 45
> initial apicid	: 45
> processor	: 46
> physical id	: 6
> node id		: 0
> core id		: 5
> apicid		: 53
> initial apicid	: 53
> processor	: 47
> physical id	: 7
> node id		: 0
> core id		: 5
> apicid		: 61
> initial apicid	: 61
> 
> Thanks.
> 
> /ac
> 
> 



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