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SubjectRe: [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@amd.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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