What is the real number of CPUs ? -- was: Re: Problem with new Intel DX board and i7 Processor on reboot attempt (locks)

[pluknet]

2009/2/20 martinko <gamato at users.sf.net>:
> Mike Tancsa wrote:
>>
>> At 01:08 PM 2/18/2009, Karl Denninger wrote:
>>>
>>> Running 7-STABLE, compiled last night.
>>>
>>> When attempting to reboot the system freezes at "stopping other CPUs" and
>>> has to be hard-reset with either the power button or the RESET switch.  The
>>> problem is easily reproduced - typing "reboot" produces it :-)
>>>
>>> I'm wondering if that ACPI warning in the boot sequence is involved in
>>> this, and if so, if there is a recommended workaround?
>>>
>>> Here's the "dmesg" from the subject system:
>>
>> Hi,
>>        I have the same chipset, but dont see the reboot problem on
>> RELENG_7 from Jan 7th. (via "shutdown -r now")  Have you checked for BIOS
>> updates ?
>>
>>        ---Mike
>>
>>
>> CPU: Intel(R) Core(TM) i7 CPU         920  @ 2.67GHz (2666.77-MHz
>> 686-class CPU)
>>  Origin = "GenuineIntel"  Id = 0x106a4  Stepping = 4
>>
>>  Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,
>> HTT,TM,PBE>
>>
>>  Features2=0x98e3bd<SSE3,DTES64,MON,DS_CPL,VMX,EST,TM2,SSSE3,CX16,xTPR,PDCM,SSE4.1,SSE4.2,POPCNT>
>>  AMD Features=0x28100000<NX,RDTSCP,LM>
>>  AMD Features2=0x1<LAHF>
>>  Cores per package: 8
>>  Logical CPUs per core: 2
>> real memory  = 3212734464 (3063 MB)
>> avail memory = 3139563520 (2994 MB)
>> ACPI APIC Table: <INTEL  DX58SO  >
>> FreeBSD/SMP: Multiprocessor System Detected: 8 CPUs
>>  cpu0 (BSP): APIC ID:  0
>>  cpu1 (AP): APIC ID:  1
>>  cpu2 (AP): APIC ID:  2
>>  cpu3 (AP): APIC ID:  3
>>  cpu4 (AP): APIC ID:  4
>>  cpu5 (AP): APIC ID:  5
>>  cpu6 (AP): APIC ID:  6
>>  cpu7 (AP): APIC ID:  7
>> ACPI Warning (tbfadt-0505): Optional field "Pm2ControlBlock" has zero
>> address or length:        0     450/0 [20070320]
>> ioapic0 <Version 2.0> irqs 0-23 on motherboard
>>
>
> Hi,
>
> I don't get the numbers of CPUs -- AFAIK Core i7 has 4 cores with 2 logical
> CPUs per core (hyper-threading?) and that makes 8 logical CPUs.  Above I see
> 8 cores per package (!) _but_ 8 x 2 = 16 while only 8 CPUs are detected and
> started.  Could someone explain pls ?

The term "package" implies a physical socket.

-- 
wbr,
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