SMP with HTT disabled

[Julian Elischer]

John Baldwin wrote:

>On Thursday 26 May 2005 05:04 pm, Singh, Vijay wrote:
>  
>
>>Hello, I am trying to disable HTT to run some tests. From dmesg I have:
>>
>>CPU: Intel(R) Xeon(TM) CPU 2.66GHz (2666.77-MHz 686-class CPU)
>>  Origin = "GenuineIntel"  Id = 0xf29  Stepping = 9
>>
>>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,S
>>SE2,SS,HTT,TM,PBE>
>>  Hyperthreading: 2 logical CPUs
>>real memory  = 1073676288 (1023 MB)
>>avail memory = 1041121280 (992 MB)
>>ACPI APIC Table: <A M I  OEMAPIC >
>>FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
>> cpu0 (BSP): APIC ID:  0
>> cpu1 (AP): APIC ID:  1
>>
>># cat /boot/loader.conf
>>machdep.hlt_logical_cpus=1
>>
>>And mptable output is below. It seems to me that the kernel does not
>>bring up the 2nd physical CPU. Am I right or wrong.
>>    
>>
>
>The kernel only sees 1 physical CPU.  The MPTable only shows 1 physical CPU as 
>well:
>  
>


note that mptable shows both HTT cpus on some motherboards and only one 
entry
per chip on others.

>>MP Config Base Table Entries:
>>
>>--
>>
>>Processors: APIC ID Version State Family Model Step Flags
>>
>>0 0x14 BSP, usable 15 2 9 0xbfebfbff
>>
>>--
>>    
>>
>
>  
>