SMP with HTT disabled

[John Baldwin]

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:

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

-- 
John Baldwin <jhb at FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org