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From: Ivan Voras <ivoras@freebsd.org>
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Subject: Re: intel i7 and Hyperthreading
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Mike Tancsa wrote:

> FreeBSD 7.1-PRERELEASE #0: Fri Dec 19 19:48:15 EST 2008
>     mdtancsa@ns3c.recycle.net:/usr/obj/usr/src/sys/recycle
> Timecounter "i8254" frequency 1193182 Hz quality 0
> CPU: Intel(R) Core(TM) i7 CPU         920  @ 2.67GHz (2666.78-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  = 2138992640 (2039 MB)
> avail memory = 2084880384 (1988 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

I just thought of another thing - can you boot an 8-CURRENT kernel on 
the machine and report the value of kern.sched.topology_spec sysctl? 
This is to verify how the ULE sees the HTT topology of the CPUs.