detecting hyperthreading

[Pokala, Ravi]

-----Original Message-----
From: "lokadamus at gmx.de" <lokadamus at gmx.de>
Date: 2015-03-10, Tuesday at 08:52
To: Ravi Pokala <rpokala at panasas.com>, Rui Paulo <rpaulo at me.com>
Cc: "freebsd-hackers at freebsd.org" <freebsd-hackers at freebsd.org>
Subject: Re: detecting hyperthreading

>Have you look at dmesg?
>My system is a P4 with HTT.
>dmesg |more
[...]
>CPU: Intel(R) Pentium(R) 4 CPU 3.00GHz (3000.00-MHz 686-class CPU)
>  Origin = "GenuineIntel"  Id = 0xf29  Family = 0xf  Model = 0x2
>Stepping = 9
>
>Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,M
>CA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
>  Features2=0x4400<CNXT-ID,xTPR>

Of course. :-)

But there are two problems:

(1) That just tells me HTT is supported by the CPU, not that if kernel is
using it.
(2) It's difficult to parse.

Of the two, (1) is the bigger concern for my use-case.

Thanks,

Ravi