Date: Tue, 10 Oct 2006 10:15:39 +1000 From: Arthur Hartwig <arthur.hartwig@nokia.com> To: ext kumaresh pandian <kumareshkp@yahoo.co.in> Cc: freebsd-smp@freebsd.org Subject: Re: Hyperthreading Issues Message-ID: <452AE62B.4000000@nokia.com> In-Reply-To: <20061009114520.1355.qmail@web8608.mail.in.yahoo.com> References: <20061009114520.1355.qmail@web8608.mail.in.yahoo.com>
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ext kumaresh pandian wrote:
> Hi all
>
>
> How do i Find if the CPU is Hyperthreading enabled or not? I have tried using the mtables but i'm not able to figure it out.
>
Look for the HTT bit in the CPU features displayed when FreeBSD starts
up. Here's an example from one of my systems, HTT is third from the
right hand end of the CPU features list.
Copyright (c) 1992-2005 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
The Regents of the University of California. All rights reserved.
hartwig 1 10.09.2006-151040MPTable: <OEM ID PRODUCT ID >
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Xeon(TM) CPU 2.80GHz (2794.59-MHz 686-class CPU)
Origin = "GenuineIntel" Id = 0xf27 Stepping = 7
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=0x4400<CNTX-ID,<b14>>
Hyperthreading: 2 logical CPUs
real memory = 2147483648 (2048 MB)
avail memory = 2100936704 (2003 MB)
Arthur
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