At 10:15 AM +1000 10/10/06, Arthur Hartwig wrote:
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)
Huh.
I just got a dual-core Athlon64 machine, and the features list for
it says:
Features=0x178bfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,
MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,MMX,FXSR,SSE,SSE2,
HTT>
---
My dmesg does not have the line about "Hyperthreading: 2 logical CPUs",
though. But I had been pretty sure the Athlon64 chips didn't have any
hyperthreading support. Why is the HTT there?
--
Garance Alistair Drosehn = [EMAIL PROTECTED]
Senior Systems Programmer or [EMAIL PROTECTED]
Rensselaer Polytechnic Institute or [EMAIL PROTECTED]
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