From owner-freebsd-current@FreeBSD.ORG  Tue Jul  8 02:09:57 2003
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Date: Tue, 8 Jul 2003 11:09:41 +0200 (CEST)
From: Lukas Ertl <l.ertl@univie.ac.at>
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Subject: HTT on single CPU?
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Hi,

how do I enable Hyperthreading on a box that has just a single CPU?

From=20dmesg:

---8<---
CPU: Intel(R) Pentium(R) 4 CPU 2.53GHz (2523.99-MHz 686-class CPU)
  Origin =3D "GenuineIntel"  Id =3D 0xf27  Stepping =3D 7
Features=3D0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,=
MCA,C
MOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>

Programming 24 pins in IOAPIC #0
IOAPIC #0 intpin 2 -> irq 0
FreeBSD/SMP: Multiprocessor System Detected: 1 CPUs
 cpu0 (BSP): apic id:  0, version: 0x00050014, at 0xfee00000
 io0 (APIC): apic id:  2, version: 0x00178020, at 0xfec00000
---8<---

smp(4) mentions machdep.hlt_logical_cpus, but:

# sysctl machdep.hlt_logical_cpus
sysctl: unknown oid 'machdep.hlt_logical_cpus'

The kernel is 5.1-CURRENT from July 4.

regards,
le

--=20
Lukas Ertl                             eMail: l.ertl@univie.ac.at
UNIX-Systemadministrator               Tel.:  (+43 1) 4277-14073
Zentraler Informatikdienst (ZID)       Fax.:  (+43 1) 4277-9140
der Universit=E4t Wien                   http://mailbox.univie.ac.at/~le/