HTT on single CPU?

Brooks Davis brooks at one-eyed-alien.net
Wed Jul 9 08:07:23 PDT 2003


On Wed, Jul 09, 2003 at 02:47:18PM +0200, Jens Rehsack wrote:
> Andrey Chernov wrote:
> 
> >On Tue, Jul 08, 2003 at 13:13:44 -0400, John Baldwin wrote:
> >
> >>You need to enable SMP and APIC_IO in your kernel to use HTT.  Also,
> >>the BIOS setting probably won't make a difference.
> >>
> >
> >
> >I have both APIC and HTT flags in my P4, but when I try to load kernel
> >compiled with APIC_IO and SMP, I got panic:
> >
> >pmap_bootstrap: no local apic! (non-SMP hardware?)
> >
> >Is it motherboard or BIOS? I have no Hyperthreading setting in the BIOS,
> >but PIC or APIC modes (both not works with MP kernel). Motherboard is ASUS 
> >P4B533.
> 
> Hm, I get a really other behaviour, but the result is no having two cpu's:
> 
> Copyright (c) 1992-2003 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.
> FreeBSD 5.1-CURRENT #0: Sat Jun 28 15:40:03 GMT 2003
>     root at moby.helpers.liwing.de:/usr/obj/usr/src/sys/MOBY
> Preloaded elf kernel "/boot/kernel/kernel" at 0xc03ef000.
> Preloaded elf module "/boot/kernel/acpi.ko" at 0xc03ef26c.
> Timecounter "i8254"  frequency 1193182 Hz
> Timecounter "TSC"  frequency 2400094284 Hz
> CPU: Intel(R) Pentium(R) 4 CPU 2.40GHz (2400.09-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>

P4's below ~3.1GHz do not actually provide logical CPU support.

-- Brooks
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