Re: HT not active

["Michal Piotrowski" <michal.k.k.piotrowski@gmail.com>]

Hi Jan,

On 14/08/06, Jan Engelhardt <jengelh@linux01.gwdg.de> wrote:
> Hello list,
>
>
>
> I cannot get HT to be used on some machine:
>
> w04a# cat /proc/cpuinfo
> processor       : 0
> vendor_id       : GenuineIntel
> cpu family      : 15
> model           : 0
> model name      : Intel(R) Pentium(R) 4 CPU 1700MHz
> stepping        : 10
> cpu MHz         : 1694.890
> cache size      : 256 KB
> fdiv_bug        : no
> hlt_bug         : no
> f00f_bug        : no
> coma_bug        : no
> fpu             : yes
> fpu_exception   : yes
> cpuid level     : 2
> wp              : yes
> flags           : 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 ht tm up
> bogomips        : 3393.46
>
> 'ht' indicates:
> #define X86_FEATURE_HT          (0*32+28) /* Hyper-Threading */
>
> so I installed an SMP kernel, which has
> CONFIG_SMP=y
> CONFIG_SUSPEND_SMP=y
> CONFIG_X86_FIND_SMP_CONFIG=y
> CONFIG_SCHED_SMT=y
> CONFIG_X86_HT=y
>
> yet it shows the 'up' flag in cpuinfo
> #define X86_FEATURE_UP          (3*32+ 9) /* smp kernel running on up */
>
> What could be missing? Some BIOS option perhaps?
> Thanks for any hints.

Do you have CONFIG_NR_CPUS=2 in kernel config?

> Jan Engelhardt
> --

Regards,
Michal

--
Michal K. K. Piotrowski
LTG - Linux Testers Group
(http://www.stardust.webpages.pl/ltg/wiki/)
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