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SubjectRe: HT not active
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On Mon, 2006-08-14 at 13:38 +0200, Jan Engelhardt 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 */


the "ht" flag does not mean what you think it means.....
it does NOT mean "I can use hyperthreading on this machine"; it
basically means "the ht cpuid commands work", so that linux can find the
nr of siblings, which can be..... 1
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