HT not active

[Jan Engelhardt <jengelh@linux01.gwdg.de>]

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.


Jan Engelhardt
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