Hyperthread without BIOS enable

Markku Kolkka markkuk at tuubi.net
Fri Jan 21 12:31:13 UTC 2005


Thiago Guzella kirjoitti viestissään (lähetysaika perjantai, 21. 
tammikuuta 2005 04:01):
> Well, /proc/cpuinfo reports the HT feature flag as active, so
> this is a HT capable cpu.

No, the HT flag does _not_ indicate an actually HyperThreading 
capable CPU. My non-HyperThreaded P4 shows the HT flag:
$ cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 15
model           : 2
model name      : Intel(R) Pentium(R) 4 CPU 2.40GHz
stepping        : 4
cpu MHz         : 2410.358
cache size      : 512 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 mtrr 
pge mca cmov patpse36 clflush dts acpi mmx fxsr sse sse2 ss ht 
tm
bogomips        : 4784.12

If you really want to know if a P4 is HT capable, boot with a SMP 
kernel and see if it detects two CPUs.

-- 
 Markku Kolkka
 markku.kolkka at iki.fi




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