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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