Pentium 805D has an interesting surprise

[Bill McGonigle]

On Apr 25, 2007, at 12:53, Shawn K. O'Shea wrote:

> ""ht" in 'flags' field of /proc/cpuinfo indicate that the processor
> supports the Machine Specific
> Registers to report back HT or multi-core capability. Additional
> fields (listed down below) in the
> CPU records of /proc/cpuinfo will give more precise information about
> the CPU topology as seen
> by the operating system. "

Right, 'ht' just reports whether the CPU knows it has hyperthreading  
or knows it doesn't have hyperthreading.  This tripped me up for a  
good hour once!

I have a 2.5GHz P4 here without hyperthreading, but it knows that it  
doesn't:

   $cat /proc/cpuinfo
   processor       : 0
   vendor_id       : GenuineIntel
   cpu family      : 15
   model           : 2
   model name      : Intel(R) Pentium(R) 4 CPU 2.50GHz
   stepping        : 9
   cpu MHz         : 2500.176
   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 pat
   pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe up cid xtpr
   bogomips        : 5002.39
   clflush size    : 64

It's not new enough to know that it doesn't have vt, so there's no vt  
flag.

-Bill

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