[lug] cpuinfo shows hyperthreading enabled, but no hyperthreading seen

[Davide Del Vento]

Have you tried this
http://software.intel.com/en-us/articles/using-enhanced-intel-speedstep-features-in-hpc-clusters
?

On Fri, Oct 12, 2012 at 1:45 PM, Michael Hirsch <mdhirsch at gmail.com> wrote:
> I have server with a single quad-core cpu.  It's a kinda old Xeon, and we'd
> like to get the most out of it.  I had thought that it was a dual-core with
> hyperthreading, but a bit more research shows that it is a quad-core with no
> hyperthreading.
>
> As you can see from this output, there are 4 processors and 4 cores, all on
> one physical id.  I think this means that there are no CPUs due to
> hyperthreading.  If you look at the flags, it has "ht" that I thought meant
> hyperthreading is enabled, both in the BIOS and in the kernel.  But
> apparently not.
>
> Anyone know how to enable hyperthreading?
>
> [root at manzanita log]# grep -E "processor|physical id|core id|flags"
> /proc/cpuinfo
> processor       : 0
> physical id     : 0
> core id         : 0
> 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 syscall nx rdtscp
> lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx smx est tm2 ssse3
> cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
> processor       : 1
> physical id     : 0
> core id         : 1
> 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 syscall nx rdtscp
> lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx smx est tm2 ssse3
> cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
> processor       : 2
> physical id     : 0
> core id         : 2
> 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 syscall nx rdtscp
> lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx smx est tm2 ssse3
> cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
> processor       : 3
> physical id     : 0
> core id         : 3
> 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 syscall nx rdtscp
> lm constant_tsc ida nonstop_tsc pni monitor ds_cpl vmx smx est tm2 ssse3
> cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
>
> Thanks,
>
> Michael
>
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