Re: SMP hyperthreading and bi-processors
Thank you for reply.
No, Hyperthreading is activated in the BIOS.
More over, I tried to desactivate it in the BIOS, just to see
the result.
That was very strange.
I was still able to see two processors in my /proc/cpuinfo,
but this time the physical IDs were identical!
Regard
> On Thu, Feb 16, 2006 at 07:12:44PM +0100, sebastien.prouff
wrote:
> > Good morning/afternoon,
> >
> > I have a problem on a bi-Xeon Server.
> > I just installed (two days ago) the debian sarge for AMD64.
> > The server is a bi-Xeon with hyperthreading.
> > So, I have to see 4 processors in /proc/cpuinfo (that what I
> > understood on various forums...) and I only see 2 processors.
> >
> > THis is the result of /proc/cpuinfo.
> >
> > Djak:/usr/src/kernel-headers-2.6.8-11-em64t-p4-smp# cat
> > /proc/cpuinfo
> > processor : 0
> > vendor_id : GenuineIntel
> > cpu family : 15
> > model : 4
> > model name : Intel(R) Xeon(TM) CPU
3.20GHz
> > stepping : 3
> > cpu MHz : 3200.253
> > cache size : 0 KB
> > physical id : 0
> > siblings : 1
> > fpu : yes
> > fpu_exception : yes
> > cpuid level : 3
> > 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 syscall nx lm pni monitor ds_cpl cid cmpxchg16b
> > bogomips : 6324.22
> > clflush size : 64
> > cache_alignment : 128
> > address sizes : 36 bits physical, 48 bits virtual
> > power management:
> >
> > processor : 1
> > vendor_id : GenuineIntel
> > cpu family : 15
> > model : 4
> > model name : Intel(R) Xeon(TM) CPU
3.20GHz
> > stepping : 3
> > cpu MHz : 3200.253
> > cache size : 0 KB
> > physical id : 3
> > siblings : 1
> > fpu : yes
> > fpu_exception : yes
> > cpuid level : 5
> > 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 syscall nx lm pni monitor ds_cpl cid cmpxchg16b
> > bogomips : 6389.76
> > clflush size : 64
> > cache_alignment : 128
> > address sizes : 36 bits physical, 48 bits virtual
> > power management:
> >
> > So, instead of 4 results, I have just two results.
> > - As you can see, there is the flags ht activated
> > - the physical_id number is different so it is two different
> > physical processor.
> >
> > This is my kernel :
> > Linux Djak 2.6.8-11-em64t-p4-smp #1 SMP Mon Oct 3 00:07:51
> > CEST 2005 x86_64 GNU/Linux
> >
> > As I download the header for this kernel, I try to see with a
> > make menuconfig is something go wrong.
> > Well, I did not see any problem, the processor type is EM64T
> > with SMP activated up to 8 processors.
> >
> > So please help, because I'm stick
> > I am waiting for your ideas.
>
> Is hyperthreading disabled in the BIOS perhaps? Many
servers ship that
> way since in some cases hyperthreading hurts performance
rather than
> help it.
>
> Len Sorensen
>
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