redhat detecting too many cpus?

[Martin Campbell]

the Intel Xeon's chips come with hyper-threading. Hyper-Threading is 
basically just a clever way of making a single chip operate like two 
separate devices without implementing two cores on one die ... i think 
its intel's pre cursor to multi core chips.

You can disable hyper threading, i've heard of some people talking 
about hyper-threading having a negative effect on RHAS ... but i'm not 
sure - perhaps some else on this list might be able to comment?

ta
martin.


Quoting Harjinder Singh <p_singhha at yahoo.com>:

>   I'm currently running Red Hat ES 4.0 on a server, which has two 
> Xeon 2.8 MHz Processors, installed.  However when I run cat 
> /proc/cpuinfo to retrieve the CPU info it lists 4 processors 
> installed.
>
>  Is there something wrong with the configuration of my Linux 
> installation?  Does anyone know why it would list 4 cpus when I only 
> have 2 installed?
>
>  Below is the out of cat /proc/cpuinfo,  Thanks!
>
> processor    : 0
> vendor_id    : GenuineIntel
> cpu family    : 15
> model        : 2
> model name    : Intel(R) Xeon(TM) CPU 2.80GHz
> stepping    : 5
> cpu MHz        : 2788.974
> cache size    : 512 KB
> physical id    : 0
> siblings    : 2
> core id        : 0
> cpu cores    : 1
> 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 cid 
> xtpr
> bogomips    : 5488.64
>
> processor    : 1
> vendor_id    : GenuineIntel
> cpu family    : 15
> model        : 2
> model name    : Intel(R) Xeon(TM) CPU 2.80GHz
> stepping    : 5
> cpu MHz        : 2788.974
> cache size    : 512 KB
> physical id    : 0
> siblings    : 2
> core id        : 0
> cpu cores    : 1
> 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 cid 
> xtpr
> bogomips    : 5570.56
>
> processor    : 2
> vendor_id    : GenuineIntel
> cpu family    : 15
> model        : 2
> model name    : Intel(R) Xeon(TM) CPU 2.80GHz
> stepping    : 5
> cpu MHz        : 2788.974
> cache size    : 512 KB
> physical id    : 3
> siblings    : 2
> core id        : 3
> cpu cores    : 1
> 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 cid 
> xtpr
> bogomips    : 5554.17
>
> processor    : 3
> vendor_id    : GenuineIntel
> cpu family    : 15
> model        : 2
> model name    : Intel(R) Xeon(TM) CPU 2.80GHz
> stepping    : 5
> cpu MHz        : 2788.974
> cache size    : 512 KB
> physical id    : 3
> siblings    : 2
> core id        : 3
> cpu cores    : 1
> 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 cid 
> xtpr
> bogomips    : 5570.56
>
>
>

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