redhat detecting too many cpus?

[Gavin McDonald]

I've got ~ 15 machines with dual Hyper-threaded CPUs (some Intel, some
AMD64,) and all run RHEL ES 3.5 with no CPU-related problems. 

Regards,

Gavin McDonald
========================
EVI Logistic Enterprises
email: me at gavitron.com
phone: (604) 313-3845


> -----Original Message-----
> From: redhat-list-bounces at redhat.com [mailto:redhat-list-
> bounces at redhat.com] On Behalf Of Martin Campbell
> Sent: Wednesday, January 11, 2006 11:28 AM
> To: redhat-list at redhat.com
> Subject: Re: redhat detecting too many cpus?
> 
> 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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