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@xxxxxxxxx>:
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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