Re: Kernel reports 4 CPUS instead of 2...

[Bryan Whitehead <driver@jpl.nasa.gov>]

My /proc/cpuinfo says I have ht CPU's... but i only see 2 CPU's... (Yet 
I have 2 1.7Ghz XEONs in the box so shouldn't I see 4?)

It's a Dell Precisions 530 workstation.

Does intel have ht CPU's that are messed up? and I'm one of the "lucky 
ones". ?

Building a kernel myself did not help... Any idea's?

[driver@mulan ~]$ cat /proc/cpuinfo
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 15
model		: 1
model name	: Intel(R) Xeon(TM) CPU 1.70GHz
stepping	: 2
cpu MHz		: 1694.863
cache size	: 256 KB
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 sep mtrr pge mca cmov 
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm
bogomips	: 3381.65

processor	: 1
vendor_id	: GenuineIntel
cpu family	: 15
model		: 1
model name	: Intel(R) Xeon(TM) CPU 1.70GHz
stepping	: 2
cpu MHz		: 1694.863
cache size	: 256 KB
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 sep mtrr pge mca cmov 
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm
bogomips	: 3381.65


Richard B. Johnson wrote:
> On Wed, 16 Oct 2002, Mark Cuss wrote:
> 
> 
>>Hello all
>>
>>I'm working with a new Dell Poweredge 4600 Server with Dual CPUs.  However,
>>Linux reports that it sees 4 CPUs...  I have opened the thing to see if Dell
>>gave me 2 extras for free, but no luck:  Attached is /proc/cpuinfo.
>>
>>I've tried the RedHat 8.0 stock kernel, as well as a freshly compiled 2.4.19
>>but both exhibit the same behavior.
>>
>>The specifics on the machine:
>>
>>Dual Xeon 2.2 GHz CPUs (512 k L2 cache)
>>2 Gigs DDR RAM
>>The chipset is a ServerWorks CMIC-HE (see attached lspci for complete
>>listing).
>>
>>Has anyone else seen this behavior?  The only other SMP machine I have is an
>>older Dell server with Dual 1 GHz coppermines, and it reports 2 CPUs...
>>
>>Any information or advice is greatly appreciated...
>>
>>Thanks in Advance,
>>
>>Mark
>>
> 
> 
> This has become a FAQ. The processors are capable of so-called
> "hyperthreading". They have two execution units, therefore seem
> like two CPUs.
> 
> This is the correct behavior. If you don't like this, you can
> swap motherboards with me ;) Otherwise, grin and bear it!
> 
> 
> Cheers,
> Dick Johnson
> Penguin : Linux version 2.4.18 on an i686 machine (797.90 BogoMips).
> The US military has given us many words, FUBAR, SNAFU, now ENRON.
> Yes, top management were graduates of West Point and Annapolis.
> 
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-- 
Bryan Whitehead
SysAdmin - JPL - Interferometry Systems and Technology
Phone: 818 354 2903
driver@jpl.nasa.gov