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

Bryan Whitehead (driver@jpl.nasa.gov)
Wed, 16 Oct 2002 16:21:44 -0700


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

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