> Date: Fri, 9 Mar 2007 13:31:30 -0500> From: damien@ferrand.ca> > On 09/03/07 19:09 +0100, Ben Humpert wrote:> > > Date: Fri, 9 Mar 2007 12:08:25 -0500> From: dparker@utica.edu> Ben Humpert wrote:> > my dell PE 860 has a Intel DualCore Xeon with hyper-threading, my Dell > > PE 850 only has a Intel P4 with HT. On both i only see two processors > > (for sure, the dualcore has two physical core, P4 only one physical and > > one logical). Why i dontsee four cores on my DualCore? DO i need a > > special kernel-image or something?> > Are you runnning a SMP kernel?> > Try "cat /proc/cpuinfo" and see if it shows both CPUs and the number of > cores in each.> > - Dave> > > >Yes, for sure Here is what cat /proc/cpu said => http://nopaste.php-q..net/281168 (cpu cores 2)> > It looks like your CPU is as Xeon 3060. According to intel, this cpu doesn't> have hyper-threading. That's probably why you only see to processors.>
The Intel website shows wrong informations, on some sites you can see a 3,73GHz Extreme Edition in 0,90nm on some sites you only see a 3,4GHz EE in 0,90nm but there is ONLY a 3,73GHz EE in 0,90nm. I never use the Intel website, you cannot trust the informations about a CPU anymore
Check the flags /proc/cpu told ... there is a "ht" which means hyper-threading.

On 09/03/07 20:39 +0100, Ben Humpert wrote:
> The Intel website shows wrong informations, on some sites you can see a 3,73GHz Extreme Edition in 0,90nm on some sites you only see a 3,4GHz EE in 0,90nm but there is ONLY a 3,73GHz EE in 0,90nm. I never use the Intel website, you cannot trust the informations about a CPU anymore
> Check the flags /proc/cpu told ... there is a "ht" which means hyper-threading.
I agree there can be some mistakes on the intel site.

But I double-check in other places. The processor really looks like it is a
Conroe (core microarchitecture), so it really can't have hyper-threading.

Obviously something is wrong on the /proc/cpuinfo but I think it is the ht
flag.

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Damien Ferrand wrote:
> On 09/03/07 20:39 +0100, Ben Humpert wrote:
>> The Intel website shows wrong informations, on some sites you can see a 3,73GHz Extreme Edition in 0,90nm on some sites you only see a 3,4GHz EE in 0,90nm but there is ONLY a 3,73GHz EE in 0,90nm. I never use the Intel website, you cannot trust the informations about a CPU anymore
>> Check the flags /proc/cpu told ... there is a "ht" which means hyper-threading.
> I agree there can be some mistakes on the intel site.
>
> But I double-check in other places. The processor really looks like it is a
> Conroe (core microarchitecture), so it really can't have hyper-threading.
>
> Obviously something is wrong on the /proc/cpuinfo but I think it is the ht
> flag.

There may be an easy way to tell. The "Intel Inside" sticker on the
front of the server should indicate whether the processor is
hyper-threaded. I have a PowerEdge 750 here with a hyper-threaded P4,
and the sticker has a little "HT" in the upper right-hand corner.

- Dave

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Dave Parker
Utica College Department of
Integrated Information Technology Services
Data Processing Office
(315) 792-3229
Registered Linux User #408177


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David A. Parker wrote:
>
> Damien Ferrand wrote:
>> On 09/03/07 20:39 +0100, Ben Humpert wrote:
>>> The Intel website shows wrong informations, on some sites you can see
>>> a 3,73GHz Extreme Edition in 0,90nm on some sites you only see a
>>> 3,4GHz EE in 0,90nm but there is ONLY a 3,73GHz EE in 0,90nm. I never
>>> use the Intel website, you cannot trust the informations about a CPU
>>> anymore
>>> Check the flags /proc/cpu told ... there is a "ht" which means
>>> hyper-threading.
>> I agree there can be some mistakes on the intel site.
>>
>> But I double-check in other places. The processor really looks like it
>> is a
>> Conroe (core microarchitecture), so it really can't have hyper-threading.
>>
>> Obviously something is wrong on the /proc/cpuinfo but I think it is
>> the ht
>> flag.
>
> There may be an easy way to tell. The "Intel Inside" sticker on the
> front of the server should indicate whether the processor is
> hyper-threaded. I have a PowerEdge 750 here with a hyper-threaded P4,
> and the sticker has a little "HT" in the upper right-hand corner.

The more I look into this, the more I believe that your processor does
not have Hyper Threading. First, as mentioned before, is the proof
presented in Intel's comparison chart of Xeon processors:

http://www.intel.com/products/proces...chart/xeon.htm

Also, my desktop PC has an INtel Pentium D dual-core process that is
*not* hyper-threaded. However, the "ht" flag still appears:

$ cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 15
model : 4
model name : Intel(R) Pentium(R) D CPU 2.80GHz
stepping : 7
cpu MHz : 2793.154
cache size : 1024 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 2
....
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 pbe nx lm
constant_tsc pni monitor ds_cpl cid cx16 xtpr lahf_lm
bogomips : 5591.48

processor : 1
vendor_id : GenuineIntel
cpu family : 15
model : 4
model name : Intel(R) Pentium(R) D CPU 2.80GHz
stepping : 7
cpu MHz : 2793.154
cache size : 1024 KB
physical id : 0
siblings : 2
core id : 1
cpu cores : 2
....
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 pbe nx lm
constant_tsc pni monitor ds_cpl cid cx16 xtpr lahf_lm
bogomips : 5586.24

This at least proves that you can't entirely trust the flags. For
reference, my PC is running the 2.6.17-2 SMP kernel.

--

Dave Parker
Utica College Department of
Integrated Information Technology Services
Data Processing Office
(315) 792-3229
Registered Linux User #408177


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