RE: 4/8 CPUs not seen in /proc/cpuinfo !

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Thx for the replay,
I have found this doc it's interseting (they talk abour Xeon i Have Xeon on the server :) )
http://www-106.ibm.com/developerworks/linux/library/l-htl/


-----Message d'origine-----
De : Benjamin J. Weiss [mailto:benjamin@xxxxxxxxxx]
Envoyé : mercredi 22 octobre 2003 14:45
À : redhat-list@xxxxxxxxxx
Objet : Re: 4/8 CPUs not seen in /proc/cpuinfo !


From: "Mohamed Kerbachi" <Mohamed.Kerbachi@xxxxxxxxxxxxx>
To: "RedHat mailling list (E-mail)" <redhat-list@xxxxxxxxxx>
Sent: Wednesday, October 22, 2003 8:16 AM
Subject: 4/8 CPUs not seen in /proc/cpuinfo !


> I have access to a server only with ssh so i can't open the box, i see a
strange think:
> In /var/log/messages
>
>
> Oct 2 1:18:52 ser cpu: 0, clocks: 998004, slice: 110889
> Oct 2 1:18:52 ser kernel: CPU0<T0:998000,T1:887104,D:7,S:110889,C:998004>
> Oct 2 1:18:52 ser kernel: cpu: 6, clocks: 998004, slice: 110889
> Oct 2 1:18:52 ser kernel: cpu: 3, clocks: 998004, slice: 110889
> Oct 2 1:18:52 ser kernel: cpu: 4, clocks: 998004, slice: 110889
> Oct 2 1:18:52 ser kernel: cpu: 1, clocks: 998004, slice: 110889
> Oct 2 1:18:52 ser kernel: cpu: 2, clocks: 998004, slice: 110889
> Oct 2 1:18:52 ser kernel: cpu: 5, clocks: 998004, slice: 110889
> Oct 2 1:18:52 ser nfslock: rpc.statd startup succeeded
> Oct 2 1:18:52 ser kernel: cpu: 7, clocks: 998004, slice: 110889
>
>
> So there is 8 Intel CPUs.
>
> But with cat /proc/cpuinfo  I see:
>
>
> processor       : 0
> vendor_id       : GenuineIntel
> cpu family      : 15
> model           : 1
> ...
> processor       : 2
> vendor_id       : GenuineIntel
> cpu family      : 15
> model           : 1
> .......
> ....
> ..
>
> processor       : 3
> vendor_id       : GenuineIntel
> cpu family      : 15
> model           : 1
>
> So only 4 CPU where are the other4 !!!!!! I AM CONFUSED !!!!!
>
> Thanks for the Help
>
>
> > Haux

They're probably hyper-threading cpu.  Intel's hyper-threading CPU's show up
as two CPU's each, as part of their performance enhancement.  Don't ask me
why, I'm not a microprocessor engineer. :)

Ben


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