Wrong number of CPU's in /proc/cpuinfo

"Döhr, Markus Hermeskeil" Markus.Doehr at siegenia-aubi.com
Fri Apr 11 16:10:40 MET DST 2003


This is due to enabled hyperthreading.


Regards,

-- 
Markus Doehr            	     SIEGENIA-AUBI KG
CCC - SAP R/3 Basis, SAPDB-DBA     Zum Grafenwald
fon: +49 6503 917 152              D-54411 Hermeskeil
fax: +49 6503 917 190              http://www.siegenia-aubi.com
 

> -----Original Message-----
> From: Oliver Butanowitz [mailto:Oliver.Butanowitz at alis.de] 
> Sent: Friday, April 11, 2003 3:05 PM
> To: linux.general at listserv.sap.com
> Subject: Wrong number of CPU's in /proc/cpuinfo
> 
> 
> Hi all,
> 
> we are running SAP Application servers on Dell-Systems.
> I realized on two new machines that the number of CPU's
> in /proc/cpuinfo isn't right.
> E.g. on a 2 CPU System /proc/cpuinfo contains the information 
> of 4 CPU's. Also top think the system has 4 CPU's.
> 
> We are running SLES7 with 2.4.18-64GB-SMP kernel.
> Any ideas why we see 4 CPU's ?
> 
> Oliver
> 
> lxapp3:~ # uname -a
> Linux lxapp3 2.4.18-64GB-SMP #1 SMP Mon Sep 2 20:28:17 GMT 
> 2002 i686 unknown lxapp3:~ # cat /proc/cpuinfo
> processor       : 0
> vendor_id       : GenuineIntel
> cpu family      : 15
> model           : 2
> model name      : Intel(R) Xeon(TM) CPU 2.00GHz
> stepping        : 7
> cpu MHz         : 1991.321
> cache size      : 512 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        : 3971.48
> 
> processor       : 1
> vendor_id       : GenuineIntel
> cpu family      : 15
> model           : 2
> model name      : Intel(R) Xeon(TM) CPU 2.00GHz
> stepping        : 7
> cpu MHz         : 1991.321
> cache size      : 512 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        : 3971.48
> 
> processor       : 2
> vendor_id       : GenuineIntel
> cpu family      : 15
> model           : 2
> model name      : Intel(R) Xeon(TM) CPU 2.00GHz
> stepping        : 7
> cpu MHz         : 1991.321
> cache size      : 512 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        : 3971.48
> 
> processor       : 3
> vendor_id       : GenuineIntel
> cpu family      : 15
> model           : 2
> model name      : Intel(R) Xeon(TM) CPU 2.00GHz
> stepping        : 7
> cpu MHz         : 1991.321
> cache size      : 512 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        : 3971.48
> 
> Output of top:
> 
> lxapp3:~ # top
> 50 processes: 49 sleeping, 1 running, 0 zombie, 0 stopped
> CPU0 states:  0.0% user,  0.0% system,  0.0% nice, 100.0% 
> idle CPU1 states:  0.0% user,  0.0% system,  0.0% nice, 
> 100.0% idle CPU2 states:  0.0% user,  0.1% system,  0.0% 
> nice, 99.0% idle CPU3 states:  0.0% user,  0.0% system,  0.0% 
> nice, 100.0% idle
> Mem:  3105544K av, 1213168K used, 1892376K free,       0K 
> shrd,  184776K buff
> Swap: 8192992K av,       0K used, 8192992K free               
>    912688K 
> cached
> 
>   PID USER     PRI  NI  SIZE  RSS SHARE STAT %CPU %MEM   TIME COMMAND
> 16098 root      15   0  1032 1028   816 R     0.9  0.0   0:00 top
>     1 root      15   0   220  220   184 S     0.0  0.0   0:04 init
>     2 root      0K   0     0    0     0 SW    0.0  0.0   0:00 
> migration_CPU0
>     3 root      0K   0     0    0     0 SW    0.0  0.0   0:00 
> migration_CPU1
>     4 root      0K   0     0    0     0 SW    0.0  0.0   0:00 
> migration_CPU2
>     5 root      0K   0     0    0     0 SW    0.0  0.0   0:00 
> migration_CPU3
>     6 root      15   0     0    0     0 SW    0.0  0.0   0:00 keventd
>     7 root      34  19     0    0     0 SWN   0.0  0.0   0:00 
> ksoftirqd_CPU0
>     8 root      34  19     0    0     0 SWN   0.0  0.0   0:00 
> ksoftirqd_CPU1
>     9 root      34  19     0    0     0 SWN   0.0  0.0   0:00 
> ksoftirqd_CPU2
>    10 root      34  19     0    0     0 SWN   0.0  0.0   0:00 
> ksoftirqd_CPU3
>    11 root      25   0     0    0     0 SW    0.0  0.0   0:00 kswapd
>    12 root      25   0     0    0     0 SW    0.0  0.0   0:00 bdflush
>    13 root      15   0     0    0     0 SW    0.0  0.0   0:05 kupdated
>    14 root      25   0     0    0     0 SW    0.0  0.0   0:00 kinoded
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