RH 7.3, Dual Xeon 2650, 'top' and cpuinfo say I have 4 cpus!

John jcouncilman at knology.net
Wed Aug 7 08:46:01 CDT 2002


That's Hyperthreading.... Read up on it at Intel's web site.  The new
Xeons each act as two CPUs.


John

-----Original Message-----
From: linux-poweredge-admin at dell.com
[mailto:linux-poweredge-admin at dell.com] On Behalf Of Brian K. Jones
Sent: Wednesday, August 07, 2002 9:30 AM
To: 'linux-poweredge at dell.com'
Subject: RH 7.3, Dual Xeon 2650, 'top' and cpuinfo say I have 4 cpus!


W'sup with this?  Top and 'cat /proc/cpuinfo' both say I have a Quad
Xeon box!  I've opened up one of these boxes, and there are only two
cpus!  Running Redhat 7.3, software RAID 1, stock smp kernel, no crazy
apps or anything on it at this point - we're just testing them out. 
Output from the commands are below, if anyone knows that I'm parsing
this wrong or why Redhat's reporting this, PLEASE let me know!

 9:26am  up 20:09,  1 user,  load average: 0.00, 0.00, 0.00
63 processes: 62 sleeping, 1 running, 0 zombie, 0 stopped
CPU0 states:  0.0% user,  0.1% system,  0.0% nice, 99.4% idle CPU1
states:  0.0% user,  0.0% system,  0.0% nice, 100.0% idle CPU2 states:
0.0% user,  0.0% system,  0.0% nice, 100.0% idle CPU3 states:  0.0%
user,  0.0% system,  0.0% nice, 100.0% idle
Mem:  1031008K av,  316812K used,  714196K free,       0K shrd,   63264K
buff
Swap: 1534072K av,       0K used, 1534072K free                  125260K
cached





[jonesy at willy jonesy]$ cat /proc/cpuinfo
processor	: 0
vendor_id	: GenuineIntel
cpu family	: 15
model		: 2
model name	: Intel(R) XEON(TM) CPU 2.20GHz
stepping	: 4
cpu MHz		: 2187.978
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	: 4364.69

processor	: 1
vendor_id	: GenuineIntel
cpu family	: 15
model		: 2
model name	: Intel(R) XEON(TM) CPU 2.20GHz
stepping	: 4
cpu MHz		: 2187.978
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	: 4364.69

processor	: 2
vendor_id	: GenuineIntel
cpu family	: 15
model		: 2
model name	: Intel(R) XEON(TM) CPU 2.20GHz
stepping	: 4
cpu MHz		: 2187.978
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	: 4364.69

processor	: 3
vendor_id	: GenuineIntel
cpu family	: 15
model		: 2
model name	: Intel(R) XEON(TM) CPU 2.20GHz
stepping	: 4
cpu MHz		: 2187.978
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	: 4364.69


-- 

Brian K. Jones
System Administrator
Dept. of Computer Science, Princeton University jonesy at cs.princeton.edu
Voice: (609) 258-6080

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