Bug 4530

Summary: second processor idle
Product: [Retired] Red Hat Linux Reporter: gilmore
Component: kernelAssignee: Cristian Gafton <gafton>
Status: CLOSED CURRENTRELEASE QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: 6.0CC: gilmore
Target Milestone: ---   
Target Release: ---   
Hardware: i386   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:

Description gilmore 1999-08-15 04:52:39 UTC
Hi,

We installed the SMP kernel from our RH6.0 distribution
onto A DP Pentium Pro system but it seems that only one
one processor is running user processes.

I put two shell loops into background via:

echo 'while : ; do : ; done' | sh &

and then waited for a few seconds and ran top:

21530 gilmore   17   0   804  804   680 R       0 40.6  0.3
  3:27 sh
20224 radha     20   4 92824  90M  1280 R N     0 38.3 36.0
794:13 casim_fast
21518 gilmore   15   0   804  804   680 R       0 28.8  0.3
 15:51 sh


/proc/cpuinfo reports:

processor	: 0
vendor_id	: GenuineIntel
cpu family	: 6
model		: 1
model name	: Pentium Pro
stepping	: 9
cpu MHz		: 199.434997
cache size	: 256 KB
fdiv_bug	: no
hlt_bug		: no
sep_bug		: no
f00f_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
bogomips	: 199.07

processor	: 1
vendor_id	: GenuineIntel
cpu family	: 6
model		: 1
model name	: Pentium Pro
stepping	: 9
cpu MHz		: 199.434997
cache size	: 256 KB
fdiv_bug	: no
hlt_bug		: no
sep_bug		: no
f00f_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
bogomips	: 199.07

Any idea on what could be the cause?

Thanks,

Doug Gilmore
Equator Technologies

Comment 1 Cristian Gafton 1999-08-30 01:59:59 UTC
How can you tell from that that only one processor is being used? A
process can not run on more than one CPU at once; the kernel will
load-balance the CPUs though when new processes are created.