Bug 4530 - second processor idle
second processor idle
Status: CLOSED CURRENTRELEASE
Product: Red Hat Linux
Classification: Retired
Component: kernel (Show other bugs)
6.0
i386 Linux
medium Severity medium
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Assigned To: Cristian Gafton
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Depends On:
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Reported: 1999-08-15 00:52 EDT by gilmore
Modified: 2008-08-01 12:22 EDT (History)
1 user (show)

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Doc Type: Bug Fix
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Description gilmore 1999-08-15 00:52:39 EDT
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 1999-08-29 21:59:59 EDT
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.

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