Bug 79043

Summary:	Only one CPU recognized after upgrade to 2.4.18-18.7.x
Product:	[Retired] Red Hat Linux	Reporter:	Need Real Name <stevenbalthazor>
Component:	kernel	Assignee:	Arjan van de Ven <arjanv>
Status:	CLOSED NOTABUG	QA Contact:	Brian Brock <bbrock>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	7.3
Target Milestone:	---
Target Release:	---
Hardware:	i686
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2003-02-07 04:01:00 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Need Real Name 2002-12-04 23:44:28 UTC

From Bugzilla Helper:
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 
1.0.3705)

Description of problem:
I upgraded the kernel-smp and kernel packages from 2.4.18-3 to 2.4.18-18.7.x 
and now my system boots and runs normally except only one cpu is recognized.  

How reproducible:
Always

Steps to Reproduce:
1.  Only reproducible on the one server, but everytime I reboot it only 
recognizes the 1 CPU

Actual Results:  Only 1 CPU recognized

Expected Results:  Should recognize both CPUs

Additional info:

cat /proc/cpuinfo 
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 7
model name      : Pentium III (Katmai)
stepping        : 3
cpu MHz         : 598.157
cache size      : 512 KB
Physical processor ID   : 1600417123
Number of siblings      : 1
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 mmx fxsr sse
bogomips        : 1187.96

I have a nearly identical machine (550MHz instead of 600MHz) that I upgraded 
at the same time which recognizes both CPUs.

The primary difference I notice in the boot log are these lines.
On the non-working server:
Dec  1 13:08:50 server kernel: Local APIC disabled by BIOS -- reenabling.
Dec  1 13:08:50 server keytable: Loading system font:  succeeded
Dec  1 13:08:50 server kernel: Found and enabled local APIC!

On my working server I get the following:
Dec  1 13:08:26 server kernel: Intel MultiProcessor Specification v1.4
Dec  1 13:08:26 server keytable: Loading system font:  succeeded
Dec  1 13:08:26 server kernel:     Virtual Wire compatibility mode.
Dec  1 13:08:26 server kernel: OEM ID: COMPAQ   Product ID: PROLIANT     APIC 
at: 0xFEE00000

Comment 1 Arjan van de Ven 2002-12-05 09:38:37 UTC

can you try adding "noht" to the kernel commandline (the vmlinuz line in
/boot/grub/grub.conf)

Comment 2 Need Real Name 2002-12-07 00:43:23 UTC

I added noht:
kernel /vmlinuz-2.4.18-18.7.xsmp ro root=/dev/ida/c0d0p6 
became:
kernel /vmlinuz-2.4.18-18.7.xsmp ro root=/dev/ida/c0d0p6 noht

Results were the same:
Dec  6 16:36:55 server kernel: Kernel command line: ro root=/dev/ida/c0d0p6 
noht
Dec  6 16:36:55 server kernel: Local APIC disabled by BIOS -- reenabling.
Dec  6 16:36:55 server keytable: Loading keymap:  succeeded
Dec  6 16:36:55 server kernel: Found and enabled local APIC!
Dec  6 16:36:55 server keytable: Loading system font:  succeeded
Dec  6 16:36:55 server kernel: Initializing CPU#0
Dec  6 16:36:55 server kernel: Detected 598.163 MHz processor.
Dec  6 16:36:55 server kernel: Speakup v-1.00 CVS: Tue Jun 11 14:22:53 EDT 
2002 : initialized

Comment 3 Need Real Name 2003-02-07 04:01:00 UTC

I was able to fix this problem by making a change in the bios.  My machine is 
hosted by a provider so I do not know the exact setting but in the Compaq bios 
there was a setting which needed to be set to "Linux"; my bios was set 
to "Unix" not to Linux; after setting to linux it began working.