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Gautam Thaker 03-26-2008 03:41 PM

2.6.24.3 SMP kernel sees only one of my 2 cores..
 
I am running Fedora Core 8 w/ all the updates installed. The kernel
version is 2.6.24.3-34.fc8 SMP. I have been using the system happily
for about 2 months. I don't know just when, but in last week, the
kernel sees only 1 of my 2 cores. I know i have run quite some time
w/ 2 cores. I am not sure if this is related to some SW update or a
bios problem (i loaded "defaults" in bios) or can the CPU actually
break and be left w/ just 1 core? I do see a msg at start up, at very
start, that says:

i8042c: can not read CTR when initializing i8042.

Can this be related to my problem? Any hints welcome, I tried lots of
google search but did not find anything related.

Gautam


[root@zadapi-L gthaker]# more /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 15
model : 107
model name : AMD Athlon(tm) 64 X2 Dual Core Processor 4000+
stepping : 1
cpu MHz : 1000.000
cache size : 512 KB
physical id : 0
siblings : 1
core id : 0
cpu cores : 1
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca
cmov pat
pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt rdtscp
lm 3dnowext
3dnow pni cx16 lahf_lm cmp_legacy svm extapic cr8_legacy misalignsse
ts fid vid
ttp tm stc 100mhzsteps
bogomips : 2010.70
clflush size : 64

THERE SHOULD BE 1 MORE PROCESSOR....!

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Roger Heflin 03-26-2008 04:07 PM

2.6.24.3 SMP kernel sees only one of my 2 cores..
 
Gautam Thaker wrote:

I am running Fedora Core 8 w/ all the updates installed. The kernel
version is 2.6.24.3-34.fc8 SMP. I have been using the system happily
for about 2 months. I don't know just when, but in last week, the
kernel sees only 1 of my 2 cores. I know i have run quite some time
w/ 2 cores. I am not sure if this is related to some SW update or a
bios problem (i loaded "defaults" in bios) or can the CPU actually
break and be left w/ just 1 core? I do see a msg at start up, at very
start, that says:

i8042c: can not read CTR when initializing i8042.

Can this be related to my problem? Any hints welcome, I tried lots of
google search but did not find anything related.

Gautam


[root@zadapi-L gthaker]# more /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 15
model : 107
model name : AMD Athlon(tm) 64 X2 Dual Core Processor 4000+
stepping : 1
cpu MHz : 1000.000
cache size : 512 KB
physical id : 0
siblings : 1
core id : 0
cpu cores : 1
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 1
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca
cmov pat
pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt rdtscp
lm 3dnowext
3dnow pni cx16 lahf_lm cmp_legacy svm extapic cr8_legacy misalignsse
ts fid vid
ttp tm stc 100mhzsteps
bogomips : 2010.70
clflush size : 64

THERE SHOULD BE 1 MORE PROCESSOR....!



Check the bios settings, someone else lost most of his cores and traced it back
to a bios setting that caused the cpus to not be seen in some version of the
kernel.


He had disabled CPUID LIMIT in the bios and cpus disappeared in some kernel
versions, see if yours is enabled or disabled.


Also a number of other bios settings will cause cpus to disappear.

Roger

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Alan Cox 03-26-2008 06:15 PM

2.6.24.3 SMP kernel sees only one of my 2 cores..
 
On Wed, 26 Mar 2008 12:41:36 -0400
Gautam Thaker <gthaker@atl.lmco.com> wrote:

> I am running Fedora Core 8 w/ all the updates installed. The kernel
> version is 2.6.24.3-34.fc8 SMP. I have been using the system happily
> for about 2 months. I don't know just when, but in last week, the
> kernel sees only 1 of my 2 cores. I know i have run quite some time
> w/ 2 cores. I am not sure if this is related to some SW update or a
> bios problem (i loaded "defaults" in bios) or can the CPU actually
> break and be left w/ just 1 core? I do see a msg at start up, at very
> start, that says:
>
> i8042c: can not read CTR when initializing i8042.

Thats a keyboard handling emulation bug in the BIOS, unrelated. Go into
the BIOS and turn off USB legacy emulation. However I don't think its
anything to do with your vanishing core

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Bruno Wolff III 03-26-2008 07:55 PM

2.6.24.3 SMP kernel sees only one of my 2 cores..
 
On Wed, Mar 26, 2008 at 19:15:26 +0000,
Alan Cox <alan@lxorguk.ukuu.org.uk> wrote:
> On Wed, 26 Mar 2008 12:41:36 -0400
> Gautam Thaker <gthaker@atl.lmco.com> wrote:
>
> > I am running Fedora Core 8 w/ all the updates installed. The kernel
> > version is 2.6.24.3-34.fc8 SMP. I have been using the system happily
> > for about 2 months. I don't know just when, but in last week, the
> > kernel sees only 1 of my 2 cores. I know i have run quite some time
> > w/ 2 cores. I am not sure if this is related to some SW update or a
> > bios problem (i loaded "defaults" in bios) or can the CPU actually
> > break and be left w/ just 1 core? I do see a msg at start up, at very
> > start, that says:
> >
> > i8042c: can not read CTR when initializing i8042.
>
> Thats a keyboard handling emulation bug in the BIOS, unrelated. Go into
> the BIOS and turn off USB legacy emulation. However I don't think its
> anything to do with your vanishing core

You might see if 431882 looks to be the same bug. If it is then you will at
least have a way to tell if things didn't work correctly early in the boot
process so that you can reboot right away.

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03-27-2008 02:02 PM

2.6.24.3 SMP kernel sees only one of my 2 cores..
 
> Gautam Thaker wrote:
>> I am running Fedora Core 8 w/ all the updates installed. The kernel
>> version is 2.6.24.3-34.fc8 SMP. I have been using the system happily
>> for about 2 months. I don't know just when, but in last week, the
>> kernel sees only 1 of my 2 cores.
>
> Check the bios settings, someone else lost most of his cores and traced it
> back
> to a bios setting that caused the cpus to not be seen in some version of
> the
> kernel.
>
> He had disabled CPUID LIMIT in the bios and cpus disappeared in some
> kernel
> versions, see if yours is enabled or disabled.
>
> Also a number of other bios settings will cause cpus to disappear.
>
> Roger

I checked the bios. It is Phoenix Award Bios V1.0.7. It does not have any
settings that I could find anything about CPUID LIMIT anywhere. Where
might it be? I went back and booted "2.6.23.15-137.fc8 #1 SMP Sun Feb 10
17:48:34 EST 2008 i686 athlon i386 GNU/Linux", which I also know was
running w/ 2 cores happily for a while, but it too shows just one core. So
it is not 2.6.23 versus 2.6.24 issue as far as I can tell. Very puzzling -
something else must have changed during the updates(?)

Gautam
>
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>


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Gautam Thaker 03-27-2008 06:57 PM

2.6.24.3 SMP kernel sees only one of my 2 cores..
 
Bruno Wolff III wrote:
> You might see if 431882 looks to be the same bug. If it is then you will at
> least have a way to tell if things didn't work correctly early in the boot
> process so that you can reboot right away.
>

I looked at my /var/log/messages and I see a "CPU 1 Not Responding". Could this indicate
that my hardware, the CPU, has actually lost one of the two cores due to some electronic
failure? (I had a Ubuntu 7.x CD laying around, i booted w/ it (but did not install
anything), and it too showed just 1 core.) May be I have a chip failure of some type?

Gautam

Mar 27 11:20:02 zadapi-L kernel: CPU 0 irqstacks, hard=c07a9000 soft=c0789000
Mar 27 11:20:02 zadapi-L kernel: PID hash table entries: 4096 (order: 12, 16384 bytes)
Mar 27 11:20:02 zadapi-L kernel: Detected 2109.586 MHz processor.
Mar 27 11:20:02 zadapi-L kernel: Console: colour VGA+ 80x25
Mar 27 11:20:02 zadapi-L kernel: console [tty0] enabled
Mar 27 11:20:02 zadapi-L kernel: Dentry cache hash table entries: 131072 (order: 7, 524288
bytes)
Mar 27 11:20:02 zadapi-L kernel: Inode-cache hash table entries: 65536 (order: 6, 262144
bytes)
Mar 27 11:20:02 zadapi-L kernel: Memory: 3044772k/3079040k available (2187k kernel code,
33064k reserved, 1118k data, 280k init, 2161536k highmem)
Mar 27 11:20:02 zadapi-L kernel: virtual kernel memory layout:
Mar 27 11:20:02 zadapi-L kernel: fixmap : 0xffc53000 - 0xfffff000 (3760 kB)
Mar 27 11:20:02 zadapi-L kernel: pkmap : 0xff800000 - 0xffc00000 (4096 kB)
Mar 27 11:20:02 zadapi-L kernel: vmalloc : 0xf8800000 - 0xff7fe000 ( 111 MB)
Mar 27 11:20:02 zadapi-L kernel: lowmem : 0xc0000000 - 0xf8000000 ( 896 MB)
Mar 27 11:20:02 zadapi-L kernel: .init : 0xc0740000 - 0xc0786000 ( 280 kB)
Mar 27 11:20:02 zadapi-L kernel: .data : 0xc0622d15 - 0xc073a544 (1118 kB)
Mar 27 11:20:02 zadapi-L kernel: .text : 0xc0400000 - 0xc0622d15 (2187 kB)
Mar 27 11:20:02 zadapi-L kernel: Checking if this processor honours the WP bit even in
supervisor mode... Ok.
Mar 27 11:20:02 zadapi-L kernel: SLUB: Genslabs=22, HWalign=64, Order=0-1, MinObjects=4,
CPUs=2, Nodes=1
Mar 27 11:20:02 zadapi-L kernel: Calibrating delay using timer specific routine.. 4222.40
BogoMIPS (lpj=2111203)
Mar 27 11:20:02 zadapi-L kernel: Security Framework v1.0.0 initialized
Mar 27 11:20:02 zadapi-L kernel: SELinux: Initializing.
Mar 27 11:20:02 zadapi-L kernel: selinux_register_security: Registering secondary module
capability
Mar 27 11:20:02 zadapi-L kernel: Capability LSM initialized as secondary
Mar 27 11:20:02 zadapi-L kernel: Mount-cache hash table entries: 512
Mar 27 11:20:02 zadapi-L kernel: CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64
bytes/line)
Mar 27 11:20:02 zadapi-L kernel: CPU: L2 Cache: 512K (64 bytes/line)
Mar 27 11:20:02 zadapi-L kernel: CPU 0(2) -> Core 0
Mar 27 11:20:02 zadapi-L kernel: Intel machine check architecture supported.
Mar 27 11:20:02 zadapi-L kernel: Intel machine check reporting enabled on CPU#0.
Mar 27 11:20:02 zadapi-L kernel: Compat vDSO mapped to ffffe000.
Mar 27 11:20:02 zadapi-L kernel: Checking 'hlt' instruction... OK.
Mar 27 11:20:02 zadapi-L kernel: SMP alternatives: switching to UP code
Mar 27 11:20:02 zadapi-L kernel: ACPI: Core revision 20070126
Mar 27 11:20:02 zadapi-L kernel: CPU0: AMD Athlon(tm) 64 X2 Dual Core Processor 4000+
stepping 01
Mar 27 11:20:02 zadapi-L kernel: SMP alternatives: switching to SMP code
Mar 27 11:20:02 zadapi-L kernel: Booting processor 1/1 eip 3000
Mar 27 11:20:02 zadapi-L kernel: CPU 1 irqstacks, hard=c07aa000 soft=c078a000
Mar 27 11:20:02 zadapi-L kernel: Not responding.
Mar 27 11:20:02 zadapi-L kernel: Inquiring remote APIC #1...
Mar 27 11:20:02 zadapi-L kernel: ... APIC #1 ID: 1000000
Mar 27 11:20:02 zadapi-L kernel: ... APIC #1 VERSION: 80050010
Mar 27 11:20:02 zadapi-L kernel: ... APIC #1 SPIV: ff
Mar 27 11:20:02 zadapi-L kernel: CPU #1 not responding - cannot use it.
Mar 27 11:20:02 zadapi-L kernel: Total of 1 processors activated (4222.40 BogoMIPS).
Mar 27 11:20:02 zadapi-L kernel: ENABLING IO-APIC IRQs
Mar 27 11:20:02 zadapi-L kernel: ..TIMER: vector=0x31 apic1=0 pin1=2 apic2=-1 pin2=-1
Mar 27 11:20:02 zadapi-L kernel: Brought up 1 CPUs

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