On 2010-01-21, Stan Hoeppner <s...@hardwarefreak.com> wrote:
> Roman Gelfand put forth on 1/20/2010 9:26 PM:
>> Jan 20 21:59:37 mail kernel: [ 0.000000] Linux version 2.6.26-2-686
>> (Debian 2.6.26-19lenny2) (da...@debian.org) (gcc version 4.1.3
>> 20080704 (prerelease) (Debian 4.1.2-25)) #1 SMP Wed Nov 4 20:45:37 UTC
>> 2009
>> My machine freezes every so often. I was wodering if there is any
>> clues in kernel.log exerpts below. Thanks in advance
>
> Define "freezes". Post the machine brand/model/specs.
>
>> Jan 20 21:59:37 mail kernel: [ 0.000000] SMP: Allowing 0 CPUs, 0 hotplug
>> CPUs
>> Jan 20 21:59:37 mail kernel: [ 0.000000] PERCPU: Allocating 37992
>> bytes of per cpu data
>> Jan 20 21:59:37 mail kernel: [ 0.000000] NR_CPUS: 8, nr_cpu_ids: 1
>
> This ^^ is very odd. "Allowing 0 CPUs" is very strange. Given that, this
> "NR_CPUS: 8" is even more strange.
"NR_CPUS: 8" is not a strange thing. It's the number of CPUs that the kernel
supports, not the CPUs existed in the machine.
config NR_CPUS
int "Maximum number of CPUs" if SMP && !MAXSMP
range 2 8 if SMP && X86_32 && !X86_BIGSMP
range 2 512 if SMP && !MAXSMP
default "1" if !SMP
default "4096" if MAXSMP
default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000)
default "8" if SMP
---help---
This allows you to specify the maximum number of CPUs which this
kernel will support. The maximum supported value is 512 and the
minimum value which makes sense is 2.
This is purely to save memory - each supported CPU adds
approximately eight kilobytes to the kernel image.
>
>> Jan 20 21:59:37 mail kernel: [ 0.004000] Memory: 598724k/614336k
>> available (1770k kernel code, 14940k reserved, 750k data, 244k init,
>> 0k highmem)
>
> Also very strange ^^
>
> According to that above, your system has 0 smp cpus, but it has 8 cpus, and
> only
> one of those 8 has an ID. This also says you have ~600MB of system memory.
> There is no physical combo of DIMMs that yields 600MB so we can assume you
> have
> motherboard video chip and the BIOS is assigning system RAM for the frame
> buffer. But on a modern system, why do you have so little RAM installed?
>
> Unfortunately the system information provided by kern.log is incomplete.
> Please
> post output from dmesg so we can get a more complete picture of your system.
> Your kern.log info alone is not enough to diagnose what is causing your system
> to "freeze". Something to consider is that kernel issues usually cause
> panics,
> not freezes. If your system is freezing, or "hard locking", this is usually a
> sign of:
>
> 1. A thermal issue
> 2. Defective hardware
> 3. Hardware compatibility mismatch
>
> For comparison to your kern.log, I have a two CPU system, each a single core
> CPU:
>
> Jan 20 01:59:42 greer kernel: found SMP MP-table at [c00f5b90] f5b90
> Jan 20 01:59:42 greer kernel: SMP: Allowing 2 CPUs, 0 hotplug CPUs
> Jan 20 01:59:42 greer kernel: NR_CPUS:2 nr_cpumask_bits:2 nr_cpu_ids:2
> nr_node_ids:1
>
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