Re: Wolk 4.9 smp cpu detection and initialization problems

Hi Marcel,

On Sun, 14 Sep 2003, Marcel de Riedmatten wrote:

> Hi Olaf
>
> I am intersted in your problems because I'll soon have similar hardware
> to play with.

Hmmm, it looks loke I am playing the testcandidate again ;-(
>
> >
> > After looking at the boot-logs and "/proc/interrupts", I have the strange
> > feeling that the wolk kernel recognizes the processors (4 in all, thanks
> > to hyperthreading), but does not initialize them correctly.
> > Deactivating hyperthreading or ACPI in the BIOS or via the kernel options
> > results in only two CPUs beeing found (the first physical ?). Only the
>
> yes both have physical id 0
>

I noticed that .....

>
> As a try to narrow the case allow me some observations:
>
>
> 1) you use a lot of laptop like config (cpufreq, acpi stuff). for smp/ht
> you just need
>
> CONFIG_ACPI=y
> CONFIG_ACPI_HT_ONLY=y
> CONFIG_ACPI_BOOT=y
>
>
> 2) you have  CONFIG_HIGHMEM64G=y which is not needed as you a 1 GB of
> ram
>
>

Right - I tried with 4GB - no change. I didn't disable the laptop/ACPI
stuff yet. The config I am using is, as far as CPU/ACPI/memmory stuff
goes, currently identical with the SuSE SMP config.

> > Hope this is enough information to track down the problem - if not, I
> >will try to provide any necessary information.
>
> if it is very unstable some oops would be ok or is it hard lock ?

Hard lock - the beasts stop dead - about 98% of the time (black screen, no
log, no console output), or every once in a while I have a reboot.  As
soon as I disable ACPI (wich happens to disable the second CPU) or the
second CPU directly the system seems to work fine (no lockup, no reboot).
I have the subtle feeling that the kernel tries to pass some
task/interrupt handler or whatever to the second/third/fourth CPU and then
gets stuck. Changing the maximum number of CPUs to more than 4 causes the
system to reboot during kernel initialization - again, without any output
on the console. The machines simply loop in that state until I press the
reset switch.


-- 
Mit freundlichen Gruessen / With kind regards,

Olaf Unterkofler


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