Re: Automatically installing an SMP kernel on AMD64 SMP machines

[Aurelien Jarno <aurelien@aurel32.net>]

Lennart Sorensen a écrit :
> On Thu, Apr 06, 2006 at 12:06:15AM +0200, Aurelien Jarno wrote:
>
> > As told to some of us on IRC, I have installed a Debian on a dual
> > dual-core Opteron machine, using the graphical installer (but the
> > problem does not look specific to it).
> >
> > The installed kernel was the k8 one, but a non-SMP kernel. Frans Pop
> > told me that's there is currently no known method to detect the number
> > of processors.
> >
> > dmidecode seems to be able to give some hints. I have attached the
> > corresponding part in the output of dmidecode. The two processors 
> > explicitly appears there, the fact that they are dual-core processors
> > is probably detectable with the line:
> >
> > 		HTT (Hyper-threading technology)
>
>
> Hyperthreading has nothing to do with dual core.  Hyperthreading is SMT
> not SMP.  It's dual thread, not dual core/processor.

I know the difference between the two, but that's actually the only 
difference in dmidecode between single-core and dual-core CPUs.

Anyway, it is advised to install SMP kernels on hyperthreading 
processors too.

> > Don't hesitate if you need some tests to be run. However, I am afraid I
> > won't be able to test a new install on this machine, as it will be used
> > soon. I could give a try with QEMU though.
>
>
> Dualcore amd's seem to need 2.6.12+ kernel to work right.  2.6.8
> apparently has issues with them.

The installer uses a 2.6.15 kernel, so this is not a problem.

Bye,
Aurelien

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