Re: x86, amd: Get multi-node CPU info from NodeId MSR instead ofPCI config space

[Andreas Herrmann]

On Fri, Oct 16, 2009 at 03:00:00PM +0200, Ingo Molnar wrote:
> 
> * Andreas Herrmann <herrmann.der.user@xxxxxxxxxxxxxx> wrote:
> 
> > > are there any such CPUs?
> > 
> > Only Magny-Cours so far.
> > 
> > > I.e. we want to know the effect of this patch on various models of 
> > > AMD CPUs - is the change really .32 safe? Does it solve any problem 
> > > that makes it .32 material versus being for .33?
> > 
> > IMHO getting rid of the PCI config space accesses as soon as possible 
> > is a benefit, I think.
> 
> Agreed.
> 
> Is the patch an identity transformation? Or are there CPUs where the 
> information from the PCI config space is different from the MSR derived 
> one?

On production hardware it's an identity transformation.


Regards,
Andreas
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/