mtune=nocona

[Arjan van de Ven]

> Of course, on through -m64 was as expected.  I'm just a bit surprised
> that it didn't say mtune=k8 since it was definitely building on one ...
> which begs the question ... is GCC (and hence the entire x86_64
> distribution) being built this way?  What are the K8 performance
> implications?  I've seen a few things that indicate that Nocona cores
> running K8 code look pretty bad in some areas compared to optimized
> code...however, I find nothing to indicate how nocona optimized code
> runs on the K8.

AMD cpus are very good at running just about anything you throw at it
(think about it; with their marketshare... most code out there is
optimized for intel cpus so their cpus are effectively required to deal
well with such code). The reverse unfortunatly isn't the case.

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