Re: Opteron Nodes

On Thu, 27 Jul 2006, Vincent Hanquez wrote:

> On Thu, Jul 27, 2006 at 03:29:37PM +0200, Florian Delizy wrote:
> > Did somebody test the oM2.6 on Opteron already ? (single core, dual
> > core, or multi-processor or both) ?
>
> amd64 is the main architecture of om2.6.

I got some early boot failure with dual-core amd64.

>
> > By having a first look to the documentation of the main motherboard
> > vendor (K8SSA from
> > Tyan), I may be wrong but it seems that a particularity of the
> > multi-processor architecture
> > of the Opteron involve specific memory for certain processor, eg: you
> > have 2 processors, P1 and P2, and two memory slots groups. P1 can access
> > the first group only, but P2 can access all slots. Hence, in this
> > configuration, if a task is running on the P2 address space, only the
> > processor P2 can have access to its specific data (which also means,
> > only processor P2 can migrate this process ...).
>
> This is a normal NUMA machine. Hence the whole memory is accessible to any
> nodes. It's just that some cpu nodes got faster access to certain memory
> nodes. nothing we care really.
>
> --
> Vincent Hanquez
>
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