Re: [patch] SMP alternatives

[Andi Kleen]

On Thu, Nov 24, 2005 at 11:44:59AM -0800, thockin@xxxxxxxxxx wrote:
> On Thu, Nov 24, 2005 at 08:29:53PM +0100, Andi Kleen wrote:
> > > We implemented AMD's reference algorithm, and made it work in the presence
> > > of a hardware IO hole.  It seems to work beautifully, but the last step is
> > > turning a (node:chip-select) into a (node:dimm).  Simple boards will use
> > > simple mappings, but we can't know that without board specific info.
> > > Especially with quad-rank DIMMs. :)
> > 
> > If you get something working it would be good if you could share the code
> > (even if it still needs to be tweaked) 
> 
> The below code works for us.  Note that I did not implement the
> node-interleaving parts of the AMD algorithm.  If that matters, it should
> be simple enough to do.  The BKDG has good pseudo-code.  The only thing it
> gets absolutely wrong is the IO hole.

Thanks. But without a per board DIMM mapping it's pretty useless, isn't it?

One could detect the IO hole by reading the IORR MSRs or alternatively
parsing the e820 map in /var/log/boot.msg

-Andi

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