On Thu, 8 Dec 2005, Andi Kleen wrote:
> Sorry I made a mistake here earlier. On checking the ACPI spec
> again it's valid to have distances < 20 (e.g. for a 1.5 NUMA factor
> it would be legally 15)
Saw that too.
> So better just check > LOCAL_DISTANCE, not >= 20.
For Altix 20 means that the other node is remote but in the same
enclosure / motherboard. Latency is very low in these cases. I think in
these small configurations it is better to go off node rather than using
the reclaim logic.
Other small configurations may have the same issues.
RECLAIM_DISTANCE can be set per arch if the default is not okay.
> Also a lot of Opteron BIOS get that wrong, but I'm adding some
> sanity checking now so it should work in future.
Great!
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