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SubjectRE: DISCONTIGMEM is deprecated
> ia64 has a such a huge number of memory model choices.  Maybe we
> need to cut it down to a small set that actually work.

SGI systems had extremely discontiguous memory (they used some high
order physical address bits in the tens/hundreds of terabyte range for the
node number ... so there would be a few GBytes of actual memory then
a huge gap before the next node had a few more Gbytes).

I don't know of anyone still booting upstream on an SN2, so if we start doing
serious hack and slash the chances are high that SN2 will be broken (if it isn't


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