In the mid 1990s through to mid 2000s - I nearly always ran SMP systems… Always Linux or Windows NT (not Win 95/98/ME)… pretty sure SMP has been part of Linux since “forever”?
Never had an issue where Linux didn’t recognize a machine with 2 physical CPU’s…
Had (still got it somewhere) an Asus Slot II motherboard - Pentium II 266 - dual booting NT4 and Slackware Linux - replaced the 266 with a pair of Celeron 466’s and it all just “worked”… I think I had to tweak Windows NT to go SMP, but not Linux.
Last machine I did physical SMP on for “home use” was a Dual Opteron with 2 x Opteron 64 (single core each) - IBM “A-Series” : it just worked as SMP without any issues…
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