interrupt oddity

[Z.C.B.]

I just installed 6.1 on a dual core amd machine. That went fine and
it was using the generic SMP kernel. I created a custom kernel using
my previous config but forgot to add the SMP line. It worked well
except for one odd thing. The nvidia card would start using up a nice
chunk of processor time with interrupts and intterupts seem to use a
lot more time in general. I added the line, recompiled, rebooted, and
every thing worked well.

Any one else ever seen any thing like this before or have any idea
what happened or why?
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