odd interrupt issues with nvidia and X

[Z.C.B.]

I have a odd situation where the according to top 50% of the
processor is going towards interupt handling. vmstat -ai shows the
nvidia device generating lots of interrupts. The interrupt issue goes
away as soon as I kill X or switch to a terminal. X also slowly
starts using up more and more CPU time.

the schedule is 4BSD with preemption...
none of the sysctl stuff for it has been changed...

Any ideas?
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