lapic_at_2k interrukts eating CPU cycles

Hello,

I recognized that doing a "make clean" in a simple ports takes minutes to 
finish, so I saw that "systat -vm" shows me about 80% system usage during 
that. But even if it's finished lapic keeps generating 2000 interrupts/sec 
and consuming 25% CPU usage when the machine is doning nothing.
Any hints what I could do? I have never seen lapic before, I just did a 
fresh 6-snapshot (june) install and upgraded to yesterdays -current.
Please find attached my kernel conf, although this time I use ULE the 
sluggish "make clean" behaviour was also with 4.2BSD (but I haven't looked 
after the CPU usage)

Thanks,

-Harry