tech-smp: softintr running on boot CPU only?

Subject: softintr running on boot CPU only?
To: None <tech-kern@netbsd.org, tech-smp@netbsd.org>
From: Ming Lei <mlei@brocade.com>
List: tech-smp
Date: 10/03/2007 12:17:36

I am running 3.0.1 kernel on Dell SC430(two pentium cores) and run 
vmstats saw softinterrupt only on boot CPU. Is it the way that the 3.0.1 
kernel code supported to do? How about 4.0 and upcoming 5.0?

There is really not much documents on SMP/APCI implementation on x86 
besides a few email threads. Does someone know more can share with me?

Thanks
Ming