On Friday, April 06, 2012 5:19:29 pm Justin T. Gibbs wrote:
> Author: gibbs
> Date: Fri Apr  6 21:19:28 2012
> New Revision: 233961
> URL: http://svn.freebsd.org/changeset/base/233961
> 
> Log:
>   Fix interrupt load balancing regression, introduced in revision
>   222813, that left all un-pinned interrupts assigned to CPU 0.
>   
>   sys/x86/x86/intr_machdep.c:
>       In intr_shuffle_irqs(), remove CPU_SETOF() call that initialized
>       the "intr_cpus" cpuset to only contain CPU0.
>   
>       This initialization is too late and nullifies the results of calls
>       the intr_add_cpu() that occur much earlier in the boot process.
>       Since "intr_cpus" is statically initialized to the empty set, and
>       all processors, including the BSP, already add themselves to
>       "intr_cpus" no special initialization for the BSP is necessary.
>   
>   MFC after:  3 days

Ah, nice catch!

-- 
John Baldwin
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