there has been a benchmark from fefe.
http://bulk.fefe.de/scalability/

Z.

2006/7/11, Ming Lei <mlei@brocade.com>:
> Hi,
>
> I don't know anyone out there has benchmarked netbsd kernel
> performance for version from v1.5.x to v3.0 using either
> macrobenchmark or microbenchmark (e.g. lmbench), especially the
> relative performance between non-smp and smp version of the kernel.
>
> Or have we done any performance benchmark and where is the published
> data?
>
> If someone does or you have any information, please send me an email.
>
> Thanks,
> Ming
>
>