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This is from maillists (names do not really matter):
[ ... some of irrelevant text skipped ... ]
> > > We really need to think about efficiency. Our 5.x performance sucks.
> > > Really sucks. We're being nickled and dimed to death by extra
> > > instructions here, there, and everywhere.
> >
> > Unfortunately 5.x attempts to run with a thread-safe kernel, and that
> > involves extra overhead to work around races that 4.x didn't even have
> > to dream about. In theory the increased performance should come from
> > increased parallelism at the cost of increased overhead. If FreeBSD
>
> No, in theory increased performance should come from increased
> parallelism with no increased overhead. Any increased overhead is a
> bug. Linux 2.4 runs a thread safe kernel with less overhead than we
> have in 4.x. Its possible.
How are we going to achieve increased paralellism w/o increased overhead?
Discounting redesigning algo's which would have been a win in the
non-parallel kernel as well. A mutex is far more expensive than an spl.
You have to protect against more things. Of course overhead is going to
go up.
> As we get closer to a stable branchpoing, and continue to suck, I'm
> starting to think we should start over.
Well, the Project is free to choose that if it wishes.
[ ... a bit more of irrelevant text skipped ... ]
Judging from theses, there seem to be some really serious problems and concerns within FreeBSD community. And frankly I don't like it. *sigh*