ipfw improvements

Sepherosa Ziehau has made some improvements to ipfw in DragonFly, moving it to per-CPU state tracking among other things.  (I haven’t mentioned just ipfw in foreeeever.)

His commit message describes the improvements.  Of most interest: it reduces the performance impact of running ipfw in his tests to almost nothing.  Does this translate to ipfw on other BSDs?  I don’t know.

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Author: Justin Sherrill

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