Emphasize that pf(4) in FreeBSD doesn't match pf(4) in
OpenBSD 4.5, but is derived from it, and got some important local changes. Wording by: cperciva
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@ -28,7 +28,7 @@
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.\"
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.\" $FreeBSD$
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.\"
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.Dd September 18 2012
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.Dd November 14, 2013
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.Dt PF 4
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.Os
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.Sh NAME
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@ -1181,5 +1181,8 @@ packet filtering mechanism first appeared in
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and then
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.Fx 5.2 .
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.Pp
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This implementation matches
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This implementation is derived from
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.Ox 4.5 .
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It has been heavily modified to be capable of running in multithreaded
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.Fx
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kernel and scale its performance on multiple CPUs.
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