如何让你的FreeBSD系统达到最优化[CPU]
一个最重要的答案就是：运行针对你cpu型号编译的程序！
我们知道，FreeBSD中大部分软件都在ports下编译。如何设定编译时的参数呢？就是/etc/make.conf这个配置文件！
打开/etc/make.conf这个文件，找到这两行：

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#CFLAGS= -O -pipe
#CXXFLAGS+= -fmemoize-lookups -fsave-memoized
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怎么改？就改CFLAGS与CXXFLAGS参数！首先把前面的“#”号去掉，然后再参照下面的表：

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CFLAGS= -march=i386 -O3 -pipe -fomit-frame-pointer
CXXFLAGS+= -march=i386 -O3 -pipe -fomit-frame-pointer

i486 (Intel)
CFLAGS= -march=i486 -O3 -pipe -fomit-frame-pointer
CXXFLAGS+= -march=i486 -O3 -pipe -fomit-frame-pointer

Pentium 1 (Intel)
CFLAGS= -march=pentium -O3 -pipe -fomit-frame-pointer
CXXFLAGS+= -march=pentium -O3 -pipe -fomit-frame-pointer

Pentium MMX (Intel)
CFLAGS= -march=pentium-mmx -O3 -pipe -fomit-frame-pointer
CXXFLAGS+= -march=pentium-mmx -O3 -pipe -fomit-frame-pointer

Pentium PRO (Intel)
CFLAGS= -march=pentiumpro -O3 -pipe -fomit-frame-pointer
CXXFLAGS+= -march=pentiumpro -O3 -pipe -fomit-frame-pointer

Pentium II (Intel)
CFLAGS= -march=pentium2 -O3 -pipe -fomit-frame-pointer
CXXFLAGS+= -march=pentium2 -O3 -pipe -fomit-frame-pointer

Celeron (Mendocino), aka Celeron1 (Intel)
CFLAGS= -march=pentium2 -O3 -pipe -fomit-frame-pointer
CXXFLAGS+= -march=pentium2 -O3 -pipe -fomit-frame-pointer

Pentium III (Intel)
CFLAGS= -march=pentium3 -O3 -pipe -fomit-frame-pointer
CXXFLAGS+= -march=pentium3 -O3 -pipe -fomit-frame-pointer

Celeron (Coppermine) aka Celeron2 (Intel)
CFLAGS= -march=pentium3 -O3 -pipe -fomit-frame-pointer
CXXFLAGS+= -march=pentium3 -O3 -pipe -fomit-frame-pointer

Celeron (Willamette?) (Intel)
CFLAGS= -march=pentium4 -O3 -pipe -fomit-frame-pointer
CXXFLAGS+= -march=pentium4 -O3 -pipe -fomit-frame-pointer

Pentium 4 (Intel)
CFLAGS= -march=pentium4 -O3 -pipe -fomit-frame-pointer
CXXFLAGS+= -march=pentium4 -O3 -pipe -fomit-frame-pointer

Eden C3/Ezra (Via)
CFLAGS= -march=i586 -m3dnow -O3 -pipe -fomit-frame-pointer
CXXFLAGS+= -march=i586 -m3dnow -O3 -pipe -fomit-frame-pointer

K6 (AMD)
CFLAGS= -march=k6 -O3 -pipe -fomit-frame-pointer
CXXFLAGS+= -march=k6 -O3 -pipe -fomit-frame-pointer

K6-2 (AMD)
CFLAGS= -march=k6-2 -O3 -pipe -fomit-frame-pointer
CXXFLAGS+= -march=k6-2 -O3 -pipe -fomit-frame-pointer

K6-3 (AMD)
CFLAGS= -march=k6-3 -O3 -pipe -fomit-frame-pointer
CXXFLAGS+= -march=k6-3 -O3 -pipe -fomit-frame-pointer

Athlon (AMD)
CFLAGS= -march=athlon -O3 -pipe -fomit-frame-pointer
CXXFLAGS+= -march=athlon -O3 -pipe -fomit-frame-pointer

Athlon-tbird, aka K7 (AMD)
CFLAGS= -march=athlon-tbird -O3 -pipe -fomit-frame-pointer
CXXFLAGS+= -march=athlon-tbird -O3 -pipe -fomit-frame-pointer

Athlon-tbird XP (AMD)
CFLAGS= -march=athlon-xp -O3 -pipe -fomit-frame-pointer
CXXFLAGS+= -march=athlon-xp -O3 -pipe -fomit-frame-pointer

Athlon 4(AMD)
CFLAGS= -march=athlon-4 -O3 -pipe -fomit-frame-pointer
CXXFLAGS+= -march=athlon-4 -O3 -pipe -fomit-frame-pointer

Athlon XP (AMD)
CFLAGS= -march=athlon-xp -O3 -pipe -fomit-frame-pointer
CXXFLAGS+= -march=athlon-xp -O3 -pipe -fomit-frame-pointer

Athlon MP (AMD)
CFLAGS= -march=athlon-mp -O3 -pipe -fomit-frame-pointer
CXXFLAGS+= -march=athlon-mp -O3 -pipe -fomit-frame-pointer
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根据你cpu的型号选择。好了，就这样。
Good luck!