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README.optimization
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openssl ships optimized libraries for some cpus. The loading of these libraries depends on the ability of the dynamic linker to automaticly search additional directories depending on the cpu. If you want to find out which are these directories for your computer, run the following command: LD_LIBRARY_PATH=/usr/lib strace true 2>&1 | fgrep "open(\"/usr/lib" On a Pentium III this gives: open("/usr/lib/i686/mmx/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/lib/i686/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/lib/mmx/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory) open("/usr/lib/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory) Following is a list of cpus, library paths and possible optimizations: 486 /usr/lib/i486 -march=i486 -mcpu=i486 +asm Pentium /usr/lib/i586 -march=i586 -mcpu=i586 +asm Pentium MMX /usr/lib/i586 -march=i586 -mcpu=i586 +asm Pentium II /usr/lib/i686 -march=i686 -mcpu=i686 +asm Pentium III /usr/lib/i686 -march=i686 -mcpu=i686 +asm AMD-K6 /usr/lib/i586 -march=i586 -mcpu=i586 +asm AMD-K7 /usr/lib/i686 -march=i686 -mcpu=i686 +asm Sparc v8 /usr/lib/v8 -mcpu=v8 +asm Sparc v9 /usr/lib/v9 -mcpu=v9 -Wa,-Av8plus +asm Alpha EV4 /usr/lib/ev4 -mcpu=ev4 Alpha EV5 /usr/lib/ev5 -mcpu=ev5 +asm means that the handcrafted 586 assembler routines can be used.