Securing and Optimizing Linux: RedHat Edition -A Hands on Guide
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6.4. Benchmark results -i486

For a i486 CPU with compiler version egcs-2.91.66, the best optimization options would be: 

             CFLAGS=-O3  -funroll-all-loops -malign-double -mcpu=i486 -march=i486 -fomit-frame-pointer -fno-exceptions

Otimization chart for i486

Comparitive analysis chart with the above mentioned flags

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Benchmark results-i586UpThe bdflush parameters