Securing and Optimizing Linux: RedHat Edition -A Hands on Guide
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6.3. Benchmark results-i586

For a Pentium CPU i586 with compiler version egcs-2.91.66, the best optimization options would be: 

             CFLAGS=-O3 -march=pentium -mcpu=pentium -ffast-math -funroll-loops -fomit-frame-pointer -fforce-mem -fforce-addr -malign-double -fno-exceptions

Otimization chart for i586

Comparitive analysis chart with the above mentioned flags

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Benchmark ResultsUpBenchmark results -i486