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segmap_percent is set to 12% by default. Solaris 10u7(x64) / 10u8 (sparc) added Vnode Page Mapping (VPM) so vpm_cache_percent should be change instead. The default for segmap_percent was changed to 6%.
'kstat -n segmap' is a good starting point but try referencing to the following document.
SunSolve Technical Instruction
Solution 229118 : Segmap tuning for file system performance on Solaris[TM], Solaris[TM] x64