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> > First guess Alexey. Linux crt0.s doesnt align the stack on an eight byte
> > boundary.
> Any reason why it shouldn't? Could this simple thing case a >10%
> performance drop for some applications? If so why wasn't this noticed and
> fixed long ago?

Because its incredibly non obvious. Some of the folk doing big number
crunches noticed that the size of your environment changed the performance.
They have submitted both a fix to crt0.o and a mod to gcc to make it
align doubles on 8 byte boundaries. Im hopeful that will make gcc2.8

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