Am 12.02.2013 17:31, schrieb Heinz Diehl: > On 12.02.2013, Reindl Harald wrote: > >> -O3 -march=corei7 -mtune=corei7 -mmmx -msse2 -msse3 -msse4.1 -msse4.2 -maes -fopenmp -mfpmath=sse > > You can do that more easily by "-march=native" you can not do this because you can hardly deploy packages built this way on a i7-3770 (Ivy Bdrige) to a Xeon E5640 which is Westmere architecture without ending in "unknown CPU instruction" and random crashes and in the worst case this will hit you due vMotion if the host where you started a guest has the newer instructions and the target machine not - if this happen due failover you are done at all
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