Eric Bishop wrote:
Have you founy any real life performance benefit of x86_64 (particularly EM64T on Xeon) as apposed to plan old x86?
Yes. On my Athlon-64 2200+ system on my desk, the 'opteron' version encodes a 6722 block sample file in 478ms; the 'i686' version does it in 514ms. The 'i386' version is somewhere near 600ms, since it has no fancy instruction scheduling.
Interestingly, _all_ of the 32-bit x86 optimized versions run just fine on that machine, meaning that GCC did not opt to use any instructions that are specific to a processor model/family... the performance improvements come only from scheduling the instruction flow.
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