Am 07.11.2015 um 19:27 schrieb drago01:
On Sat, Nov 7, 2015 at 7:23 PM, Reindl Harald <h.reindl@xxxxxxxxxxxxx> wrote:maybe you did not get "not that i say Fedora should go ahead and build with -mavx" but we talk about SSE3Compiling everything with sse3 does have a cost (dropping support for some hardware) but what does it gain us? Better performance in theory? To convince anyone you have to at least provide numbers. Otherwise the discussion is a waste of time
how do you expect to get such numbers?even if you test whatever application with -msse2 versus -msse3 mosdt parts of the operating system and the whole libraries are still built with only SSE2 support
the point is compile a single application with new features won#t gain that muc 8until you do the same with most libraries used by the software) but having the whole distribution is a summary with a completly different behavior than a single test of software xyz
if there would be no difference kernel upstream won't invest that much time for runtime-cpu-detection (look at the bootlog on different hardware)
here are examples http://www.phoronix.com/scan.php?page=news_item&px=MTU0MTY http://www.phoronix.com/scan.php?page=news_item&px=MTI1Njc
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