Am 07.11.2015 um 19:27 schrieb drago01:
On Sat, Nov 7, 2015 at 7:23 PM, Reindl Harald
<h.reindl(a)thelounge.net> wrote:
> maybe you did not get "not that i say Fedora should go ahead and build with
> -mavx" but we talk about SSE3
Compiling 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