On Sat, Feb 25, 2012 at 10:30:21PM +1100, Adam Carter wrote > Playing video is one of few situations in which optimisation makes a > lot of difference though, thanks to the mmx/sse stuff, which is post > i686. So a video benchmark will should show that up, but the boost may > be lost in a more general suite of weighted benchmarks.
Today's web is heavily multimedia. There are some text-oriented websites where w3m or links is sufficient, but they're few and far between. And as I mentioned earlier, the appropriate comparison is between a fully optimised system versus a fully default system, dual booting on the same machine to eliminate hardware biases. Linux works with libraries. Firefox calls a lotlibraries, which call other libraries and the kernel, too. That's why it has be the entire system being optimized. > Also, different versions of gcc optimise differently. Usually the > optimisation gets better but there a quite a few cases where > performance regresses. ??? Can you name any cases where "-march=native" is worse than than the default i686 build? And please do an apples-to-apples comparison. I.e. pgo bin versus pgo build from source. -- Walter Dnes <waltd...@waltdnes.org>
