Walter Dnes wrote: > On Fri, Feb 24, 2012 at 03:13:07AM +0200, Nikos Chantziaras wrote > >> The speed gains of building for specific submodels of CPUs might >> be there, but they're minimal. Benchmarks have shown (can't find >> the article, it was on Phoronix) that after -march=i686 you get >> diminishing returns. > > In that case, the benchmarks are useless. From my personal > experience... a fresh i686 install on a 4 and 1/2 year old Dell with > onboard Intel GPU was not able to keep up with the slowest available > speed on NHL Gamecenter Live. Ditto for 1080i TV from my HDHomerun > tuner box. After rebuilding system+world+kernel with "march=native", > it works just fine for the above tasks. I'm not the only one to see > this. See thread... > "Slow not in sync movie playing with mplayer2, ffmpeg, x264 with intel core > i5" > starting Sun, 12 Feb 2012 on this list. > > As I mentioned in that thread >> Optimizing one library may seem very minor, but it all adds up when >> you optimize every library on your system. > > To get the full benefit of optimization, you need to optimize your > entire system. The i686 code used for the install CD has to be generic > lowest-common-denominator i686 code, in order to run on every 6-year-old > i686 cpu out there. The tradeoff is that you lose the benefits of > optimisation. >
It's odd that I was thinking about your video problem when I posted my reply earlier. If using those makes no difference, why even have the option? Dale :-) :-) -- I am only responsible for what I said ... Not for what you understood or how you interpreted my words! Miss the compile output? Hint: EMERGE_DEFAULT_OPTS="--quiet-build=n"
