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On Fri, Dec 16, 2011 at 01:57:58PM +0000, James wrote |
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> Find the minimal flags and the optimum CFLAGS settings for |
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> your needs. Refine by testing. USE a fast hard drive..... |
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> Avoid apps that soak up ram. Some video apps are ram_hogs... |
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> |
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> I'd be curious to learn what you finally figure out. |
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Here's my current setup. First the cpu flags... |
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waltdnes@d530 ~ $ grep flags /proc/cpuinfo |
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flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge |
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mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx lm |
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constant_tsc arch_perfmon pebs bts aperfmperf pni dtes64 monitor ds_cpl |
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est tm2 ssse3 cx16 xtpr pdcm lahf_lm dts |
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And what I've specified in CFLAGS and USE |
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waltdnes@d530 ~ $ grep "\(CFLAGS\|USE\)" /etc/make.conf |
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CFLAGS="-O2 -march=native -mfpmath=sse -fomit-frame-pointer -pipe" |
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CXXFLAGS="${CFLAGS}" |
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USE="-* X a52 aac bzip2 cxx dga dri exif ffmpeg flac fortran gallium gif |
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intel jpeg mmx mng mp3 mpeg nptl nptlonly nsplugin offensive ogg opengl |
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png posix sse sse2 ssse3 theora threads tiff truetype vim-syntax vorbis |
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win32codecs wmf xcomposite xpm xv xvid zlib" |
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One more thing. I just ran "gcc -march=native -Q --help=target" and |
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got a major shock. It's a long output listing of what is/isn't enabled |
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with -march=native on my cpu. Here are some relevant items... |
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-march= core2 |
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-mmmx [disabled] |
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-msse [disabled] |
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-msse2 [disabled] |
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-msse3 [disabled] |
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-mssse3 [disabled] |
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It has properly identified the cpu as "core2". But mmx, sse, sse2, |
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sse3 (aka pni), and ssse3 are disabled!!! I'll change my CFLAGS to... |
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CFLAGS="-O2 -march=native -mmmx -msse -msse2 -msse3 -mssse3 -mfpmath=sse -fomit-frame-pointer -pipe" |
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...and emerge system and world and rebuild the kernel. Then I'll see |
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if it helps. It'll probably be at least an overnight job for each |
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emerge, if not longer. |
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-- |
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Walter Dnes <waltdnes@××××××××.org> |
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