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Hi Walter, |
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On Jan 27, 2008 3:55 PM, Walter Dnes <waltdnes@××××××××.org> wrote: |
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> On Sat, Jan 26, 2008 at 07:39:47PM +0900, Mike Mazur wrote |
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> |
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> > CFLAGS="-march=prescott -O2 -pipe -fomit-frame-pointer" |
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> |
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> The -march option may or may not invoke mmx, sse, sse2, etc in the |
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> CFLAGS line but it definitely does *NOT* invoke them in the USE variable. |
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> |
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> > USE="gtk gtk2 gnome -apm -eds -emboss -gstreamer -qt -qt3 -qt4 -kde |
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> > -ldap -arts -esd -oss -xv X a52 aac acpi alsa avahi bash-completion |
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> > bluetooth cdr cjk crypt dbus dvd dvdr exif firefox gphoto hal ipod |
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> > jpeg mbox mp3 nptl nptlonly ogg opengl png pulseaudio spell ssl |
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> > startup-notification svg theora tiff vorbis wifi xinerama" |
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> |
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> I have mmx, sse, sse2, and a few AMD-specific options in my USE |
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> variable. Can you show us the output of the command... |
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> |
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> grep flags /proc/cpuinfo |
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|
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The output of `grep flags /proc/cpuinfo` is: |
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|
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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 |
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lm constant_tsc arch_perfmon pebs bts pni monitor ds_cpl vmx est tm2 |
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ssse3 cx16 xtpr lahf_lm |
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|
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> Then we can see what to add. If you are *NOT* taking advantage of the |
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> available extensions, you won't get the available oomph out of your cpu. |
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> It's not so much a matter of raw speed as ability to do complex |
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> calculations in the chipset microcode, rather than painfully emulating |
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> it in software. One of the features of Gentoo is customizing your build |
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> to get the most out of your cpu. Use it... within reason. |
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This enters a realm I haven't visited before... |
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Makes lots of sense. I guess I'll need to recompile everything if I |
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want any changes to come into effect? |
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> mplayer also takes a few custom flags. In /etc/portage/package.use I |
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> have the entry |
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> |
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> media-video/mplayer custom-cflags i8x0 real 3dnowext mmxext |
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> |
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> With an Intel cpu, you obviously don't want "3dnowext", but there may |
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> be other stuff worth using. To find out what's available, use... |
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> |
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> grep mplayer /usr/portage/profiles/use.local.desc | less |
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Looks like I have lots of reading ahead of me :) Need to figure out |
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what those CPU extensions mean or do and how not to abuse that power! |
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Thanks a lot, |
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Mike |
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-- |
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