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On Dienstag 26 Mai 2009, Stroller wrote: |
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> On 26 May 2009, at 05:37, Volker Armin Hemmann wrote: |
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> > ... |
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> > If a package would build using say 3dnow without the cpu supporting |
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> > it it will |
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> > crash with an instruction error. So either it works always or never. |
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> |
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> Hmmmn.... so if I use it my applications might crash, but it's safe to |
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> use? |
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> |
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> The mplayer ebuild is stated to be "intelligent" about ignoring these |
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> flags if necessary, so I'm not sure that "if mplayer works, so will |
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> everything else" is a safe conclusion. My question was exactly if it |
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> was so - are other ebuilds also as "intelligent" as mplayer? |
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> |
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> > Just look at /proc/cpuinfo you find everything you need to know |
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> > there. It |
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> > isn't hard. In fact, it is really ,really simple. |
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> |
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> I'd disagree. If it were really simple, Portage would take care of it |
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> automagically for me. It (apparently?) doesn't. |
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portage does not take care. mplayers build has a cpu feature autodection. |
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Different stuff. Really. |
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> |
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> It's kinda a pain to have to look up what's supported on each system, |
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> and then edit make.conf accordingly. Especially as some translation is |
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> required: Adam Carter states, 'apparently "pni" = sse3'. What else |
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> might be this or that or something else? The suggested `grep flags / |
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> proc/cpuinfo` shows "apic sep mtrr" amongst others, but there appears |
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> no USE flags corresponding to those. Or are there? |
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apic is interrupt controller. mtrr is about ram access - and supported since |
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pentium ... 1? mmx? 2? very early. There are no flags, because that stuff |
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really is nothing apps care about (with the exception of X and mtrr - luckily |
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for you, that is nothing YOU have to care about). |
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> Looks like `echo media-video/mplayer mmx mmxext sse sse2 ssse3 3dnow |
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> 3dnowext >> /etc/portage/package.use` unless someone else is able to |
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> be more informative. |
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yeah, except that is bullshit |
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no pentium can do 3dnow. Or was there a 3dnow flag in /proc/mtrr? No? Then |
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don't even touch it. Same for ssse3. This has nothing to do with sse3. It is |
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something completly different. And p4 never had this. |
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Enable mmx, mmxext, sse, sse2 for everything and you are fine. Check for pni |
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if you want sse3. Everything else is not for you. |
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look also here: |
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http://en.wikipedia.org/wiki/Pentium_4 |
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as you can see:MMX, SSE, SSE2, SSE3 but sse3 only if you have 'pni' among your |
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cpu's features. |
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