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On Mon, 2006-12-18 at 10:58 +0300, Andrew Gaydenko wrote: |
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> Statux, |
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> |
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> Thanks! |
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> |
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> ======= On Monday 18 December 2006 02:44, Statux wrote: ======= |
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> ... |
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> >If you want to use EM64T, it's amd64 and -march=nocona in the CFLAGS. |
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> |
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> But If I don't want to use EMT64 but have CPU with EM64T (say, it is |
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> Pentium D) - am I forced to use 'amd64' artch? Or - can I use 'x86' with |
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> such 64-bit CPU? - all will work as "normal" 32-bit system, when |
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> '-march=prescott' is selected. Is it so? And as for, say, Pentium D 925, |
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> it has 'Presler' cores rather 'Prescott-2M' for Pentium4 630. |
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Quoted from the Gentoo Wiki: |
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Pentium D 8xx / 9xx |
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vendor_id : GenuineIntel |
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cpu family : 15 |
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model : 4 |
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model name : Intel(R) Pentium(R) D CPU x.xxGHz |
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cpu cores : 2 |
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Note: Because of the EM64T support, the Gentoo architecture for this |
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chip is amd64. Warning: With this processor mysql 5 is completely broken |
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using -march=amd64. Make sure you use -march=nocona. TODO: Could |
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somebody please check the 9xx cpuinfo is identical to the 8xx cpuinfo? |
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Append: my 9xx registers model 6 not model 4. It also has syscall |
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instead of pbe. It has constant_tsc and lahf_lm. It's missing est. |
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Note: For those who don't need the Intel's 64-bit extension(EM64T), just |
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use the Pentium4(Prescott) flags with MAKEOPTS="-j3" which is on desktop |
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in most of the cases the better choice *and* use |
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CHOST="i686-pc-linux-gnu" (for a strictly 32-bit environment). |
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CHOST="x86_64-pc-linux-gnu" |
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CFLAGS="-march=nocona -O2 -pipe" |
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CXXFLAGS="${CFLAGS}" |
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MAKEOPTS="-j3" |
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|
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--- |
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However, I had always been told to not use x86_64 (CHOST) unless it was |
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an Itanium. (Can anyone else add to this?). |
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EM64T should always use nocona in the CFLAGS for 64bit. |
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Anyway, make sure you pick the correct install/live cd during install. |
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x86 for 32bit and amd64 for 64bit (or even x86_64 if that will end up |
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being your CHOST but I'd stick with amd64 and not use anything x86_64, |
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personally, as you don't have an Itanium). |
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> Sorry for these question - I have tried to dig in the problem, but all |
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> silently suppose I must already know something :-) |
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> |
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> |
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> Andrew |
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-- |
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Statux <statux@×××××××××.net> |
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