Date: Wed, 10 Jan 2007 10:36:40 -0800 From: Garrett Cooper <youshi10@u.washington.edu> To: freebsd-questions@freebsd.org Subject: Re: make.conf and building multiple kernels and worlds Message-ID: <45A53238.9010606@u.washington.edu> In-Reply-To: <499c70c0701101027i154d4ca5x941f6b440deb6e30@mail.gmail.com> References: <1439.192.168.125.134.1168359685.squirrel@webmail.dfwlp.org> <200701101004.23651.pieter@degoeje.nl> <45A4E04C.5020902@u.washington.edu> <2831.192.168.125.134.1168443983.squirrel@webmail.dfwlp.org> <499c70c0701100846h60111c35lafea7cd0b7b402c2@mail.gmail.com> <45A52132.60303@u.washington.edu> <499c70c0701100933g395016dasf90f41ef315e7dd7@mail.gmail.com> <45A52AEA.7070008@u.washington.edu> <499c70c0701101027i154d4ca5x941f6b440deb6e30@mail.gmail.com>
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Abdullah Al-Marrie wrote: > On 1/10/07, Garrett Cooper <youshi10@u.washington.edu> wrote: >> Abdullah Al-Marrie wrote: >> > Mine is EMT64, but I use i386. >> > >> > Could you please tell me why P4 would be better for MySQL server or >> > apache? >> Crap, I can't find the article where Intel was comparing the Opterons to >> the Xeons that I was reading last night. It mentioned what the Intel >> guys used for GCC with -march on a Core 2 Duo system. >> >> However, I did find a Gentoo Wiki page where it says that safe CFLAGS / >> CPUTYPE values for EM64T CPUs is nocona: >> <http://gentoo-wiki.com/Safe_Cflags#Xeon_w.2FEM64T_.28Intel.29_.28also_Pentium_4_P6xx.29>. >> >> The only thing is that they use gcc-3.4 by default as well as gcc-4.1 / >> gcc-4.2, so processor support may be better with the later versions >> of gcc. >> >> -Garrett > > So for i386 I should use prescott, right? prescott should be a safe bet, yes. However, I don't see why nocona support couldn't be used. CPUTYPE in freebsd's make.conf is a "soft alias" to -march, which adds CPU support for the target architecture, but doesn't force the binary to only work in the target architecture IIRC. -Garrett
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