Date: Thu, 6 Apr 2006 10:09:24 -0400 From: Vivek Khera <vivek@khera.org> To: Nikolas Britton <nikolas.britton@gmail.com> Cc: freebsd-stable@freebsd.org Subject: Re: Pros and Cons of amd64 (versus i386). Message-ID: <CBC0AAB4-EC80-44C8-BCCE-010DE99D4BC0@khera.org> In-Reply-To: <ef10de9a0604052230y1efb39fdvd78ae6086e9218f7@mail.gmail.com> References: <ef10de9a0604052230y1efb39fdvd78ae6086e9218f7@mail.gmail.com>
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On Apr 6, 2006, at 1:30 AM, Nikolas Britton wrote: > $200 bucks got me a Athlon 64 3000+ Venice and a ASUS A8V Motherboard. > I'll be converting my Pentium 4 2.26GHz desktop system that has > FreeBSD 6.1-PRERELEASE i386 on it, gcc is currently set to build with > -march=pentium2 and -mtune=pentium4 via make.conf If your running a desktop, I'd recommend sticking with 32-bit. For a server doing a lot of I/O, go with 64-bit. The Athlon will run very fast in both modes, but your software compatibility is better in i386 mode. > * How do I buildworld to amd64, and should I? same as always. > * What are the best gcc -mtune / -march flags to use? i use none. however, you could set the CPU type to something more specific; see the /etc/defaults/make.conf file for your options. > * What do all the other -m flags do? read the man pages. > * What -march flags won't run on the AMD platform, will CPUTYPE=p2 > work on AMD? maybe. maybe not. probably would, but recovering from a system with broken binaries is very hard. > * Can I still build packages for other i386 (non 64-bit) systems? no. > * Where can I find more info about FreeBSD on AMD? the freebsd amd64 project page has a little. mostly there is no difference, but some drivers are not stable with large RAM which is the main reason for having 64-bit systems. > * What did I forget to add here? >
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