Pros and Cons of amd64 (versus i386).
Vivek Khera
vivek at khera.org
Thu Apr 6 14:09:27 UTC 2006
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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