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infinitezero
n00b
Joined: 25 Oct 2004
Posts: 68
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 Posted: Sun Nov 07, 2004 12:10 am Post subject: AMD64 system |
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I have an AMD64 system, but I dont wan to use the AMD64 version. Which of the others would be the best to use with an AMD64: x86, i686, or athlon-xp?
Thanks,
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La`res
Arch/Herd Tester
Joined: 11 Aug 2003
Posts: 79
Location: ::0
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| Posted: Sun Nov 07, 2004 12:20 am Post subject: |
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For amd64, you can run x86 in 32bit mode. in terms of the best optimization for this arch in 32bit mode, Choose pentium4.
Run from a x86 install.
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infinitezero
n00b
Joined: 25 Oct 2004
Posts: 68
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| Posted: Sun Nov 07, 2004 12:25 am Post subject: |
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Thanks.
I have more question for you if you don't mind. I noticed that you have a Geforce FX 5700 256MB how is it for gaming on Gentoo, if you game? |
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Zamorate
n00b
Joined: 29 Oct 2004
Posts: 21
Location: Gasteiz
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| Posted: Sun Nov 07, 2004 12:35 am Post subject: |
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Hi!
This is my make.conf for an amd64 but in 32bits:
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CFLAGS="-O2 -march=athlon-xp -pipe -fomit-frame-pointer -ffast-math"
CHOST="i686-pc-linux-gnu"
CXXFLAGS="${CFLAGS}"
MAKEOPTS="-j2"
USE="3dnow 3dnowext mmx mmx2 sse sse2 nptl gtk gtk2 acpi alsa -apm arts cdr dvd -esd gpm kde mozilla net nls spell audiofile dvdr aalib cdparanoia java scanner samba tcltk tiff usb X qt cups gnome xvid dvdread divx4linux -xine gphoto2"
GENTOO_MIRRORS="http://gentoo.mirrors.pair.com"
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La`res, why pentium4? AMD64 isn´t like an amd-xp but with extension of 64 bits?
AGur!! |
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Swatinem
Tux's lil' helper
Joined: 27 Oct 2004
Posts: 89
Location: Bad Reicnehall, Germany
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| Posted: Sun Nov 07, 2004 11:07 am Post subject: |
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But Athlon64 has SSE2 which Athlon XP doesnt have.
I think pentium4 would enable that. |
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barry
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Joined: 01 May 2002
Posts: 170
Location: UK
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| Posted: Sun Nov 07, 2004 12:06 pm Post subject: |
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| Quote: | | in terms of the best optimization for this arch in 32bit mode, Choose pentium4. |
That would not be a good idea. Use '-march=athlon-xp -msse2' or '-march=k8' |
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La`res
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| Posted: Sun Nov 07, 2004 2:45 pm Post subject: |
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I love my GeForce for gaming. It runs every FPS I play quite smoothly.
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jthompson
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Joined: 24 Apr 2004
Posts: 159
Location: Pompano Beach, FL
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| Posted: Sat Dec 04, 2004 1:42 am Post subject: |
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Everybody has a different opinion, but I think you should stick with
| Code: | | march="athlon-xp" -m3dnow -mmmx -msse -msse2 -O3 -pipe |
The reason you do not want to use march="pentium 4" is because the pentium 4 and amd64 chips are two totally different architectures and work very differently. The old athlon xp's are more similar in architecture than a pentium 4 when it comes to amd64's.
And of course feel free to change -O3 to -O2.
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zinion
Guru
Joined: 27 Oct 2004
Posts: 541
Location: Ruhgebietshausen
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| Posted: Sat Dec 04, 2004 12:35 pm Post subject: |
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| La`res wrote: | | I love my GeForce for gaming. It runs every FPS I play quite smoothly. |
Me too....but wasn't this a little bit OT? 
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teilo
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Joined: 20 Jun 2003
Posts: 276
Location: Minneapolis, MN
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| Posted: Sat Dec 04, 2004 7:46 pm Post subject: |
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| La`res wrote: | For amd64, you can run x86 in 32bit mode. in terms of the best optimization for this arch in 32bit mode, Choose pentium4.
Run from a x86 install. |
No offense, but this is not correct. If you are compiling your system with a 32-bit version of gcc which targets i686-pc-linux-gnu by default, then you can specify march=k8 and it will then generate 32-bit code optimized for the Athlon64, along with all supported instruction sets.
I speak from experience. I had a pentium4 system up and running for about a year. I just upgraded it to an Athlon64. Before changing the motherboard, I compiled a new kernel specifically for the Athlon64 and mobo hardware - using gcc 3.4.3. I specified the Opteron/Athlon64 architechture in make menuconfig.
Everything ran perfectly this way. Please note: the kernel was compiled with a 32-bit version of gcc, generating regular i686-pc-linux-gnu code. Furthermore, I recompiled a number of packages with -march=k8, including mplayer, xine, and all the open source codecs they support. Again, everything ran perfectly: 32-bit code on a 32-bit kernel optimized for the Athlon64.
So, the short answer: Use a regular x86 2004.3 LiveCD, use the latest stable gcc-3.4.x, set -march=k8, compile your kernel specifying Opteron/Athlon64 as your subarchitecture type.
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Gentoo on AMD64
