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punkid
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Joined: 18 Dec 2004
Posts: 215
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 Posted: Wed Mar 01, 2006 2:12 pm Post subject: New to Gentoo on AMD64[solved] |
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I just got a new computer which has a Sempron 64bit 3000+ CPU.
I've read the Installation Doc on AMD64.
But I still got some questions...
1.I'm planning to build the system from stage3,so could i add these codes into make.conf.
| Code: | CHOST="x86_64-pc-linux-gnu" /* is it okay to modify this line? but the official Doc says it's unrecommended to modify it from stage3 */
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-march=k8 -03 -pipe"
CXXFLAGS="${CFLAGS} -fvisibility-inlines-hidden"
LDFLAGS="-Wl,-O1"
ACCEPT_KEYWORDS="amd64" /* The whole official Doc just refers x86,but why not amd64? */
MAKEOPTS="-j2" |
2.And there's another question about the kernel
| Code: | Processor type and features --->
[ ] Intel MCE Features
[*] AMD MCE Features
Processor family (AMD-Opteron/Athlon64) --->
(*) AMD-Opteron/Athlon64 /* could I choose this option? My CPU is Sempron64,not Athlon64...or I'd choose Generix-x86-64 */
( ) Intel EM64T
( ) Generic-x86-64" |
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Last edited by punkid on Wed Mar 01, 2006 2:44 pm; edited 1 time in total |
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SinoTech
Advocate
Joined: 20 Mar 2004
Posts: 2579
Location: Neunkirchen / Saarland / Germany
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| Posted: Wed Mar 01, 2006 2:23 pm Post subject: Re: New to Gentoo on AMD64 |
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| punkid wrote: | I just got a new computer which has a Sempron 64bit 3000+ CPU.
I've read the Installation Doc on AMD64.
But I still got some questions...
1.I'm planning to build the system from stage3,so could i add these codes into make.conf.
| Code: | CHOST="x86_64-pc-linux-gnu" /* is it okay to modify this line? but the official Doc says it's unrecommended to modify it from stage3 */
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-march=k8 -03 -pipe"
CXXFLAGS="${CFLAGS} -fvisibility-inlines-hidden"
LDFLAGS="-Wl,-O1"
ACCEPT_KEYWORDS="amd64" /* The whole official Doc just refers x86,but why not amd64? */
MAKEOPTS="-j2" |
[...]
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Think you've chosen the wrong stage-3 archiv. In an stage archiv for amd64, the CHOST should be already set to "x86_64-pc-linux-gnu".
Switching the CHOST on an already installed system will cause problems (Sure there're ways to do that, but it is not recommended) since you've obviously an 32 Bit gcc, 32 Bit glibc, ... .
Also there's a amd64 installation handbook, which should refer to "amd64" as accepted keyword instead of "x86" (However on an amd64 (athlon64, ...) the "amd64" keyword is the right one for this place, doesn't matter what the handbook states).
| punkid wrote: |
[...]
2.And there's another question about the kernel
| Code: | Processor type and features --->
[ ] Intel MCE Features
[*] AMD MCE Features
Processor family (AMD-Opteron/Athlon64) --->
(*) AMD-Opteron/Athlon64 /* could I choose this option? My CPU is Sempron64,not Athlon64...or I'd choose Generix-x86-64 */
( ) Intel EM64T
( ) Generic-x86-64" |
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Not sure, but think choosing "AMD-Opteron/Athlon64" is ok for you.
Regards,
Sino
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punkid
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| Posted: Wed Mar 01, 2006 2:44 pm Post subject: |
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Really appreciate you for the help.
I guess i'm almost clear about it.
I'm planning to install the new system this weekend 
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Monkeh
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Joined: 06 Aug 2005
Posts: 1656
Location: England
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| Posted: Wed Mar 01, 2006 3:31 pm Post subject: |
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| Just one thing: Make sure it's a 64-bit Sempron. Not all of them are. |
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Nightmist
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Joined: 07 Apr 2006
Posts: 40
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| Posted: Wed Apr 12, 2006 10:19 am Post subject: CFLAGS and CXXFLAGS |
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Hello,
I am a bit unsure what CPU to specify for the CFLAGS part, and hope someone can help me out a bit. The handbook has the following:
| Code: | | CFLAGS="-march=athlon-xp -pipe -O2" # AMD64 users should use march=k8 |
I have a AMD Athlon 64 3700+ on this computer, so what should I use? I decided to install the x86 version of Gentoo, as I didn't want all the extra hassle of installing the amd64 version being new to Gentoo and all.
Hope anyone can help, thanks. |
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kfiaciarka
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Joined: 20 May 2005
Posts: 1498
Location: Dobre Miasto, Poland
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| Posted: Wed Apr 12, 2006 10:45 am Post subject: |
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You can read man gcc and decide what to put in your make.conf:) Or try this 
| Code: |
CFLAGS="-O2 -march=athlon-xp -pipe -s -fomit-frame-pointer -fforce-addr -fprefetch-loop-arrays -mfpmath=sse -msse -msse2 msse3 -mmmx -ftracer -ffast-math -m3dnow"
CXXFLAGS="$(CFLAGS) --fno-enforce-eh-specs -fvisibility-inlines-hidden"
MAKEOPTS="-j2 -s"
PORTAGE_STRIP_FLAGS="--strip-all --discard-all -R .comment -R .note -R .note.ABI-tag"
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If I were you I'd use ~amd64. With 64bits you will acheive more power:)
BTW, -march=k8 is just compiler optimalization option:)
p.s. use stage3, modify make.conf as you wish and run emerge -e system:) |
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Nightmist
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Joined: 07 Apr 2006
Posts: 40
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| Posted: Wed Apr 12, 2006 11:00 am Post subject: |
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I just skipped that part when I installed, actually. I am now up and running with this make.conf
| Code: | # These settings were set by the catalyst build script that automatically built$
# Please consult /etc/make.conf.example for a more detailed example
CFLAGS="-O2 -mtune=i686 -pipe"
CHOST="i386-pc-linux-gnu"
CXXFLAGS="-O2 -mtune=i686 -pipe"
MAKEOPTS="-j2"
USE="-gtk -gnome qt kde dvd hal alsa cdr nvidia"
GENTOO_MIRRORS="http://ftp.rhnet.is/pub/gentoo/ ftp://ftp.rhnet.is/pub/gentoo/ $
SYNC="rsync://rsync.europe.gentoo.org/gentoo-portage"
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So there is no athlon-64 option? Either athlon-xp (is that 32?) or -march=k8 ?
Yeah, but compiler optimalisation is better than nothing  |
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kfiaciarka
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Joined: 20 May 2005
Posts: 1498
Location: Dobre Miasto, Poland
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| Posted: Wed Apr 12, 2006 11:17 am Post subject: |
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| Nightmist wrote: | I just skipped that part when I installed, actually. I am now up and running with this make.conf
| Code: | # These settings were set by the catalyst build script that automatically built$
# Please consult /etc/make.conf.example for a more detailed example
CFLAGS="-O2 -mtune=i686 -pipe"
CHOST="i386-pc-linux-gnu"
CXXFLAGS="-O2 -mtune=i686 -pipe"
MAKEOPTS="-j2"
USE="-gtk -gnome qt kde dvd hal alsa cdr nvidia"
GENTOO_MIRRORS="http://ftp.rhnet.is/pub/gentoo/ ftp://ftp.rhnet.is/pub/gentoo/ $
SYNC="rsync://rsync.europe.gentoo.org/gentoo-portage"
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So there is no athlon-64 option? Either athlon-xp (is that 32?) or -march=k8 ?
Yeah, but compiler optimalisation is better than nothing |
-mtune:/ do you want to run your gentoo on other hardware? IMHO you chost should be i686 otherwise you will not gain better performance  |
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olger901
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Joined: 17 Mar 2005
Posts: 625
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| Posted: Wed Apr 12, 2006 11:26 am Post subject: |
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| Code: |
CFLAGS="-O2 -mtune=i686 -pipe"
CHOST="i386-pc-linux-gnu"
CXXFLAGS="-O2 -mtune=i686 -pipe"
MAKEOPTS="-j2"
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Above code is rather unoptimized for athlon-xp. My suggestion for your AMD Athlon 64 3700+ on x86:
| Code: |
CFLAGS="-march=athlon-xp -fomit-frame-pointer -O2 -pipe -msse2 -msse3"
CHOST="i686-pc-linux-gnu"
CXXFLAGS="${CFLAGS}"
MAKEOPTS="-j2"
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Nightmist
n00b
Joined: 07 Apr 2006
Posts: 40
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| Posted: Wed Apr 12, 2006 11:29 am Post subject: |
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| Code: | CHOST
The CHOST variable declares the target build host for your system. This variable should already be set to the correct value. Do not edit it as that might break your system. If the CHOST variable does not look correct to you, you might be using the wrong stage3 tarball. |
I didn't dare to change it after reading this in the handbook. Should I just disregard the warning and change it to 686?
Here's my new file by the way. Any more comments?
| Code: | # These settings were set by the catalyst build script that automatically built$
# Please consult /etc/make.conf.example for a more detailed example
CFLAGS="-march=athlon-xp -O2 -pipe"
CHOST="i686-pc-linux-gnu"
CXXFLAGS="${CFLAGS}"
MAKEOPTS="-j2"
USE="-gtk -gnome qt kde dvd hal alsa cdr nvidia"
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Nightmist
n00b
Joined: 07 Apr 2006
Posts: 40
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| Posted: Wed Apr 12, 2006 11:32 am Post subject: |
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| olger901 wrote: | [code]
My suggestion for your AMD Athlon 64 3700+ on x86:
[code]
CFLAGS="-march=athlon-xp -fomit-frame-pointer -O2 -pipe -msse2 -msse3"
CHOST="i686-pc-linux-gnu"
CXXFLAGS="${CFLAGS}"
MAKEOPTS="-j2"
[/code] |
Hmm, alright. I tried to figure out what the -fomit-frame-pointer and all that was, but could you give me a quick pointer?
Thanks
EDIT: Also, it seems like I installed the x86 stage 3, and not 686. What do I have to do to make all the x86 stuff 686? |
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sirdilznik
l33t
Joined: 28 Apr 2005
Posts: 731
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| Posted: Wed Apr 12, 2006 4:47 pm Post subject: |
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| Nightmist wrote: | | olger901 wrote: |
My suggestion for your AMD Athlon 64 3700+ on x86:
| Code: |
CFLAGS="-march=athlon-xp -fomit-frame-pointer -O2 -pipe -msse2 -msse3"
CHOST="i686-pc-linux-gnu"
CXXFLAGS="${CFLAGS}"
MAKEOPTS="-j2"
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Those flags seem fine you could also add -fno-ident to CFLAGS, to the best of my knowledge it's safe (no complaints here).
| Nightmist wrote: |
Hmm, alright. I tried to figure out what the -fomit-frame-pointer and all that was, but could you give me a quick pointer?
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You don't need frame pointers unless you're debugging.
| Nightmist wrote: |
EDIT: Also, it seems like I installed the x86 stage 3, and not 686. What do I have to do to make all the x86 stuff 686? |
Hmm... there's probably a faster way, but you could just run
| Code: | | emerge -e system && emerge -e system |
This will rebuild your toolchain and system libraries with the current setup in your /etc/make.conf. The second run through emerge -e system may be unnecessary, but I'd feel safer insuring some consistency with it. |
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nixnut
Bodhisattva
Joined: 09 Apr 2004
Posts: 10974
Location: the dutch mountains
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| Posted: Wed Apr 12, 2006 5:22 pm Post subject: |
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Merged above eight posts here
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Gentoo on AMD64
