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edudlive
Guru
Joined: 06 Jan 2004
Posts: 557
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 Posted: Mon May 31, 2004 6:40 pm Post subject: cflags for pentium m |
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I'm installing Gentoo on my Dell Inspiron 600m. I'm at the point where I'm picking my stage and I dont know which to pick.
The choices:
athlon-xp
i686
pentium3
pentium4
x86
Now I know it wont be Pentium3 or ahtlon-xp, but what do I choose for a Pentium-M?
EDIT: SEE LAST POST BY ME
Last edited by edudlive on Mon May 31, 2004 9:35 pm; edited 1 time in total |
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po0f
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Joined: 08 Apr 2004
Posts: 162
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| Posted: Mon May 31, 2004 6:54 pm Post subject: |
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i686
Intel's website says that Pentium M chips are "based on an architecture designed specifically for mobile computing." |
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edudlive
Guru
Joined: 06 Jan 2004
Posts: 557
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| Posted: Mon May 31, 2004 6:59 pm Post subject: |
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While I have a thread already, does anyone have any info or links for optimizations (in gentoo) for a Pentium-M (or even better for centrino laptops altogether)?
Especially the CFLAGS and etc in make.conf |
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nixnut
Bodhisattva
Joined: 09 Apr 2004
Posts: 10974
Location: the dutch mountains
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| Posted: Mon May 31, 2004 7:02 pm Post subject: |
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| edudlive wrote: | While I have a thread already, does anyone have any info or links for optimizations (in gentoo) for a Pentium-M (or even better for centrino laptops altogether)?
Especially the CFLAGS and etc in make.conf |
Try searching the forums. I've seen a number of threads from people that also have a dell 600m.
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po0f
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Joined: 08 Apr 2004
Posts: 162
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| Posted: Mon May 31, 2004 7:06 pm Post subject: |
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For installation, the default CFLAGS should be sufficient.
My CFLAGS:
CFLAGS="-O2 -march=i686 -fomit-frame-pointer -pipe"
Note: That is a capital O, not a zero (0).
Edit: spelling |
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edudlive
Guru
Joined: 06 Jan 2004
Posts: 557
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| Posted: Mon May 31, 2004 9:08 pm Post subject: |
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| I'm trying to customize it quite a bit, shouldn't I call it as a P-4? |
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edudlive
Guru
Joined: 06 Jan 2004
Posts: 557
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| Posted: Mon May 31, 2004 9:36 pm Post subject: |
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CFLAGS="-O2 -march=pentium3 -pipe -fomit-frame-pointer -fforce-addr -frename-registers -fprefetch-loop-arrays -falign-functions=64 -msse2"
How do those look for a Pentium-m? |
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monkey89
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Joined: 08 Mar 2004
Posts: 596
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| Posted: Mon May 31, 2004 9:43 pm Post subject: |
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| edudlive wrote: | CFLAGS="-O2 -march=pentium3 -pipe -fomit-frame-pointer -fforce-addr -frename-registers -fprefetch-loop-arrays -falign-functions=64 -msse2"
How do those look for a Pentium-m? |
Seem a little aggressive to me, and I've only seen things break with that. An -O2 -march=pentium3 -pipe -fomit-frame-pointer would probably get roughly the same performance as that with much less chance of things not compiling.
-Monkey |
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edudlive
Guru
Joined: 06 Jan 2004
Posts: 557
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| Posted: Mon May 31, 2004 9:44 pm Post subject: |
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| dont i need to add support for sse2 though? |
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rootkit
n00b
Joined: 16 Aug 2003
Posts: 50
Location: Washington, USA
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| Posted: Tue Jun 01, 2004 2:22 am Post subject: |
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If you read "man gcc" it will tell which optimizations are included at each level: -O -O1 -O2 -O3 -Os etc.
I like to read man pages in Konqueror by typing "man:gcc".  |
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cyrillic
Watchman
Joined: 19 Feb 2003
Posts: 7313
Location: Groton, Massachusetts USA
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| Posted: Tue Jun 01, 2004 2:42 am Post subject: |
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Look at
| Code: | | # cat /proc/cpuinfo |
If your CPU supports SSE2 instructions, then you can use -march=pentium4 |
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tseng
Retired Dev
Joined: 02 Aug 2003
Posts: 33
Location: York, Pa.
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| Posted: Sat Jun 19, 2004 2:45 pm Post subject: not really.. |
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The core of the Pentium-M cpu is closer to the Pentium 3 wrt timings,
P4 has a much longer pipeline. It does indeed have added sse2 instructions, howerver.
I use CFLAGS="-O2 -march=pentium3 -msse2 -fomit-frame-pointer -pipe" |
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mooerito
Apprentice
Joined: 16 Dec 2003
Posts: 187
Location: Zurich/Switzerland
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| Posted: Sat Jun 19, 2004 3:33 pm Post subject: |
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im using
| Code: | | CFLAGS="-O2 -march=pentium3 -pipe -fomit-frame-pointer -fforce-addr -frename-registers -fprefetch-loop-arrays -falign-functions=64" |
i also used -msse2 before, but then i had prolems with gtk and stuff like that, since i removed the -msse2 everything works fine egain. |
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xces
Guru
Joined: 11 Oct 2002
Posts: 515
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| Posted: Sat Jun 19, 2004 4:06 pm Post subject: |
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You should consider using GCC 3.4 when you install Gentoo the first time. It is quite stable meanwhile and I had no problems with packages which didn't compile.
GCC 3.4 supports pentium-m as architecture, which will probably give you a speedboost over pentium3 or pentium4. |
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duderonomy
Guru
Joined: 20 Mar 2004
Posts: 349
Location: SF Bay Area
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| Posted: Mon Jun 21, 2004 9:19 am Post subject: |
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Hi Folks,
As another poster mentioned, the "-On" flags are like aliases or
expansion macros representing many individual CPU optimization
flags...
My question... I have seen many reports where a particular package
did not compile because the "-fomit-frame-pointer" was used. And, IIRC,
the -O2 optimization includes the "-fomit-frame-pointer" where
necessary. (For example it may be or not be necessary in apps or
libs, I forget which)
Thoughts? |
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Installing Gentoo
