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pyther
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Joined: 12 Jun 2008
Posts: 4
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 Posted: Thu Jun 12, 2008 6:15 pm Post subject: CFlags for Intel Atom? |
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Hello.
I was wondering if anyone knows what CFlags I might want to use with the Intel Atom Processor. I just purchased the Intel D945GCLF which has an Atom cpu.
Thanks!
EDIT: Fixed Type on Model
Last edited by pyther on Thu Jun 12, 2008 7:05 pm; edited 1 time in total |
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poly_poly-man
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Joined: 06 Dec 2006
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Location: where the heat meets the humidity...
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| Posted: Thu Jun 12, 2008 6:50 pm Post subject: |
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this?
no atom in there.... atom is a processor for handhelds - and AFAIK, it's not available anywhere yet.
What kind of processor do you really have (basically, on a livecd, cat /proc/cpuinfo)?
poly-p man
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pyther
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Joined: 12 Jun 2008
Posts: 4
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| Posted: Thu Jun 12, 2008 7:06 pm Post subject: |
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| My bad I made a huge type the motherboard is Intel D945GCLF and it does have a atom processor. |
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poly_poly-man
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| Posted: Thu Jun 12, 2008 7:24 pm Post subject: |
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can you give the contents of /proc/cpuinfo?
my guess is something like nocona, but I'm not sure what technologies this supports...
poly-p man
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I *have* fsck'ed a hard drive on my lap...
Install gentoo:
1. use sysresccd, not the livecd.
2. use funtoo stage tarballs, not the "official" ones
3. follow the handbook |
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pyther
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Joined: 12 Jun 2008
Posts: 4
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| Posted: Thu Jun 12, 2008 7:48 pm Post subject: |
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| As I just ordered the hardware today I probably won't have the system until Tuesday or Wednesday of next week so I can't get the contents until then. Sorry |
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ergobill
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Joined: 13 Jun 2008
Posts: 1
Location: Media, PA
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| Posted: Fri Jun 13, 2008 10:44 pm Post subject: Intel Atom |
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| Pyther is correct this is a new product from Intel going after VIA market. Very Low power mb with 945 chipset in mini-itx form. Ubuntu (canonical) is working on "netbook" version to take advantage of / optimize for the atom processor. |
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Hun73r
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Joined: 28 Jun 2004
Posts: 38
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| Posted: Sun Jun 15, 2008 7:07 pm Post subject: |
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| Its basic a celeron with HT so the celeron CFlags probaly work with it ant it out performance the c7 from via |
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crazycat
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Joined: 26 Aug 2003
Posts: 831
Location: Hamburg, Germany
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| Posted: Tue Jun 17, 2008 8:19 am Post subject: |
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Atom has as much in common with "celeron with ht" as a giraffe with a crocodile. The only thing in common is that they are both x86. Atom is in-order cpu. That means compiler optimizations will have much more influence on the speed of execution. Atom's performance is also pretty weak - cflags are more important for the in-order cpu. Here is a very good article about atom architecture.
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tab21
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Joined: 01 Aug 2006
Posts: 28
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| Posted: Tue Jun 17, 2008 11:30 pm Post subject: |
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I have the same board and used the following in my make.conf to install 64 bit Gentoo:
| Code: |
CFLAGS="-march=nocona -O2 -pipe -fomit-frame-pointer"
CXXFLAGS="${CFLAGS}"
MAKEOPTS="-j3"
CHOST="x86_64-pc-linux-gnu"
ALSA_CARDS="intel_hda"
INPUT_DEVICES="keyboard mouse"
VIDEO_CARDS="i810"
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I'm sure you can use -march=prescott and a 32bit stage3 tarball to get up and running as well. |
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pyther
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Joined: 12 Jun 2008
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| Posted: Thu Jun 19, 2008 9:40 pm Post subject: |
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tab21: thanks, I'll try those
My /proc/cpuinfo
| Code: |
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 28
model name : Intel(R) Atom(TM) CPU 230 @ 1.60GHz
stepping : 2
cpu MHz : 1596.084
cache size : 512 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 1
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl tm2 ssse3 cx16 xtpr lahf_lm
bogomips : 3196.02
clflush size : 64
cache_alignment : 64
address sizes : 32 bits physical, 48 bits virtual
power management:
processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 28
model name : Intel(R) Atom(TM) CPU 230 @ 1.60GHz
stepping : 2
cpu MHz : 1596.084
cache size : 512 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 1
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl tm2 ssse3 cx16 xtpr lahf_lm
bogomips : 3193.10
clflush size : 64
cache_alignment : 64
address sizes : 32 bits physical, 48 bits virtual
power management:
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wswartzendruber
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Joined: 22 Mar 2004
Posts: 377
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| Posted: Fri Jun 20, 2008 7:06 am Post subject: |
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Intel states that the Atom is ISA compliant with the Merom:
| Code: | | CFLAGS="-march=core2 -Os -fomit-frame-pointer -pipe" |
But that's only if you're using GCC 4.3.
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poly_poly-man
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| Posted: Fri Jun 20, 2008 9:25 am Post subject: |
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| wswartzendruber wrote: | Intel states that the Atom is ISA compliant with the Merom:
| Code: | | CFLAGS="-march=core2 -Os -fomit-frame-pointer -pipe" |
But that's only if you're using GCC 4.3. |
correct....
however, if:
gcc < 4.2.0, 32-bit: prescott
gcc < 4.2.0, 64-bit: nocona
gcc >= 4.2.0: native
no kidding, I just found out about march=native....I'm switching to that now 
poly-p man
_________________
I *have* fsck'ed a hard drive on my lap...
Install gentoo:
1. use sysresccd, not the livecd.
2. use funtoo stage tarballs, not the "official" ones
3. follow the handbook |
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kernelOfTruth
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Joined: 20 Dec 2005
Posts: 2933
Location: Vienna, Austria; Germany; hello world :)
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| Posted: Fri Jun 20, 2008 9:59 am Post subject: |
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| poly_poly-man wrote: | | wswartzendruber wrote: | Intel states that the Atom is ISA compliant with the Merom:
| Code: | | CFLAGS="-march=core2 -Os -fomit-frame-pointer -pipe" |
But that's only if you're using GCC 4.3. |
correct....
however, if:
gcc < 4.2.0, 32-bit: prescott
gcc < 4.2.0, 64-bit: nocona
gcc >= 4.2.0: native
no kidding, I just found out about march=native....I'm switching to that now
poly-p man |
++
use -march=native, don't use -march=core2 since it breaks several apps like xorg-server, ... (at least for me + hardened)
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wswartzendruber
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Joined: 22 Mar 2004
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Location: Camp Lejeune, NC
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| Posted: Sat Jun 21, 2008 12:16 am Post subject: |
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| kernelOfTruth wrote: | | poly_poly-man wrote: | | wswartzendruber wrote: | Intel states that the Atom is ISA compliant with the Merom:
| Code: | | CFLAGS="-march=core2 -Os -fomit-frame-pointer -pipe" |
But that's only if you're using GCC 4.3. |
correct....
however, if:
gcc < 4.2.0, 32-bit: prescott
gcc < 4.2.0, 64-bit: nocona
gcc >= 4.2.0: native
no kidding, I just found out about march=native....I'm switching to that now
poly-p man |
++
use -march=native, don't use -march=core2 since it breaks several apps like xorg-server, ... (at least for me + hardened) |
Is not march=native just going to determine that you're running a Core 2? And I've never had any problems with march=core2, but I'm not running hardened.
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Jinidog
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Location: Berlin
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| Posted: Sun Jun 29, 2008 12:12 pm Post subject: |
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Well, -march=core2 should work, but is there any evidence that it is the fastest option?
The atom is a in-order CPU. Every CPU since the Pentium-Pro was a Out-Of-Order CPU.
Somebody could do some benchmarks. I would try -march=i586 together mit the -msse -msse2 -msse3 flags.
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m0w1337
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Joined: 09 Jul 2008
Posts: 1
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| Posted: Wed Jul 09, 2008 3:40 pm Post subject: |
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Hi!
I just bought the same mainboard with the Atom on it and wondered, if you already found the right settings for this CPU to run good.
I would be very happy about an answer, because this is going to be my first attempt to install a gentoo linux, so i need every hint i can get 
Thanks
m0 |
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Cyker
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Joined: 15 Jun 2006
Posts: 964
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| Posted: Thu Jul 10, 2008 1:24 pm Post subject: |
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At the moment, there is no optimisation support for the Atom.
It's a bit tricky, but I'd guess that Pentium MMX with all the SSE flags would be the most efficient setup at the moment... |
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