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Darakian
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Joined: 31 Mar 2006
Posts: 6
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 Posted: Fri Mar 31, 2006 4:16 am Post subject: CFLAGS and Core Duo |
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After looking through what I could find on the forum and the documentation I am at a loss for what CFLAGs I should put in to the make.conf
I am tempted to put in
"-march=pentium-m"
However I am unsure of how much the core changed in the jump from dothan to yonah. Sorry if I am missing anything this is my first time installing gentoo. |
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benster
n00b
Joined: 30 Nov 2005
Posts: 67
Location: Funkytown
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| Posted: Fri Mar 31, 2006 5:19 am Post subject: |
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| Just off the top of my head I seem to remember that for a Core Duo you want to add -march=nocona to your CFLAGS. At least for the desktop version, for Centrino I don't know. |
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Keruskerfuerst
Advocate
Joined: 01 Feb 2006
Posts: 2289
Location: near Augsburg, Germany
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| Posted: Fri Mar 31, 2006 8:39 am Post subject: |
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What type of processor is Core Duo?
For desktop or for laptop use? |
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benster
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Joined: 30 Nov 2005
Posts: 67
Location: Funkytown
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| Posted: Fri Mar 31, 2006 1:58 pm Post subject: |
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It's Intel's new dual core chip.
The Magic of Google reveals a result on Intel's page:
http://www.intel.com/products/processor/coreduo/
IIRC, they're based on Pentium-M which was much more power efficient than the P4s. There are mobile and desktop versions. |
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Darakian
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Joined: 31 Mar 2006
Posts: 6
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| Posted: Sat Apr 01, 2006 3:47 am Post subject: |
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| Bingo core duo = marketing slogan for the dual core mobile chip (32-bit mind you). The cores name is Yonah. |
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robbster
n00b
Joined: 07 Apr 2006
Posts: 12
Location: Darmstadt, Germany
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| Posted: Fri Apr 07, 2006 5:07 pm Post subject: Re: CFLAGS and Core Duo |
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| Darakian wrote: |
I am tempted to put in
"-march=pentium-m"
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Just my question! Anyone a solution?  |
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digitalfrost
n00b
Joined: 08 Feb 2004
Posts: 8
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| Posted: Sun Apr 09, 2006 2:52 am Post subject: |
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I have succesfully used -march=pentium-m -msse3 on my Thinkpad T60.
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MSI K8N Neo2 Platinum 54G / Winchester 3200+ 2.5Ghz / 1GByte GSkill PC4400 275Mhz 2.5-3-3-7
IBM Thinkpad T60 2007-49G / 1.83Ghz Dual Core / 512MB PC667 / 60GB 5400rpm HDD / SXGA+ TFT |
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robbster
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Joined: 07 Apr 2006
Posts: 12
Location: Darmstadt, Germany
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| Posted: Wed Apr 12, 2006 1:26 pm Post subject: |
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| Yes, I did so, too and it seems to be stable. |
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kfiaciarka
Veteran
Joined: 20 May 2005
Posts: 1498
Location: Dobre Miasto, Poland
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| Posted: Wed Apr 12, 2006 8:45 pm Post subject: |
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Intel Core Duo (Yonah)
| Code: | CHOST="i686-pc-linux-gnu"
CFLAGS="-march=pentium-m -O2 -pipe -msse3 -fomit-frame-pointer"
CXXFLAGS="${CFLAGS}" |
according to http://gentoo-wiki.com/Safe_Cflags |
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SMoo
Tux's lil' helper
Joined: 08 Jul 2004
Posts: 140
Location: Leander, TX
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| Posted: Sat May 13, 2006 11:49 am Post subject: |
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Sorry about rehashing this, but I thought someone might want to know what I've used successfully.
My make.conf:
CFLAGS="-march=pentium-m -O2 -pipe -msse3 -fomit-frame-pointer"
CHOST="i686-pc-linux-gnu"
USE="X qt gnome nptl -kde cdr dvd alsa wireless"
CXXFLAGS="${CFLAGS}"
MAKEOPTS="-j3"
AUTOCLEAN="yes" |
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tjesis
n00b
Joined: 14 Jan 2005
Posts: 5
Location: Netherlands
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| Posted: Sat May 20, 2006 7:36 am Post subject: pentium4m ?? |
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Hi all,
I also have a Intel Centrino Duo notebook. and have used the option "-march=pentium4m" succesfully.
My make.conf looks like this:
CFLAGS="-march=pentium4m -O2 -pipe -msse3"
CHOST="i686-pc-linux-gnu"
CXXFLAGS="${CFLAGS}"
MAKEOPTS="-j2"
Right now I'm in doubt which '-march' flag I should use.
Can somebody help me to clear things up?
Thanx!
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SMoo
Tux's lil' helper
Joined: 08 Jul 2004
Posts: 140
Location: Leander, TX
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| Posted: Sat May 20, 2006 1:23 pm Post subject: |
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You should use -j3 so that Gentoo will make use of both CPUs... |
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tjesis
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Joined: 14 Jan 2005
Posts: 5
Location: Netherlands
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| Posted: Tue May 23, 2006 4:21 pm Post subject: |
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| SMoo wrote: |
You should use -j3 so that Gentoo will make use of both CPUs... |
Thanx!!!!
I changed the /etc/make.conf to reflect MAKEOPTS="-j3"
_________________
Asus M2N-E, Athlon64 X2 3800+, 4Gb DDR2 667Mhz
1x SATA2 160Gb, 2x SATA2 80Gb in RAID0, 1x SATA 300Gb |
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bssteph
l33t
Joined: 26 Feb 2003
Posts: 652
Location: Wisconsin
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| Posted: Sat Jun 03, 2006 4:28 pm Post subject: Re: pentium4m ?? |
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| tjesis wrote: | Hi all,
I also have a Intel Centrino Duo notebook. and have used the option "-march=pentium4m" succesfully.
My make.conf looks like this:
CFLAGS="-march=pentium4m -O2 -pipe -msse3"
CHOST="i686-pc-linux-gnu"
CXXFLAGS="${CFLAGS}"
MAKEOPTS="-j2"
Right now I'm in doubt which '-march' flag I should use.
Can somebody help me to clear things up?
Thanx! |
I'm not certain, but I'm pretty sure that "pentium4m" means the Pentium 4 M, which was just a standard P4 with SpeedStep (and, if the laptop I used to have is any indication, pretty cruddy SpeedStep at that). It predates the Pentium M line. You probably want to use pentium-m. I'm not sure if there's any difference as far as GCC is concerned though. |
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rhill
Retired Dev
Joined: 22 Oct 2004
Posts: 1629
Location: sk.ca
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| Posted: Sat Jun 03, 2006 9:15 pm Post subject: |
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no, Core Duo is -march=prescott. it supports Prescott New Instructions but not EM64T.
pentium-m sets the architecture to Pentium Pro with support for MMX, SSE, and SSE2.
pentium4 sets the architecture to Pentium 4 with support for MMX, SSE, and SSE2.
pentium-4m is identical to pentium4. there is no difference whatsoever.
prescott sets the architecture to Nocona with support for MMX, SSE, SSE2, and SSE3.
nocona sets the architecture to Nocona with support for MMX, SSE, SSE2, SSE3, and EM64T.
Core Solo is -march=prescott. Core Duo is -march=prescott. Pentium D is -march=nocona. Core Solo/Duo 2 will be -march=nocona but also have SSE4 (mni) support. basically if you have pni in /proc/cpuinfo, use prescott. if you have pni and lm in /proc/cpuinfo, use nocona.
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P.Kosunen
Guru
Joined: 21 Nov 2005
Posts: 309
Location: Finland
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| Posted: Sun Jun 04, 2006 4:40 pm Post subject: |
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| Code: |
vendor_id : GenuineIntel
cpu family : 6
model : 14
model name : Genuine Intel(R) CPU T2300 @ 1.66GHz
stepping : 8
cpu MHz : 1660.000
cache size : 2048 KB
physical id : 0
siblings : 2
core id : 1
cpu cores : 2
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
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 nx constant_tsc pni monitor vmx est tm2 xtpr
bogomips : 3333.62
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No sse3 here, are you sure prescott is correct? |
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htranou
Tux's lil' helper
Joined: 08 May 2006
Posts: 96
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| Posted: Sun Jun 04, 2006 5:27 pm Post subject: |
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pni = sse3
Prescott New instructions I think. Kernel people named it pni before marketing from Intel called it SSE3, and they decided not to change it. |
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drsound
n00b
Joined: 20 Sep 2004
Posts: 10
Location: Italy
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| Posted: Sat Jul 01, 2006 2:58 pm Post subject: |
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And what about kernel optimizations? I have an Intel Yonah dual core CPU (T2500): what should I choose as Processor type and features
/ Processor family? Pentium-4/Celeron(P4-based)/Pentium-4 M/Xeon or Pentium M?
Moreover, is the dual core technically an hyperthreading or not? If so, should I choose SMT (Hyperthreading) scheduler support? |
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slashdevslashtty
Tux's lil' helper
Joined: 29 Aug 2004
Posts: 119
Location: 97219
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| Posted: Sun Jul 02, 2006 6:35 am Post subject: |
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| drsound wrote: | | Moreover, is the dual core technically an hyperthreading or not? If so, should I choose SMT (Hyperthreading) scheduler support? |
Not hyperthreading. Just make sure SMP is enabled. |
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scahrossar
n00b
Joined: 17 Mar 2005
Posts: 2
Location: Norway
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| Posted: Sun Jul 09, 2006 2:16 pm Post subject: Confusing ... |
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From the GCC-manual:
pentium-m: Low power version of Intel Pentium3 CPU with MMX, SSE and SSE2 instruction set support. Used by Centrino notebooks.
prescott: Improved version of Intel Pentium4 CPU with MMX, SSE, SSE2 and SSE3 instruction set support.
Allright. The Prescott is a Pentium 4 CPU, the Core Duo is a Pentium-M.
"cat /proc/cpuinfo" reveals that it's related to the models in family 6(check out http://sandpile.org/ia32/cpuid.html to see all models in that family). In some way, it means, that the Core Duo(Yonah) actually is a modified Pentium 3 with SSE3/pni support. The closest GCC match is "-march=prescott", simply because it has support for SSE3/pni instruction set. However the system will then be optimized for a Pentium 4, which is a 7th Generation(80786) processor. It just have to be wrong. It seems a lot more logically to optimize for Pentium M(P3) with SSE3/pni support. What about these CFLAGS ?
| Code: |
CFLAGS="-march=pentium-m -O2 -pipe -fomit-frame-pointer -mfpmath=sse -msse3"
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rhill
Retired Dev
Joined: 22 Oct 2004
Posts: 1629
Location: sk.ca
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| Posted: Mon Jul 10, 2006 5:10 am Post subject: Re: Confusing ... |
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| scahrossar wrote: | "cat /proc/cpuinfo" reveals that it's related to the models in family 6(check out http://sandpile.org/ia32/cpuid.html to see all models in that family). In some way, it means, that the Core Duo(Yonah) actually is a modified Pentium 3 with SSE3/pni support. The closest GCC match is "-march=prescott", simply because it has support for SSE3/pni instruction set. However the system will then be optimized for a Pentium 4, which is a 7th Generation(80786) processor. It just have to be wrong. It seems a lot more logically to optimize for Pentium M(P3) with SSE3/pni support. What about these CFLAGS ?
| Code: |
CFLAGS="-march=pentium-m -O2 -pipe -fomit-frame-pointer -mfpmath=sse -msse3"
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You're right that the Core Duo is based on the Pentium-M microarch, but it's had some major updates done to it. Fex, the SSE front and backend are completely redone. On the P-M, it took twice as long to decode SSE than X87. Core can handle up to three packed and micro-op SSE instructions at once, making using SSE the advantage. However, when you set -march=pentium-m, GCC prefers to generate x87 instructions.
There's other changes that make Core more similar to Netburst than P-M when it comes to cost calculation, prefetch block size, etc., all of which are dependent on -march. Check out gcc/config/i386/i386.c and the IA32 Intel Architecture Optimization Reference Manual.
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pactoo
Guru
Joined: 18 Jul 2004
Posts: 553
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| Posted: Mon Jul 10, 2006 2:08 pm Post subject: |
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| If prescottt is to prefer over pentium-m for cflags, what should I choose then for the kernel config? pentium-4 or still pentium-m? And does it make sense to also activate "check for P4 thermal throttling support" with core duo? |
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rhill
Retired Dev
Joined: 22 Oct 2004
Posts: 1629
Location: sk.ca
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| Posted: Sat Jul 15, 2006 3:40 am Post subject: |
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| pactoo wrote: | | If prescottt is to prefer over pentium-m for cflags, what should I choose then for the kernel config? pentium-4 or still pentium-m? And does it make sense to also activate "check for P4 thermal throttling support" with core duo? |
I'd choose pentium-4.
Core Solo/Duo supports both types of thermal monitoring, T1 and T2, preferring T2. See http://www.hardwaresecrets.com/article.php?cat=&id=104 for a quick explanation of what that means.
Ref: http://www.intel.com/design/mobile/datashts/309221.htm (Sec 2.2)
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ph03n1x
l33t
Joined: 06 Feb 2003
Posts: 756
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| Posted: Sun Jul 30, 2006 5:50 pm Post subject: |
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Thx for all the infos guys  |
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Daemonax
Apprentice
Joined: 30 Apr 2004
Posts: 211
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| Posted: Sat Aug 12, 2006 6:44 am Post subject: |
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This is great.
Thanks for all the info, looking at getting a core duo laptop this week, so I'll set cflags to prescott and the internal kernel processor option to Pentium-4 from what I can tell?
Hurray, looking forward to getting back in to Gentoo.
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