Make flags for Intel Core 2 [SOLVED]

gauntalus · Last edited by gauntalus on Tue Aug 01, 2006 7:06 am; edited 1 time in total

I'm actually booted from my liveCD right now, I was wondering if someone could suggest some good make flags for an Intel Core 2 machine. The actual make is a Dell e1505, but all I'm really concerned with are settings I should select to get the most out of the core 2.

Suggestions?
_________________
Mike Cook Online
-- Brutal Chess

thorpe · Posted: Tue Aug 01, 2006 3:47 am Post subject:

http://gentoo-wiki.com/Safe_Cflags#Intel_Core_Solo.2FDuo_.28Yonah.29
_________________
Research before taking any advice from me. I'm still coming to grips with this myself.

gauntalus · Posted: Tue Aug 01, 2006 4:01 am Post subject:

Thanks!

_________________
Mike Cook Online
-- Brutal Chess

stupidkid · Posted: Tue Aug 01, 2006 6:14 pm Post subject:

Are you sure that's the right one? Core 2 Duo is Conroe. Core Duo (for laptops) is actually Yonah.

vonr · Guru Joined: 23 Mar 2006 Posts: 300

According to this post, Core 2 Duo is actually -march=nocona. However, the E1505 has a 'regular' Core Duo I think.

slycordinator · Advocate Joined: 31 Jan 2004 Posts: 3065 Location: Korea

gauntalus · Posted: Fri Aug 04, 2006 2:30 am Post subject:

i actually ended up using -march=prescott. Should I have used something different?
_________________
Mike Cook Online
-- Brutal Chess

stupidkid · Posted: Fri Aug 04, 2006 2:40 am Post subject:

No, that's right.
_________________
How many people can read hex if you and dead people can read hex?

gauntalus · Posted: Fri Aug 04, 2006 2:45 am Post subject:

And I had a lot of trouble finding which "Processor Family" I was supposed to choose in menuconfig. I chose pentium-m, again, is that right or should I have chosen pentium 4?
_________________
Mike Cook Online
-- Brutal Chess

mamac · l33t Joined: 29 Feb 2004 Posts: 890

Hi,

What about MAKEOPTS, did you use "-j2" or "-j3" ?
_________________
Powered by Gentoo Linux since 2003

slycordinator · Advocate Joined: 31 Jan 2004 Posts: 3065 Location: Korea

Since it's dual-core you'd use MAKEOPTS="-j3"

The "general rule" is to have it be MAKEOPTS="jX+1" where X is the number of processors. But with dual-core there are really 2 processors in one.

Though you'd obviously have to have support for SMP in your kernel and on new kernels specify the subsetting specifically for dual-core. And you'd want to make sure that when you do "cat /proc/cpuinfo" that it displays 2 CPUs that the computer sees.

Dio-Sama · n00b Joined: 18 Mar 2005 Posts: 19

Hi,

sorry for posting in a thread that's already been tagged solved, but since my question is quite similar to this one i didn't feel it's right opening a new thread just for this. so correct me if i'm wrong, but if i want to have my core 2 duo running in 32bit, i would have to put -march=prescott, and for 64bit it should be -march=nocona, would that be right? (and if they are the correct switches, i don't understand why, since prescott and nocona are netburst cores, completely different from the core/core2 architecture. so why should i be telling gcc to optimise for a processor i don't run the system on? this is a *little* confusing...)

furthermore, i read up on the icc 9.1 optimization guide from intel, but i found nothing especially for core 2 duo systems. can anybody help me with this?
i just can't decide if i should use icc or gcc for my system.

thx,
dio.
_________________
"Death is but perchance to dream."

Gregoire · Apprentice Joined: 15 Apr 2006 Posts: 292

From http://gcc.gnu.org/gcc-4.3/changes.html :

julakali · n00b Joined: 27 Mar 2006 Posts: 27

So... can i run x86 32bit with march=nocona , too?
I haven't read anything like "If you use nocona, you need a 64bit distribution..."

edit: hmm seems not... can somebody tell me the truth about that thingy, anyway?

darf · n00b Joined: 08 Jan 2007 Posts: 27

Yes, I use nocona on 32 bit works great.