make.conf parameters for core i7

lineMain · n00b Joined: 19 Jan 2009 Posts: 6

Hi,
where can i find detailed information about cflags parameters for i7 (march=nehalem ???, should i specifically indicate that i want 64-bit, etc...)

In Portage arch types, I should choose ia64 right?

could someone clarify these issues?

thanks in advance...

MaratIK

d2_racing · Posted: Mon Jan 19, 2009 12:22 pm Post subject:

Hi, in fact use the amd64 Stage3.

And if you want also, you should use the GCC 4.3, to have a lot of power from your CoreI7.

You are a lucky one

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lineMain · n00b Joined: 19 Jan 2009 Posts: 6

MaratIK, d2_racing, thanks for your advices...

GCC 4.3 is unstable and if I select 4.3 i can use march=native which recognizes cpu and its features, but if i compile whole system with an unstable compiles my whole system would be a little bit unstable right?

One more addition to my question, for use flags like sse sse2 ... etc. where can I find a use flag list matches this cpu's supported technologies' ?

thanks for quick answers again...

tgR10

Polynomial-C · Posted: Mon Jan 19, 2009 5:12 pm Post subject:

According to bug 245160, gcc-4.3.2 is the next stable candidate. So I'd say, you won't experience much problems with that version.
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MaratIK

Genewb · Apprentice Joined: 09 Jan 2007 Posts: 164

Would any Core i7 owners be willing to benchmark -march=core2 vs -march=barcelona (that's a request with a please

)?

This message (first reply) implies barcelona (along with appropriate SIMD switches) suits i7s better. Which wouldn't be surprising, given their architectural similarities.
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MaximeG · l33t Joined: 15 Apr 2008 Posts: 722 Location: Belgium

Hi,

Is the following cflags considered as being safe for an i7 (with an up to date gcc version) ?

coolsnowmen · Veteran Joined: 30 Jun 2004 Posts: 1479 Location: No.VA

MaximeG · l33t Joined: 15 Apr 2008 Posts: 722 Location: Belgium

Hi,

Would really a program compiled with wrong flags (ie 3dnow on intel) crashes because of this ?
I mean, don't we have some kind of protection mechanism here ?

Regards,
Maxime
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TNorthover · Posted: Tue Mar 10, 2009 2:26 pm Post subject:

fangorn · Veteran Joined: 31 Jul 2004 Posts: 1872

I had problems with wine (and vmware-player) when I compiled my whole system with gcc-4.3.3 and -march=core2 -O2 -pipe. Recompiling wine with the stable amd64 compiler did not help. Problems were resolved after recompiling every dependency with "emerge -e wine". Did not dig any further, just my experience. Problems with vmware-player were resolved out of the blue some time after recompile of wine dependencies, so I don't know if they were in some kind related. :roll:

So it's up to you. It might work for you, but you might also run into some strange error.
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MaximeG · l33t Joined: 15 Apr 2008 Posts: 722 Location: Belgium

Thanks for the feedback guys.

But I guess it's all about compiling and trying what's happening with different parameters, Science on its way :p

Regards,
Maxime
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coolsnowmen · Veteran Joined: 30 Jun 2004 Posts: 1479 Location: No.VA

azp · Posted: Thu Mar 12, 2009 1:30 am Post subject:

Hi guys

I just put together my new Intel core i7, and was checking what to do with my old amd64 environment (all the hdds have been moved into the new computer), and found that if I want to run 64 bit, I should run the amd64 install. Is it possible for me to just run my old system on the new platform?

It didn't boot because I seem to have mislabeled the hdd's, so I tried using the liveCD for Amd64 (2008.0), but sadly that didn't boot either. The kernel gets an exception after recognizing the cpu and the 8 cores. What to do, what to do? I'm currently downloading the 32 bit i686 liveCD and thought I should check with that.

I did find this by the way, perhaps somebody would like to fix/correct the wiki to say what the kind people say above. http://en.gentoo-wiki.com/wiki/Safe_Cflags/Intel#Core_i7
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minor_prophets · Apprentice Joined: 07 Oct 2007 Posts: 281

[quote="MaratIK"]

azp · Posted: Thu Mar 12, 2009 4:09 am Post subject:

I just wanted to drop by and say that it worked for me! I just needed to chroot in from the livecd (which had been booted without autoconfig and sound, etc) and rebuild the kernel with new drivers. I think I was lacking the right SATA drivers, as well as many other drivers that had changes from system to system.

Now it is actually up and running, including Xorg/Gnome etc etc. What I haven't gotten working yet is the network. I don't know why, there seems to load a driver for it (Realtek **69 is what I have) but I don't get an interface. I will have to look at it tomorrow, now it is 5 in the morning and I need to be at work as usual tomorrow!
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MaximeG · l33t Joined: 15 Apr 2008 Posts: 722 Location: Belgium

Hi,

Are you sure your network chip is a realtek one ? I'm asking this because I used to own a card (D'Link 530TX) based on a realtek chipset.
The problem is that it's true for revision A and B, but for revision C they changed their chipset for a via rhine one.

Of course, I had to find it by myself, at the expense of some hours

Another thing you may verify is that you're using the right module version (I think they are different ones for different realtek chipsets.)

Regards,
Maxime
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azp · Posted: Fri Mar 13, 2009 7:54 am Post subject:

I fixed the network, I was just making a little mistake =) I didn't try to run ifconfig -a, only ifconfig, so the card didn't show up. Since it had automatically placed itself at eth1 instead of eth0, my ifconfig eth0 up didn't work before. So everything was actually working out of the box! Really cool.

How do I move/rename a device from eth1 to eth0? I know I have seen it somewhere before, but can't remember in that file it is.

Btw, I'm playing around with MAKEOPTS"-j9" for the processer, but what is a "good" --load-average? The man pages only say "It's a float value", but doesn't state if it is in % or what is high/low. Any pointers? It is compiling at maaaagnificient speeds =)
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MaximeG · l33t Joined: 15 Apr 2008 Posts: 722 Location: Belgium

Lucky one

For the eth1 mapping to eth0, I think you can achieve it using the official documentation. It should be straight forward.

Maxime
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d2_racing · Posted: Fri Mar 13, 2009 3:43 pm Post subject:

Hi, can you post this :

azp · Posted: Sun Mar 15, 2009 10:35 pm Post subject:

Thank you for the pointer, I edited the file so it's created at eth0 instead =)
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d2_racing · Posted: Mon Mar 16, 2009 1:12 am Post subject:

No problem.
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MartyMcFly · n00b Joined: 25 Apr 2007 Posts: 25