-mcpu=i686 vs -mcpu=pentium4

tkole · n00b Joined: 26 Sep 2003 Posts: 21

i have a stage1 install. I bootstrapped and emerged portage and system with -mcpu=i686.

The machine is a Pentium 4. Will there be noticable speed change or anything lacking?

I have yet to emerge xorg-x11, kde, gnome, etc etc etc. Should i change to -mcpu=pentium4 now?

joeljkp · Posted: Thu Jun 17, 2004 6:48 pm Post subject:

Couldn't hurt. Go for it.

tkole · n00b Joined: 26 Sep 2003 Posts: 21

whats the advantage? will i expirience a performance boost?

joeljkp · Posted: Thu Jun 17, 2004 6:51 pm Post subject:

Maybe a little bit, but probably not enough to notice, I wouldn't think. But again, why not? It just takes changing a string in make.conf.

tkole · n00b Joined: 26 Sep 2003 Posts: 21

im currently running a emerge -f *lots of packages* && emerge *lots of packages*

can i edit make.conf in the meanwhile since the system is still ONLY fetching. (hasnt begun compiling anything yet)

?

tkole · n00b Joined: 26 Sep 2003 Posts: 21

without stopping the emerging i mean.

dcstimm · Guru Joined: 19 Jun 2002 Posts: 321

tkole · n00b Joined: 26 Sep 2003 Posts: 21

so i should ctrl+c the the emerge, update make.conf, then run the same emerge command again?

Also it doesnt matter that previous stuff was compiled under i686 and new stuff will be pentium4?

sindre · Guru Joined: 01 Nov 2002 Posts: 315 Location: Norway

You should use -march=pentium4 if you have no good reason to prefer -mcpu.
I wouldn't expect the performance-increase to be noticeable though. No need to recompile everything if you don't really want to.

mat74 · Tux's lil' helper Joined: 04 Jun 2004 Posts: 88

I had the exact same make.conf settings as you. I later decided I wanted

codergeek42 · Posted: Thu Jun 17, 2004 7:47 pm Post subject:

Shouldn't this be in "Portage & Programming"?
_________________
~~ Peter: Programmer, Mathematician, STEM & Free Software Advocate, Enlightened Agent, Transhumanist, Fedora contributor
Who am I? :: EFF & FSF