Re: [gentoo-user] Generic 9686 vs. Pentium4 mcpu/march

[Rodolphe Rocca]

>> P.S.:  Also, is there difference between using the mcpu vs. march flag?
> 
> don't remember but man gcc /march explain this

Hi,

-mcpu is deprecated in 3.4.x, you would use -mtune instead.
-mtune tries not to break the compatibility with processors of the same
familly
-march will try to use the whole ABI of the processor, therefore
compatibility can be broken

If everything you compile is used on your computer, I would advice to
use -march for maximum performance.
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Re: [gentoo-user] Generic 9686 vs. Pentium4 mcpu/march

[Bastian Balthazar Bux]

Kiawud ha scritto:
I'm sure this has come up often, but I thought I'd ask it anyway
Is there a real performance difference between using a simple, generic
i686 mcpu flag as opposed to the pentium4 march/mcpu flag?
For reference, my system is a pentium 4 (obviously) with 1GB RAM.  I
use it pretty much for:
Internet surfing
no
Downloading
no
Ripping CD's (hopefully soon to rip DVD's)
yes
Watching videos (mplayer)
yes
Listening to music (xmms)
yes
Some programming (small C++, PERL scripts, maybe some JAVA)
no
Running a personal web server (apache)
no
MySQL (for the webserver ... again, personal)
no
I DON'T really use it for gaming.
where "no" means no changes "yes" means things can go better, "yes" 
doesn't mean that things will be perceptual better.

Any thoughts?
-Hani
P.S.:  Also, is there difference between using the mcpu vs. march flag?
don't remember but man gcc /march explain this
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