On Thu, 2008-01-03 at 00:14 +1000, Alan E. Davis wrote: > I have been running a machine for a long while. I am beginning to > think that the old saw that Gentoo isn't release oriented is hogwash: > each installation seems to be more polished, leaving behind a windrove > of cruft accumlating over the years. The few times I have installed > since my introduction two years ago have each exposed some more > polished installation aspects/details. > > Be that as it may, I have now installed a new motherboard and CPU. I > have moved from a 64 bit AMD single core Athlon 64 to a dual core AMD > Athlon 64. The install has gone well, I have had to recompile the > kernel before migrating; however, some questions remain. > > So it's back to the old threads about whether 64 bits is superior to > 32, etc. My question now is, given that the system is working damned > well now, what is the best way to handle this: recompile everything? > Should I recompile gcc and the libraries and all compilers. > > I have to say that this system is pretty solid, but it's been hard to > keep up with the housekeeping. And emerge -uDav world has been next > to impossible. > > So, again, what differences will there be, that will require immediate > adjustment? I have changed to "-j3" in make.conf. I have so many > packages installed it will take many days to recompile, and, again, I > am considering a reinstallation of everything. Gentoo has cured me of > that weakness for constant upgrades and installs, even while > convincing me of the excellence of compiling for the machine.
I don't think you have to recompile everything. AMD64 and AMD64 X2 share the same -march setting. All that might need to be done is adding -msse3 to your CFLAGS, because the first generations of AMD64 didn't have that feature and thus it's not included in -march=k8. However, this flag should only influence multimedia apps and encoders like mplayer, vlc or ogmtools (and their direct deps).
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