On Thu, 15 Mar 2007, Danny Pansters wrote:
On Thursday 15 March 2007 02:16, Gary Kline wrote:
Two quick one for kernel and/or compiler wizards: first, is
a 400Mz processor considered a 586 (for my KERNELCONF file)?
Think its 686 (but really, leaving 486 and 586 in isn't going to slow down
booting or anything!) I always say: Use GENERIC unless you have a good reason
Second, is it safe to do a buildworld with -O3? If there are
No. It's not supported if things break.
stability concerns, I'll go with the default when I rebuild my
The defaults should be fine. Also, like I said consider just using GENERIC and
load the odd kmod if needed. Generally it's less headache and equal
thanks in advance,
As Dan and Gary said -O3 isn't supported, and in many cases that "level of
optimization" gets filtered out while compiling sections of FreeBSD.
Besides, I've compiled stuff with -O3 and various optimizations in Gentoo Linux
before, and let me say that it caused a great deal of headaches... that's why I
stick with -O2 now, because it's better to have something in executable shape
and a bit slower (arguably because some optimizations slow things down) than it
is to have something run fast and break all the time.
Some food for thought :).
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