On Wed, Aug 05, 2009 at 10:54:07AM +0100, David Southwell wrote: > I have found http://docs.freebsd.org/info/gcc/gcc.info.Optimize_Options.html. > > I am about to build a new kernel am starting to dig a bit deeper into things > I > have, until now, taken for granted. > > The above link is very informative in technical terms about how to control > optimization but I find it difficult to interpret the info in a way that > tells > me what might work best on my own system (Intel quad Core) with 8G of ram.
The build system takes care of that, once you have set the correct CPUTYPE in /etc/make.conf. For a quad-core, set CPUTYPE=nocona. See make.conf(5), /usr/src/share/mk/bsd.cpu.mk and /usr/src/sys/conf/kern.pre.mk. Additionally, compiler settings for building the kernel can be set with COPTFLAGS in /etc/make.conf. Using anything other than -O or -O2 is not guaranteed to work. If you don't know what you are doing, do not use COPTFLAGS and stick with the defaults that the build system generates. Roland -- R.F.Smith http://www.xs4all.nl/~rsmith/ [plain text _non-HTML_ PGP/GnuPG encrypted/signed email much appreciated] pgp: 1A2B 477F 9970 BA3C 2914 B7CE 1277 EFB0 C321 A725 (KeyID: C321A725)
pgpeDZQkhccvL.pgp
Description: PGP signature
