On Fri, Nov 10, 2006 at 11:34:22AM -0800, Jason C. Wells wrote: > I have set CPUTYPE=p3 in make.conf. When I compile my kernel I see > -march=pentium3 as I expect. I also see -mno-mmx and -mno-sse are set > which I do not expect given that -march=pentium3 is used. I presume > that I want MMX and SSE since my processor supports it. What options do > I set and where do I set them to get a kernel properly tuned for pentium3?
The kernel will "support" MMX and SSE -- that is, any programs (root or userland) which use MMX/SSE will work just fine. That is: any programs built with gcc can indeed support MMX and SSE operations. The kernel itself _will not_ use any SSE or MMX operations when built. This is because these optimisations are known to break the FreeBSD kernel. This applies to all i386 architectures, and probably 64-bit architectures too (not sure). CPUTYPE=p3 (or pentium4, or any other type) will not change this behaviour. -- | Jeremy Chadwick jdc at parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB | _______________________________________________ [email protected] mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "[EMAIL PROTECTED]"
