Date: Mon, 15 Jan 2007 12:38:03 -0800 From: Garrett Cooper <youshi10@u.washington.edu> To: freebsd-questions@freebsd.org Subject: Re: FreeBSD 6.2, rebuild. NO-MMX, NO-SSE? Message-ID: <45ABE62B.2080108@u.washington.edu> In-Reply-To: <200701152052.05269.daniel.tourde@spray.se> References: <200701152052.05269.daniel.tourde@spray.se>
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Daniel Tourde wrote: > Hello, > > Yesterday I rebuit FreeBSD 6.2 using CPUTYPE=pentium4 and the classic > procedure described in the manual. > The machine (Inspiron 9400) is fast but I saw at certain moments something > like "NO-MMX, NO-SSE" (some flags or variables) during the compilation > process. I thought then "How come? What a pity not to use these > instructions". > > Can someone tell me what it was and if it is really supposed to be like this? > My roots are in Gentoo Linux where it is possible to get the maximum out of a > processor when building a system from scratch by using properly certain C and > C++ flags. > > I am pretty sure the same is possible with FreeBSD, however these > aforementionned flags raised some questions in my mind... ;) > > > Daniel Certain optimizations aren't built into any kernel--be it Linux or FreeBSD--as the optimizations may break the kernel compilation process. You just don't see the majority of those messages flying by in a Linux kernel compile ;). As a fellow former-Gentoo user I suggest you also read these threads: http://lists.freebsd.org/pipermail/freebsd-hackers/2006-December/018966.html http://lists.freebsd.org/pipermail/freebsd-questions/2007-January/139260.html Cheers, -Garrett
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