Date: Tue, 16 Jan 2007 21:15:43 -0600 From: "Nikolas Britton" <nikolas.britton@gmail.com> To: "Tsu-Fan Cheng" <tfcheng@gmail.com> Cc: FreeBSD <freebsd-questions@freebsd.org> Subject: Re: duo core question Message-ID: <ef10de9a0701161915x71c9dd43g13021407ddcba3e5@mail.gmail.com> In-Reply-To: <f84c38580701161711w323647c2n3e9c72b604eed49@mail.gmail.com> References: <f84c38580701161711w323647c2n3e9c72b604eed49@mail.gmail.com>
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On 1/16/07, Tsu-Fan Cheng <tfcheng@gmail.com> wrote: > hi, > just chat here... how much faster will a duo core CPU gives me when > running freebsd, nothing optimised.. > 1. You need to rebuild the kernel with SMP support. 2. The correct names are; Core Duo, Core 2 Duo, Core Solo, and Core 2 Solo. 3. Add this to /etc/make.conf: CPUTYPE?=pentium3 CFLAGS+= -mtune=prescott COPTFLAGS+= -mtune=prescott * Change prescott to nocona if you have a Core 2 chip, although it doesn't really matter, EM64T support is ignored with FreeBSD/i386 and it's on by default with FreeBSD/AMD64. Moreover it's only being used with -mtune which means it does not change the ABI or the set of available instructions.... Those two are set via CPUTYPE and -march=cpu-type... don't set CPUTYPE or -march higher then pentium3 because higher settings have been known to screw up stuff at compile time.
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