Date: Thu, 16 Aug 2001 18:00:40 -0400 (EDT) From: Kenneth W Cochran <kwc@world.std.com> To: Kris Kennaway <kris@obsecurity.org> Cc: freebsd-stable@freebsd.org Subject: Re: New kernel option CPU_ENABLE_SSE Message-ID: <200108162200.SAA21031@world.std.com> References: <200108162020.QAA14274@world.std.com>
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Ok, so how can I tell if a given CPU supports that feature? I see a "feature list" in the kernel startup, and in the case of a Pentium-III, SSE is at the "end" of that list; is that the Definitive Indicator? If so, what's to keep the kernel from detecting and enabling it (per config-option, for example)? (kernel complexity, for example...) Am I correct in assuming that "older generation" 686 CPUs (i.e. pre-Pentium-III) don't support SSE & that SSE is a function/enhancement of "newer generation" CPUs? -kc >Date: Thu, 16 Aug 2001 14:28:44 -0700 >From: Kris Kennaway <kris@obsecurity.org> >To: Kenneth W Cochran <kwc@world.std.com> >Cc: freebsd-stable@FreeBSD.ORG >Subject: Re: New kernel option CPU_ENABLE_SSE > >On Thu, Aug 16, 2001 at 04:20:35PM -0400, Kenneth W Cochran wrote: >> Assuming CPU_ENABLE_SSE is a Good Thing, why not make it >> "default" with the "cpu I686_CPU" kernel config directive >> (similar to F00F_HACK auto-include with I586_CPU)? > >Because not all i686'es support SSE. > >Kris To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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