Date: Sat, 18 Aug 2001 18:47:34 -0400 (EDT) From: Kenneth W Cochran <kwc@world.std.com> To: Mike Smith <msmith@freebsd.org> Cc: freebsd-stable@freebsd.org Subject: Re: New kernel option CPU_ENABLE_SSE Message-ID: <200108182247.SAA09198@world.std.com>
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>To: Kris Kennaway <kris@obsecurity.org> >cc: Kenneth W Cochran <kwc@world.std.com>, freebsd-stable@FreeBSD.ORG >Subject: Re: New kernel option CPU_ENABLE_SSE > >> --R+My9LyyhiUvIEro >> Content-Type: text/plain; charset=us-ascii >> Content-Disposition: inline >> >> 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. > >So detect it automatically based on the CPU feature bits. > >Needing a kernel compile option for this is unforgivably lame. If you >want to be able to disable it, use a tunable. Perhaps; the "gist" I get is that the compile option is for some "field-testing." Maybe similarly appropriate would be something similar to "NO_F00F_HACK"; for example, "CPU_DISABLE_SSE" or "CPU_NO_ENABLE_SSE" (?). Just thinking out loud; the current method is ok with me. :) -kc To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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