Date: Fri, 17 Aug 2001 15:16:18 +0100 From: David Malone <dwmalone@maths.tcd.ie> 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 Message-ID: <20010817151618.A42616@walton.maths.tcd.ie> In-Reply-To: <20010816150345.A79841@xor.obsecurity.org>; from kris@obsecurity.org on Thu, Aug 16, 2001 at 03:03:45PM -0700 References: <200108162020.QAA14274@world.std.com> <200108162200.SAA21031@world.std.com> <20010816150345.A79841@xor.obsecurity.org>
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On Thu, Aug 16, 2001 at 03:03:45PM -0700, Kris Kennaway wrote: > On Thu, Aug 16, 2001 at 06:00:40PM -0400, Kenneth W Cochran wrote: > > 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...) > > Yeah, it could probably be done that way. I think it is actually done that way, but it's not turned on by default just for the sake of being conservative. The code to support SSE in -stable is different to that in -current so I'd guess Peter is being cautious until it's got some more testing. David. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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