From owner-freebsd-stable Fri Aug 17 7:16:22 2001 Delivered-To: freebsd-stable@freebsd.org Received: from salmon.maths.tcd.ie (salmon.maths.tcd.ie [134.226.81.11]) by hub.freebsd.org (Postfix) with SMTP id 3726837B406 for ; Fri, 17 Aug 2001 07:16:19 -0700 (PDT) (envelope-from dwmalone@maths.tcd.ie) Received: from walton.maths.tcd.ie by salmon.maths.tcd.ie with SMTP id ; 17 Aug 2001 15:16:18 +0100 (BST) Date: Fri, 17 Aug 2001 15:16:18 +0100 From: David Malone To: Kris Kennaway Cc: Kenneth W Cochran , freebsd-stable@freebsd.org Subject: Re: New kernel option CPU_ENABLE_SSE Message-ID: <20010817151618.A42616@walton.maths.tcd.ie> References: <200108162020.QAA14274@world.std.com> <200108162200.SAA21031@world.std.com> <20010816150345.A79841@xor.obsecurity.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: <20010816150345.A79841@xor.obsecurity.org>; from kris@obsecurity.org on Thu, Aug 16, 2001 at 03:03:45PM -0700 Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG 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