Date: Mon, 20 Sep 2004 14:30:39 -0400 From: John Baldwin <jhb@FreeBSD.org> To: freebsd-amd64@FreeBSD.org Cc: re@FreeBSD.org Subject: Re: NO_MIXED_MODE Message-ID: <200409201430.39304.jhb@FreeBSD.org> In-Reply-To: <414DEE9B.3020800@samsco.org> References: <xzpllf7gfxo.fsf@dwp.des.no> <20040919135233.4997ea78@dolphin.local.net> <414DEE9B.3020800@samsco.org>
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On Sunday 19 September 2004 04:39 pm, Scott Long wrote: > Conrad J. Sabatier wrote: > > On Sun, 19 Sep 2004 04:17:55 +0200, des@des.no (Dag-Erling Sm=F8rgrav) > > > > wrote: > >>I just got an ASUS SK8N motherboard that has the problematic nForce 3 > >>chipset. It runs 5.3 BETA4 fine, except you have to boot it in safe > >>mode because the APIC only works properly in mixed mode, and GENERIC > >>has the NO_MIXED_MODE option. Took me quite a while to figure that > >>out... > >> > >>Should we consider removing that option for 5.3-RELEASE? > > > > I'll second that motion. I have the same chipset, and the same problem > > with NO_MIXED_MODE. I think we should err on the side of caution with > > this one. > > Let's see what Peter, David, and John say about this. My understanding > is that mixed mode has a measurable performance impact, so we don't want > to turn it on universally unless neccessary. Maybe David knows of a > BIOS upgrade that would help your motherboards. You can toggle mixed mode via a loader tunable. I'd add a note to the=20 hardware notes suggesting that people with the specific motherboard break=20 into the loader during install and do: set hw.apic.mixed_mode=3D1 and then add an appropriate line to /boot/loader.conf after install. =2D-=20 John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" =3D http://www.FreeBSD.org
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