From owner-freebsd-current@FreeBSD.ORG Wed Feb 29 09:50:00 2012 Return-Path: Delivered-To: freebsd-current@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id B4E6D106566B; Wed, 29 Feb 2012 09:49:59 +0000 (UTC) (envelope-from avg@FreeBSD.org) Received: from citadel.icyb.net.ua (citadel.icyb.net.ua [212.40.38.140]) by mx1.freebsd.org (Postfix) with ESMTP id C614A8FC13; Wed, 29 Feb 2012 09:49:58 +0000 (UTC) Received: from porto.starpoint.kiev.ua (porto-e.starpoint.kiev.ua [212.40.38.100]) by citadel.icyb.net.ua (8.8.8p3/ICyb-2.3exp) with ESMTP id LAA14726; Wed, 29 Feb 2012 11:49:42 +0200 (EET) (envelope-from avg@FreeBSD.org) Received: from localhost ([127.0.0.1]) by porto.starpoint.kiev.ua with esmtp (Exim 4.34 (FreeBSD)) id 1S2gAH-0008rZ-Tx; Wed, 29 Feb 2012 11:49:41 +0200 Message-ID: <4F4DF4BD.4040208@FreeBSD.org> Date: Wed, 29 Feb 2012 11:49:49 +0200 From: Andriy Gapon User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:10.0.2) Gecko/20120218 Thunderbird/10.0.2 MIME-Version: 1.0 To: Kevin Oberman References: <4F26CC5A.2070501@FreeBSD.org> <4F4B5ED3.5090508@FreeBSD.org> <65B1891F-9079-4948-BF37-8A50B4E85071@samsco.org> <4F4C0600.2000903@FreeBSD.org> <3BA1B476-ED05-4E8E-8DFA-0B06EFB48867@samsco.org> In-Reply-To: X-Enigmail-Version: 1.3.5 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: FreeBSD current , John Baldwin Subject: Re: revisiting tunables under Safe Mode menu option X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 29 Feb 2012 09:50:00 -0000 on 29/02/2012 00:18 Kevin Oberman said the following: > APIC is required for SMP, but works on many older, single CPU systems > and removes the massive sharing of IRQs common on non-APIC systems. > > OTOH, some ThinkPads simply won't boot with APIC. My old T43 > (Pentium-M) had this issue. I had to turn off APIC to get a GENERIC > kernel to boot. I think that I have heard of other systems that have > an issue with FreeBSD APIC. (APIC seems to work fine with Windows, so > it's something about the FreeBSD implementation, but the problem is > pretty rare, seems limited to 3-5 year old uniprocessor systems, so > it's probably not worth trying to track down. I think that it would be useful to track this down. If it's a bug then it's a bug and who knows how it can bite in the future. If you still have the hardware and can allocate some time to this issue, then it would be great. Also, when you said "disabled APIC" - did you disable it via BIOS settings or via the FreeBSD tunable? BTW, a nitpick - T43 production seems to have started in April 2005, so it's more like 7 years :) -- Andriy Gapon