From owner-freebsd-current@FreeBSD.ORG Wed May 31 03:21:38 2006 Return-Path: X-Original-To: freebsd-current@freebsd.org Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 0CB5316AA13 for ; Wed, 31 May 2006 03:21:38 +0000 (UTC) (envelope-from nate@root.org) Received: from ylpvm12.prodigy.net (ylpvm12-ext.prodigy.net [207.115.57.43]) by mx1.FreeBSD.org (Postfix) with ESMTP id 8400743D58 for ; Wed, 31 May 2006 03:21:37 +0000 (GMT) (envelope-from nate@root.org) Received: from pimout6-ext.prodigy.net (pimout6-int.prodigy.net [207.115.4.22]) by ylpvm12.prodigy.net (8.12.10 outbound/8.12.10) with ESMTP id k4V3LWuk003574 for ; Tue, 30 May 2006 23:21:32 -0400 X-ORBL: [71.139.110.14] Received: from [10.0.5.50] (ppp-71-139-110-14.dsl.snfc21.pacbell.net [71.139.110.14]) by pimout6-ext.prodigy.net (8.13.6 out.dk/8.13.6) with ESMTP id k4V3LWd8178762; Tue, 30 May 2006 23:21:34 -0400 Message-ID: <447D0B5C.3020901@root.org> Date: Tue, 30 May 2006 20:19:56 -0700 From: Nate Lawson User-Agent: Thunderbird 1.5.0.2 (Windows/20060308) MIME-Version: 1.0 To: Andriy Gapon References: <1148837064.00534930.1148826605@10.7.7.3> <1148945069.00535906.1148934001@10.7.7.3> <447C1BBD.5020004@icyb.net.ua> In-Reply-To: <447C1BBD.5020004@icyb.net.ua> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: freebsd-current@freebsd.org Subject: Re: Freeze due to performance_cx_lowest=LOW 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, 31 May 2006 03:21:38 -0000 Andriy Gapon wrote: > on 29/05/2006 23:10 Nate Lawson said the following: >> disable apic (hint.apic.0.disabled="1"). I isolated this a little while >> ago to the change to enable LAPIC timer. However, there is currently no >> easy way to disable the LAPIC timer with APIC enabled so you have to >> disable APIC. jhb@ and I have been discussing how to do this better but >> no easy answers apparently. > > I am not sure what I am talking about, but is it potentially possible to > drive timer system by more than one clock, actively using the most > precise of them at any particular moment ? So that if LAPIC timer stops > i8254 can be used instead. That requires mixed mode delivery -- i8254 on legacy PIC irq and APIC mode for other interrupts. jhb@ just killed this and isn't eager to add it back. I'll let him explain if he has more to add. -- Nate