From owner-freebsd-current@FreeBSD.ORG Mon Jan 30 17:34:15 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 E59971065677 for ; Mon, 30 Jan 2012 17:34:15 +0000 (UTC) (envelope-from nwhitehorn@freebsd.org) Received: from adsum.doit.wisc.edu (adsum.doit.wisc.edu [144.92.197.210]) by mx1.freebsd.org (Postfix) with ESMTP id B81198FC25 for ; Mon, 30 Jan 2012 17:34:15 +0000 (UTC) MIME-version: 1.0 Content-transfer-encoding: 7BIT Content-type: text/plain; CHARSET=US-ASCII; format=flowed; delsp=yes Received: from avs-daemon.smtpauth1.wiscmail.wisc.edu by smtpauth1.wiscmail.wisc.edu (Sun Java(tm) System Messaging Server 7u2-7.05 32bit (built Jul 30 2009)) id <0LYM00H0GGT3FN00@smtpauth1.wiscmail.wisc.edu>; Mon, 30 Jan 2012 11:34:15 -0600 (CST) Received: from [10.0.2.94] (adsl-76-208-68-223.dsl.mdsnwi.sbcglobal.net [76.208.68.223]) by smtpauth1.wiscmail.wisc.edu (Sun Java(tm) System Messaging Server 7u2-7.05 32bit (built Jul 30 2009)) with ESMTPSA id <0LYM00250GSV7X50@smtpauth1.wiscmail.wisc.edu>; Mon, 30 Jan 2012 11:34:08 -0600 (CST) Date: Mon, 30 Jan 2012 11:34:06 -0600 From: Nathan Whitehorn In-reply-to: <1327944631.1686.24.camel@revolution.hippie.lan> To: Ian Lepore Message-id: <864493F7-CAAA-4363-891D-9E2ACF90827C@freebsd.org> X-Mailer: Apple Mail (2.936) X-Spam-Report: AuthenticatedSender=yes, SenderIP=10.0.2.94 X-Spam-PmxInfo: Server=avs-12, Version=5.6.1.2065439, Antispam-Engine: 2.7.2.376379, Antispam-Data: 2012.1.30.172119, SenderIP=10.0.2.94 References: <4F26CC5A.2070501@FreeBSD.org> <1327944631.1686.24.camel@revolution.hippie.lan> Cc: freebsd-current@freebsd.org, Andriy Gapon 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: Mon, 30 Jan 2012 17:34:16 -0000 On Jan 30, 2012, at 11:30 AM, Ian Lepore wrote: > On Mon, 2012-01-30 at 18:59 +0200, Andriy Gapon wrote: >> >> o hw.ata.ata_dma, hw.ata.atapi_dma - I am not sure if there have >> been any >> significant problems with ATA DMA recently. Maybe these could be >> removed? > > I still have to work with hardware that requires ata_dma disabled. It > seems to be required for most systems I've worked with that have a > compact flash socket on the mainboard (sometimes you can just limit > the > mode to udma33 or less, sometimes you have to turn it off completely.) > > Adding kern.eventtimer.periodic=1 seems like a good idea. > > As a general philosophical thing, I don't have a problem with the idea > "safe mode turns off everything that has ever historically been > problematic," because I don't think anyone expects a system to run > well > in safe mode. I see it more as a tool to start narrowing down the > area > of trouble, like step 1 of a binary search for the problem. As such, > the most important aspect is a comprehensive list of what changes for > safe mode, so that you can procede by selectively en/disabling the > various things it does. I second the point about ATA DMA, but it is worth pointing out that those sysctls don't do anything with ATA_CAM (see http://www.freebsd.org/cgi/query-pr.cgi?pr=164226) . -Nathan