From owner-freebsd-current@FreeBSD.ORG Thu Jun 1 21:33:30 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 AEF3716BB48 for ; Thu, 1 Jun 2006 21:33:30 +0000 (UTC) (envelope-from keramida@ceid.upatras.gr) Received: from igloo.linux.gr (igloo.linux.gr [62.1.205.36]) by mx1.FreeBSD.org (Postfix) with ESMTP id DAA1443D45 for ; Thu, 1 Jun 2006 21:33:28 +0000 (GMT) (envelope-from keramida@ceid.upatras.gr) Received: from gothmog.pc (host5.bedc.ondsl.gr [62.103.39.229]) (authenticated bits=128) by igloo.linux.gr (8.13.6/8.13.6/Debian-1) with ESMTP id k51LXE5n007387 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT); Fri, 2 Jun 2006 00:33:18 +0300 Received: from gothmog.pc (gothmog [127.0.0.1]) by gothmog.pc (8.13.6/8.13.6) with ESMTP id k51LZRxx053467; Fri, 2 Jun 2006 00:35:27 +0300 (EEST) (envelope-from keramida@ceid.upatras.gr) Received: (from giorgos@localhost) by gothmog.pc (8.13.6/8.13.6/Submit) id k51LZRR7053466; Fri, 2 Jun 2006 00:35:27 +0300 (EEST) (envelope-from keramida@ceid.upatras.gr) Date: Fri, 2 Jun 2006 00:35:27 +0300 From: Giorgos Keramidas To: Kris Kennaway Message-ID: <20060601213527.GA53422@gothmog.pc> References: <20060522211223.GA3621@xor.obsecurity.org> <20060522231437.GC1446@odin.ac.hmc.edu> <20060523133037.GA2908@gothmog.pc> <20060523143013.GA11472@ci0.org> <20060523194106.GA46634@xor.obsecurity.org> <20060524203645.GB13500@gothmog.pc> <20060524203747.GA88742@xor.obsecurity.org> <20060524204617.GA13701@gothmog.pc> <20060601002024.GA1453@gothmog.pc> <20060601210655.GA36389@xor.obsecurity.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20060601210655.GA36389@xor.obsecurity.org> X-Hellug-MailScanner: Found to be clean X-Hellug-MailScanner-SpamCheck: not spam, SpamAssassin (score=-3.409, required 5, autolearn=not spam, ALL_TRUSTED -1.80, AWL 0.79, BAYES_00 -2.60, DNS_FROM_RFC_ABUSE 0.20) X-Hellug-MailScanner-From: keramida@ceid.upatras.gr X-Spam-Status: No Cc: freebsd-current@freebsd.org Subject: Re: md /tmp and async mounts 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: Thu, 01 Jun 2006 21:33:36 -0000 On 2006-06-01 17:06, Kris Kennaway wrote: > On Thu, Jun 01, 2006 at 03:20:24AM +0300, Giorgos Keramidas wrote: > > [diff snipped] > > Thanks for the patch. > > > This doesn't make 'async' the default for all mdmfs mounts. > > > > Making async the default for mdmfs-based filesystems would > > require a fair bit of changes to mdmfs, which would have to grow > > mount-option parsing capabilities for the `optarg' of the -o > > option and make sure that async is always added, unless mdmfs is > > called explicitly with `noasync' in its -o option. > > > > Having said this, if this is considered a change we should make, > > I can prepare a patch for mdmfs too. > > I think it should be the default. I think we should also avoid using > -M (malloc backing for md) in favour of swap backing because of the > panic problems - this is too easy to trigger by accident and it makes > FreeBSD look bad since it looks like a bug. Ok, I'll prepare a patch that enables async and disables -M. We should also document the fact that tmpmfs="YES" and varmfs="YES" in rc.conf may require the presence of at least one swap device by default, and point the users to -M with a warning if they run FreeBSD without a swap device but still want to use tmpmfs or varmfs :)