From owner-freebsd-current@FreeBSD.ORG Thu May 27 05:32:01 2004 Return-Path: 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 4C8F916A4CE for ; Thu, 27 May 2004 05:32:01 -0700 (PDT) Received: from pinus.cc.fer.hr (pinus.cc.fer.hr [161.53.73.18]) by mx1.FreeBSD.org (Postfix) with ESMTP id 72DC743D2F for ; Thu, 27 May 2004 05:32:00 -0700 (PDT) (envelope-from ivoras@fer.hr) Received: from fer.hr (lara.cc.fer.hr [161.53.72.113]) by pinus.cc.fer.hr (8.12.2/8.12.2) with ESMTP id i4RCWRsM015258; Thu, 27 May 2004 14:32:29 +0200 (MEST) Message-ID: <40B5DE26.4040901@fer.hr> Date: Thu, 27 May 2004 14:25:10 +0200 From: Ivan Voras User-Agent: Mozilla Thunderbird 0.5 (Windows/20040207) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Bruce Evans References: <40B4ECC8.50808@fer.hr> <20040526202849.GA37162@freebie.xs4all.nl> <40B519DA.7000708@fer.hr> <20040527120819.B8434@gamplex.bde.org> In-Reply-To: <20040527120819.B8434@gamplex.bde.org> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit cc: current@freebsd.org Subject: Re: Softupdates a mount option? X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 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, 27 May 2004 12:32:01 -0000 Bruce Evans wrote: > On Thu, 27 May 2004, Ivan Voras wrote: > > >>- I was creating a md drive with mdmfs, and it felt rather awkward to >>control softupdates via command line parameters (a sidequestion: does it >>make any sense enabling SU on a memory drive by default?). As it seems >>now, every such utility that handles (well, at least creates) a ffs >>filesystem must handle SU-controlling options as command line parameters. > > > It makes sense to never enable soft updates on a memory drive, since soft > updates uses extra CPU cycles to try to speed up i/o to real drives (and Then maybe the default should be changed? From 'man mdmfs': By default, mdmfs creates a swap-based (MD_SWAP) disk with soft-updates enabled and mounts it on mount-point. > lately it doesn't seem to be very successful in doing the latter -- here > it is now about the same speed as normal mounts for copying /usr/src but > was 1.5 times faster a few years ago; async mounts are still 2.5 times > faster). Yup, I noticed :( *sigh* -- Every sufficiently advanced magic is indistinguishable from technology - Arthur C Anticlarke