From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from sc8-sf-mx1-b.sourceforge.net ([10.3.1.11] helo=sc8-sf-mx1.sourceforge.net) by sc8-sf-list1.sourceforge.net with esmtp (Exim 4.30) id 1BBXK4-0003gR-41 for user-mode-linux-devel@lists.sourceforge.net; Thu, 08 Apr 2004 04:03:52 -0700 Received: from [12.177.129.25] (helo=ccure.user-mode-linux.org) by sc8-sf-mx1.sourceforge.net with esmtp (TLSv1:DES-CBC3-SHA:168) (Exim 4.30) id 1BBXK3-0003wU-Lk for user-mode-linux-devel@lists.sourceforge.net; Thu, 08 Apr 2004 04:03:51 -0700 Message-Id: <200404081141.i38BfdB6001907@ccure.user-mode-linux.org> Subject: Re: [uml-devel] A quick humfs HOWTO In-Reply-To: Your message of "Thu, 08 Apr 2004 12:07:38 +0200." References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii From: Jeff Dike Sender: user-mode-linux-devel-admin@lists.sourceforge.net Errors-To: user-mode-linux-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Id: The user-mode Linux development list List-Post: List-Help: List-Subscribe: , List-Archive: Date: Thu, 08 Apr 2004 07:41:39 -0400 To: Henrik Nordstrom Cc: Nick Craig-Wood , user-mode-linux-devel@lists.sourceforge.net uml@henrik.marasystems.com said: > Eh? Why a loop mounted filesystem for humfs? The whole point of humfs > is to be able to emulate full UNIX semantics including ownership, > permissions, filesystem size etc ontop of a plain file tree without > requiring root on the host.. humfs was done now because it's the only way to get the memory savings offered by doing mmap IO. It turns out that some people need block devices because they repartition their UMLs, run RAID, etc. Loop-mounting a disk image located on a humfs filesystem gives you both. So, it's more than a transitional thing. > If you want performance then ubd devices is the path to go. That's currently the case (a humfs boot is noticably slower than a ubd boot), but it's not clear why that should be the case. There is less code running inside UML (no block layer or block driver), and it's not obvious to me that putting stuff in files in a host directory should be slower than having it in a disk image. Jeff ------------------------------------------------------- This SF.Net email is sponsored by: IBM Linux Tutorials Free Linux tutorial presented by Daniel Robbins, President and CEO of GenToo technologies. Learn everything from fundamentals to system administration.http://ads.osdn.com/?ad_id=1470&alloc_id=3638&op=click _______________________________________________ User-mode-linux-devel mailing list User-mode-linux-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel